Welcome to the
Home Page of
Theodore J. Bornhorst
Emeritus Professor of Geology
Department
of Geological and Mining Engineering and Sciences
Michigan
Technological University
1400
Townsend Drive
Houghton,
MI 49931
Dr.
Bornhorst is an Emeritus Professor of Geology at Michigan Tech. He was employed
at Michigan Tech for 40 years. Most recently he was Executive Director and
Interim Curator of the A.E. Seaman Mineral Museum of Michigan Tech as well as
Professor of Geology. In his administrative role at the museum from 2003 to
2020 he was responsible for all aspects of the museum. Bornhorst was the museum
leader in the relocation of the museum from its previous main campus location
of 35 years to its current location into a newly constructed dedicated facility
including a main museum building, mineral preparation annex, Phyllis and John
Seaman garden, and copper pavilion. He was the Michigan Tech representative and
the key person in negotiation of the Michigan Mineral Alliance, a unique
agreement between Michigan Tech and the University of Michigan to preserve the
legacy of the University of Michigan mineral collection, which now resides at
the A. E. Seaman Mineral Museum. The alliance was highlighted in the journal
Nature.
Prior
to and during his administrative appointment in the museum, Bornhorst was a
faculty member in the Department of Geological and Mining Engineering and
Sciences engaged in teaching and research. His teaching responsibilities from
1980 to 2017 included: 35 years teaching various courses on metallic mineral
deposits and exploration, 24 years teaching petrology, 32 years teaching field
geology with engineering applications, and 3 years teaching mineralogy. He has
also taught advanced courses in geochemistry, petrology, and mineral deposits.
His research and that of the students he supervised have covered a breath of
topics but with more emphasis on aspects of metallic mineral deposits, the
geology and mineral resources of the Upper Peninsula of Michigan, geology and
mineral resources in Finland, as well as topics involving environment,
groundwater, and K-12 education. He has recently published articles on the
genesis of native copper deposits of the Keweenaw Peninsula, the first
published geologic description of the Copperwood sedimentary rock-hosted stratiform copper
deposit, in the western Upper Peninsula, and an article in the
international journal Economic Geology on humidity
cell testing of for predicting future water-quality impacts from metallic mining. He
was awarded the prestigious Goldich Medal in 2008 from the Institute on Lake
Superior Geology for outstanding contributions to Lake Superior geology. Beginning
in 2019, Bornhorst is the mineral deposits section Editor-in-Chief of the open
access journal Minerals (https://www.mdpi.com/journal/minerals/editors).
EDUCATION
Ph.D.
- 1980 - Geology -
M.S.
- 1976 - Geology - University of New Mexico
B.S.
- 1974 (with high honor) - Geology -
AWARDS
Goldich Medal 2008 from the
Institute on Lake Superior Geology for outstanding contributions to Lake
Superior geology
Commendation from Michigan
Governor Granholm for service to the State of Michigan in helping enact
Michigan's landmark Sulfide Mining Act, Public Act 449 of 2004.
Geoscience
Information Society Best Guidebook Award for 1995
PROFESSIONAL EXPERIENCE
Professor Emeritus, Department of Geological
and Mining Engineering and Sciences, Michigan Technological University,
Houghton, Michigan (September 2020 present).
Professor with tenure, Department of
Geological and Mining Engineering and Sciences, Michigan Technological University,
Houghton, Michigan (September 1993 to 2020).
Executive Director and Interim Curator, A. E.
Seaman Mineral Museum, Michigan Technological University, Houghton, Michigan
(2019 to 2020
Executive Director, A.
Director, A.
Special
Assistant to the Dean of Engineering (2003 to 2007)
Chair, Department of Geological and Mining
Engineering and Sciences, Michigan Technological University, Houghton, Michigan
(1998 to 2003)
Adjunct
Professor, Department of Education, Michigan Technological University,
Houghton, Michigan (1996 to 2014)
Associate Professor with tenure, Department
of Geological Engineering, Geology and Geophysics, Michigan Technological
University, Houghton, Michigan (1986 to 1993)
Visiting
Associate Professor, Geological Survey of Finland, Espoo (1991)
Assistant Professor, Department of Geology
and Geological Engineering, Michigan Technological University, Houghton,
Michigan (1981 to 1986).
Visiting Scientist, Mt. St. Helens Volcano
Observatory, U.S.Geological Survey, Vancouver, Washington (1980)
Post-Doctoral Research Associate and Visiting
Assistant Professor, Department of Geology and Geological Engineering, Michigan
Technological University, Houghton, Michigan (1980 to 1981)
Visiting Staff Member, Chemistry-Nuclear
Chemistry Group, Los Alamos Scientific Laboratory, Los Alamos, New Mexico (1977
to 1980)
Paid Consulting Activities: Marquette University, PolyMet Mining Corp. via Foth, Keweenaw Land Association, Orvana Resources Corp, Highland UPX, Phelps Dodge Exploration Corporation, Bell Resources Corporation, Grandcru Resources Corporation, Steigerwaldt Land Services, International Paper, Peninsula Copper Industry, Red Metal Minerals, Copper Range Company, Michigan Low Level Radioactive Waste Authority, Callahan Mining Corporation, Battelle Memorial Institute, ARCO Exploration and Technology Group, Michigan Geological Survey, Amselco Exploration, Camden, South Carolina, Hanna Mining Company, Los Alamos Scientific Laboratory, Kennecott Exploration, Michigan Nature Association, Township of Eagle Harbor Michigan, Keweenaw Land Trust, The Nature Conservancy.
LICENSED
PROFESSIONAL GEOLOGIST
State of Minnesota,
Minnesota Board of Architecture, Engineering, Land Surveying (License Number
30247).
APPOINTMENTS
Mineral
Deposits Section Editor-in-Chief of the open access journal Minerals published
by Multidisciplinary Digital Publishing Institute (MDPI) (2019 to present)
Mineral
Wells Advisory Committee of the Michigan Department of Environmental Quality
(2001 to present), Vice Chair (2006 to ~2010).
Invited to be on the
Community Advisory Group for Kennecott Eagle Project (2007
to 2008).
Charter
Board Member of the Northern Michigan Geologic Repository Association (NMGRA)
(2008-~2012)
Appointed to Work Group
on Administrative Rules for Michigan's
Nonferrous Metallic Mining Regulations, Part 632, Natural
Resources and Environmental Protection Act, Act No. 451 of the Public Acts of
1994, as amended. (2005 to 2006);
Only academic member.
Appointed to the Work Group on Regulation of
Metallic Mineral Exploration and Mining in the State of Michigan. Appointed by
the Director of the Michigan Department of Environmental Quality Director March
24, 2004. State of Michigan law which was passed by the Michigan Legislature
and signed into law December 27, 2004 as Part 632, Natural Resources and
Environmental Protection Act, Act No. 451 of the Public Acts of 1994, as
amended; Only academic member.
Appointed to the Work
Group on Metallic Mineral Leasing of State of Michigan Mineral Rights. (March
to August, 2004). Only academic member.
Appointed
to the Board of Governors of Michigan's Low-Level Radioactive Waste Research
and Education Institute. The Board of Governors was convened in accordance with
1995 amendments to Section 17 (13) of Michigan Public Act 204. Appointed by
Commissioner of the Michigan Low-Level Radioactive Waste Authority. Term of
Appointment
Appointed
as Chairperson of the Siting Criteria Advisory Committee for Michigan's Low
Level Radioactive Waste Authority. The committee was mandated by the Michigan
legislature, Public Act 204, 1987. Appointment by Commissioner and Head of the
Authority, David Hales; Chairperson - January 1988 to May, 1989.
Appointed
to the Board of Governors of the International Low-Level Radioactive Waste Research
and Education Institute. The institute was created by section 17 of Michigan
Public Act 204 of 1987 and operated by a consortium from the University of
Michigan and Michigan State University. Appointment by Michigan Low-Level
Radioactive Waste Authority, University of Michigan, and Michigan State
University. Term of Appointment
Appointed
by Governor Blanchard, State of Michigan to the Radioactive Waste Control
Committee legislated by Michigan Public Act 190 of 1985; term of appointment
March 7, 1986 to April 15, 1988 (committee disbanded upon creation of the
Low-level Radioactive Waste Authority).
Appointment
confirmed by Governor Blanchard, State of Michigan, to Governor's Task Force on
High-Level Radioactive Waste; Member July 1983 to April 1986 (committee
disbanded when DOE ended search for crystalline rock site).
Appointed
by Governor Blanchard's Office to be one of three state representatives at the
Department of Energy's "States Weighting Workshop", Crystalline Rock
Project held at Battelle Memorial Institute, Columbus, Ohio, May 20-22, 1985.
PROFESSIONAL SOCIETIES
Fellow
Geological Society of America
Fellow
Society of Economic Geologists
Fellow
Geological Association of
Member
American Geophysical
Member
Institute on
SERVICE TO PROFESSIONAL ORGANIZATIONS
Co-Chair,
Institute on Lake Superior Geology, 2017.
Principal
Co-Chair, Board of Directors, Institute on Lake Superior Geology, 2008
Board
of Directors, Institute on Lake Superior Geology, 2008-2011
Presenter
and Organizer
Short Course for 44th Annual
Meeting of the American Institute of Professional Geologists held in Traverse
City, MI; Exploration for and Mining of Metals with Emphasis on Michigan Upper
Peninsula (8 hours of presentations and discussion), 2007
Principal
Co-Chair, Board of Directors, Institute on Lake Superior Geology, 1999
Board of Directors, Institute on
Executive Committee
(1999-2001), U.S. Heads and Chairs of Earth and Space Science Departments
within American Geophysical Union (Chair through October, 2000, Past Chair and
member until October 2001) organized two day meeting held in Washington DC
October 19 and 20, 2000 attended by about 50 department heads/chairs from
across the U.S
Society
of Economic Geologists, Short Course Committee, 1996-1999
Associate
Secretary Treasurer, Institute on Lake Superior Geology, 1994-1999
Chair,
Board of Directors, Institute on Lake Superior Geology, 1994
Board
of Directors, Institute on Lake Superior Geology, 1994-1998
Principal
Organizer of Society of Economic Geologists Field Conference, western Upper
Michigan, 1992
Chair,
Board of Directors, Institute on Lake Superior Geology, 1983
Board
of Directors, Institute on Lake Superior Geology, 1983-1987
EDITORSHIP
Bornhorst, T.J., 2018, Geochemistry and Mineralogy
of Hydrothermal Metallic Mineral Deposits: Minerals Special Issue
Bornhorst, T.J. and Hanson,
M.J., editors, 2017, Institute on Lake Superior Geology, Proceedings
Part 2: Field Trip Guidebook, 63rd Annual Meeting, Wawa, Ontario v. 63,
part 2, 204p.
Bornhorst, T.J. and Hanson,
M.J., editors, 2017, Institute on Lake Superior Geology, Proceedings
Part 1: Program and Abstracts, 63rd Annual Meeting, Wawa, Ontario v.
63, part 1, 97p.
Bornhorst, T.J. and Barron, R.J., editors, 2013,
Institute on Lake Superior Geology, Proceedings, Field Trip Guidebook, 59th
Annual Meeting, Houghton, MI v. 59, part 2, 118p.
Blaske, A.R. and Bornhorst, T.J., editors, 2013,
Institute on Lake Superior Geology, Proceedings, Program and Abstracts, 59th
Annual Meeting, Houghton, MI v. 59, part 1, 83p.
Bornhorst, T.J. and Klasner, J.S., editors, 2008, Institute on Lake Superior
Proceedings Volume 54, Field Trip Guidebook, published by Institute on Lake
Superior Geology, St. Paul, MN, v. 54, part 2, 85p.
Bornhorst, T.J. and G.W. Robinson, editors, 2008, Institute on Lake Superior
Proceedings Volume 54, Program and Abstracts, published by Institute on Lake
Superior Geology, St. Paul, MN, v. 54, part 1, 85p.
Woodruff, Laurel and Bornhorst, T.J. editors, 2003, Institute
on Lake Superior Proceedings Volume 49, Program and Abstracts, published by
Institute on Lake Superior Geology, St. Paul, MN, v. 49, part 1, 85p.
Bornhorst, T.J., editor, 1999, Institute on Lake Superior Geology Proceedings Volume
45, Field Trip Guidebook, published by Institute on Lake Superior Geology, St.
Paul,
Regis, R.S., and Bornhorst, T.J., editors, 1999,
Institute on Lake Superior Geology Proceedings Volume 45, Program and
Abstracts, published by Institute on Lake Superior Geology, St. Paul,
Bornhorst,
T.J., editor, 1998, ILSG Newsletter, published by the
Institute on Lake Superior Geology, distribution of 600 copies mostly within
U.S. and Canada with some to Europe, Number 1 published December 1995, Number 2
published December 1996, Number 3 published December 1997, Number 4 published
December 1998.
Bornhorst,
T.J., 1997, Guest Editor for a special issue of the Canadian
Journal of Earth Sciences, Petrology and Metallogeny of Intraplate Mafic and
Ultramafic Magmatism, published April 1997, 238 pages; total of 36 manuscript
reviews.
Bornhorst,
T.J. and McDowell, S.D., editors, 1994, Institute on Lake
Superior Geology Proceedings, Program and Abstracts, 40th Annual Meeting,
Houghton, MI, v. 40, part 1, 84p.
Bornhorst,
T.J., editor, 1992, Keweenawan Copper Deposits of Western
Upper Michigan, Society of Economic Geologists Guidebook Series, v. 13, 197 p.
Bornhorst,
T.J. and Diehl, J.F., co-editors, 1983, Institute on Lake
Superior Geology Proceedings 29th Annual Meeting, Houghton, MI, v. 29, 81 p.
PUBLICATIONS
Bornhorst,
T.J., 2018, Editorial for
Special Issue on Geochemistry and Mineralogy of Hydrothermal Metallic Mineral
Deposits: Minerals 2018, v. 8, p. 251 doi:10.3390/min8060251
Bornhorst,
T.J. and Mathur, R., 2018, Copper Isotope Constraints on the Genesis of the
Keweenaw Peninsula Native Copper District, Michigan, USA: Reply: Minerals, v. 8,
p. 508, 8p. doi:10.3390/min8110508.
Bornhorst,
T.J., 2018, Maximum
depositional age of the Neoproteroaoic Jacobsville Sandstone, Michigan:
Implications for the evolution of the Midcontinent Rift: COMMENT: Geoshpere, v.
14, no. 3, 2p. doi:10.1130/GES01575.1.
Bornhorst,
T.J., Poulsen, C.J., and
Ewing, R.C., 2018, A rescue package for imperilled collection: Nature,
Correspondence, v. 546, p. 210.
Boerboom, T.J., Bornhorst,
T.J., Cannon, W.F.,
Hinze, W.J., Jirsa, M.A., Runkel, A.C., Schulz, K.J., Steenberg, J.R., and
Woodruff, L.G., 2018, Comment on Paleozoic reactivation structures in the
Appalachian-Ouachita-Marthon foreland: Far-field Deformation across Pangea, by
J. Craddock, D. Malone, R. Porter, J. Compton, J. Luczaj, A. Konstantinou, J.
Day, and S. Johnston [Earth Science Reviews 169 (2017), 1-34]: Earth Science
Reviews, v. 181, 144-152. doi.org/10.1016/j.earscirev.2018.02.003.
Bornhorst,
T.J. and Mathur, R., 2017, Copper Isotope Constraints on the Genesis of the
Keweenaw Peninsula Native Copper District, Michigan, USA: Minerals, v. 7, p.
185, 20p. doi:10.3390/min7100185.
Bornhorst,
T.J., and Logsdon, M.J., 2016, Predicting Future
Water-Quality Impacts from Mining: A 52-year Old Field Analog for Humidity Cell
Testing, Copperwood Deposit, Michigan, Economic Geology, v. 111, p. 527-542.
Ikehata, K., Chida, K., Tsunagae,
T., and Bornhorst, T.J., 2016, Hydrothermal Native Copper in
Ocean Island Alkali Basalt from Mineoka Belt, Boso Peninsula, Central Japan:
Economic Geology, v. 111, p. 783-794..
Bornhorst,
T.J. and
Poulsen, C.J., 2015, Michigan Mineral Alliance, Rocks & Minerals, v.
90, p. 450-453.
Bornhorst, T.J. and Williams, W.C., 2013, The
Mesoproterozoic Copperwood Sedimentary Rock-Hosted Stratiform Copper Deposit,
Upper Peninsula, Michigan: Economic Geology, v. 108, p. 1325-1346.
Bornhorst, T.J. and Barron, R.J., 2013, Geologic
Overview of the Keweenaw Peninsula, Michigan Field Trip 1: Institute on Lake
Superior Geology, Field Trip Guidebook, 59th Annual Meeting,
Houghton, MI v. 59, part 2, p. 1-42.
Bornhorst, T.J., Barron, R.J., and Whiteman, R.C.,
2013, Caledonia Mine, Keweenaw Peninsula Native Copper District, Ontonagon
County, Michigan Field Trip 2: Institute on Lake Superior Geology, Field Trip
Guidebook, 59th Annual Meeting, Houghton, MI v. 59, part 2, p.
43-57.
Bornhorst, T.J., Blaske, A., Anderson, D, Repaal, T.D.,
2013, Geology and Environmental Site Conditions of the Copperwood Deposit,
Gogebic County, Michigan Field Trip 6: Institute on Lake Superior Geology,
Field Trip Guidebook, 59th Annual Meeting, Houghton, MI v. 59, part
2, p. 97-118.
Bornhorst,
T.J., and Barron, R.J., 2011, Copper deposits of the
western Upper Peninsula of Michigan: Geological Society of America Field Trip
Guide 24, p. 83-99.
Bornhorst, T.J., and Brandt, D., 2009, Michigans earliest geology: The Precambrian: in
Schaetzl, R., Darden, J., and Brandt, D., eds., Michigan Geography and Geology,
Pearson Custom Publishing, New York, p. 24-39.
Bornhorst, T.J., and Lankton, L.D., 2009, Copper mining: A billion years of geologic and
human history: in Schaetzl, R., Darden, J., and Brandt, D., eds, Michigan
Geography and Geology, Pearson Custom Publishing, New York, p. 150-173.
Rasilainen, K., Lahtinen, R., and Bornhorst, T. J., 2008, Chemical
characteristics of Finnish bedrock 1:1000000 scale bedrock map units: Geological
Survey of Finland, Report of Investigation 171, 96p.
Rasilainen, K., Lahtinen, R.
and Bornhorst, T. J., 2007. The Rock
Geochemical Database of Finland Manual. Geological Survey of Finland, Report of
Investigation 164, 38 p. The
Rock Geochemical Database of Finland (online database):
http://www.gtk.fi/publ/RGDB.
Rasilainen, K., Lahtinen, R. and Bornhorst, T.J., 2007, The Rock Geochemistry Database of Finland - a new tool for large scale exploration and crustal studies. In: Andrew, C.J. et al. (eds.) Digging deeper, Ninth biennial meeting of the Society for Geology Applied to Mineral Deposits, Dublin, Ireland 20th-23rd August 2007, p. 1267-1270.
Bornhorst, T.J., and Lankton, L.D., 2006, Keweenaw Copper: Geology and
History, published by Great Lakes Geoscience LLC, Ontonogan, MI, 2006, 30 p.
Karkkainen, N. K. and Bornhorst, T.J., 2003, The Svecofennian
gabbro-hosted Koivusaarenneva magmatic ilmenite deposit, Kalvia, Finland,
Mineralium Deposita, v. 38, p. 169-184.
Nurmi,
P.A., Bornhorst, T. J., and
Rasilainen, K., 2001, Pathfinder Elements for Hydrothermal Gold Mineralization:
From General to Case Studies: Proceedings of 2001: A Hydrothermal Odyssey,
James Cook University Economic Geology Research Unit Contribution 59, May 17 -
19, 2001, Townsville, Australia, p. 156-157.
Pregitzer,
K.S., Reed, D.D., Bornhorst, T.J.,
Foster, D.R., Mroz, G.D., McLachlan, J.S., Laks, P.E., Stokke, D.D., Martin,
P.E., Brown, S.E., 1999, A buried spruce forest provides evidence at the stand
and landscape scale for the effects of environment on vegetation at the
Pliestocene/Holocene boundary: Journal of Ecology, v. 88, p. 1-10.
Bornhorst, T.J., 1999, Geologic Setting of the Tilden and Empire Mines, Michigan:
Institute on Lake Superior Geology, Field Trip Guidebook, 45th
Annual Meeting, v. 45, part 2, p. 108-113.
Johnson, R.C., and Bornhorst, T.J., Geologic Field
Excursion to the Ishpeming Greenstone Belt: Institute on Lake Superior Geology,
Field Trip Guidebook, v. 45, part 2, p. 45-56.
Bornhorst, T.J. and Bair, S.E., 1999, Introduction to the Ropes
gold deposit in the Ishpeming Greenstone Belt, Michigan: Institute on Lake
Superior Geology, Field Trip Guidebook, v. 45, part 2, p. 29-44.
Johnson, R.C., and Bornhorst, T.J., 1999, An Introduction
to the Archean Ishpeming Greenstone Belt, Michigan: Institute on Lake Superior
Geology, Field Trip Guidebook, v. 45, part 2, p. 12-28.
Bornhorst,
T.J., Nurmi, P.A., and Kontoniemi, O., 1998, Geochemistry of
gold and associated elements in the Paleoproterozoic Osikonmaki gold deposit, southeastern
Bornhorst,
T.J., Thorpe, R.I., and Johnson, R.C., 1998, Lead isotope
study of veins in the Archean Ishpeming greenstone belt, Michigan: Economic
Geology, v. 93, p. 102-107.
Wahyudi, T., Bornhorst, T.J., and Nesbitt, C., 1998, A comparative study of
cyanide and bromine recovery of gold from a roasted Osikonmaki gold ore,
Taylor, L.G., and Bornhorst, T.J., 1998, A boiling model for the formation of
enargite-bearing veins in the Central City district, Colorado: The Mountain
Geologist, v. 35, p. 15-22.
Bornhorst,
T.J., 1997, Tectonic context of native copper deposits of
the North American Midcontinent rift system: Geological Society of America
Special Paper, 312, p. 127-136.
Marshak, S., Tinkham,
D., Alkmim, F.F., Brueckner, H., Bornhorst,
T., 1998, REPLY: Dome-and-keel provinces formed during Paleoproterozoic
orogenic collapse: Geology, v. 26, p. 475-477.
Marshak, S., Tinkham, D., Alkmin, F.,
Brueckner, H., and Bornhorst, T.,
1997, Dome-and-keel provinces formed during Paleoproterozoic orogenic
collaspe-core complexes, diapirs, or neither?: Examples from the Quadrilatero
Ferrifero and the Penokean orogen: Geology, v. 25, p. 415-418.
Nurmi, P.A., Bornhorst, T.J., and Kontas, E., 1997, Trace element signature of
selected gold deposits in the Fennoscandian Shield and the North American
Continent: in Papunen, H., ed., Mineral Deposits: Research and Exploration
Where do They Meet?, Balkema,
Bornhorst, T.J.,
1997, Preface, Canadian Journal of Earth Sciences, v. 34, no. 4, p. v-vi.
Bornhorst,
T.J., 1997, Evolution of ore-bearing Precambrian structures:
in Books for Geoscientists, Journal of Geoscience Education, v. 45, p. 87.
Bornhorst,
T.J., Nurmi, P.A., Rasilainen, K., and Kontas, E., 1995,
Trace element characteristics of selected epithermal gold deposits of
Bornhorst,
T.J., 1995, Relationship between native copper deposits and
tectonic development of the North American Midcontinent rift system: in Ojakangas,
R.W. et al. (eds.), Basement Tectonics 10, Balkema, Rotterdam, p. 19-23.
Woodruff, L.G., Bornhorst, T.J., and Nicholson, S.W., 1995, Overview -
Stratigraphy, structure, and ore deposits of the southern limb of the
Midcontinent rift system: Minnesota Geological Survey Guidebook Series No. 20,
"Field trip guidebook for the geology and ore deposits of the Midcontinent
rift in the Lake Superior region," p. 73-80.
Bornhorst,
T.J., 1995, Native copper in basalts of the Keweenaw
Pensinsula: Minnesota Geological Survey Guidebook Series No. 20, "Field
trip guidebook for the geology and ore deposits of the Midcontinent rift in the
Bornhorst,
T.J. and Rose, W.I., 1994, Self-guided geological field trip
to the Keweenaw Peninsula, Michigan: Institute on Lake Superior Geology
Proceedings, Field Trip Guidebook, v. 40, part 2, 185p. (4500 copies sold from May 1994 to 2014).
Bornhorst,
T.J., Rasilainen, K., and Nurmi, P.A., 1993, Geochemical
character of lithologic units in the Late Archean Hattu schist belt, Ilomantsi,
eastern Finland: Geological Survey of Finland Special Paper 17. p. 133-145.
Bornhorst,
T.J., and Rasilainen, K., 1993, Mass transfer during
hydrothermal alteration associated with Au mineralization within the late Archean
Hattu schist belt, Ilomantsi, eastern
Bornhorst,
T.J., and Wilkin, R.T., 1993, Fluid inclusion data for
selected quartz from gold prospects in the Hattu schist belt, Ilomantsi,
Finland: Geological Survey of Finland Special Paper 17, p. 317-322.
Bornhorst,
T.J., and Johnson, R.C., 1993, Geology of volcanic rocks in
the southern half of the Archean Ishpeming greenstone belt, Michigan: U. S.
Geological Survey Bulletin 1904-P, 13p.
Wilkin, R.T., and Bornhorst, T.J., 1993, Archean appinites from the northern complex,
Michigan: Journal of Geology, v. 101, p. 107-114.
Rasilainen, K., Nurmi, P.A., and Bornhorst, T.J., 1993, Rock geochemical
implications for gold exploration in the Late Archean Hattu schist belt,
Ilomantsi, eastern Finland: Geological Survey of Finland Special Paper 17, p.
353-362.
Wilkin, R.T., and Bornhorst, T.J., 1992, Geology and geochemistry of granitoid rocks
in the Archean northern complex, Michigan, U.S.A.: Canadian Journal of Earth
Sciences, v. 29, p. 1674-1685.
Bornhorst,
T.J., 1992, Relationship between native copper deposits and
tectonic development of the North American Midcontinent rift system: 10th
International Basement Tectonics Conference Program with Abstracts, p. 191-193.
Bornhorst,
T.J., 1992, An overview of the Keweenaw Peninsula native
copper district, Michigan: Society of Economic Geologists Guidebook Series, v.
13, p. 33-62.
Bornhorst,
T.J. and Whiteman, R.C., 1992, The Caledonia native copper
mine, Michigan, Society of Economic Geologists Guidebook Series, v. 13, p.
139-144.
Bornhorst,
T.J., 1992, Road log of bedrock geology and native copper
deposits of the Keweenaw Peninsula, Michigan: Society of Economic Geologists
Guidebook Series, v. 13, p. 105-138.
Bornhorst,
T.J. and McDowell, S.D., 1992, Michigan Tech Earth Science
Laboratory and Experimental Mine connecting with the Quincy Native Copper Mine,
Michigan: Society of Economic Geologists Guidebook Series, v. 13, p. 100-104.
Bornhorst,
T.J., 1992, Keweenaw Peninsula: in South Flank of
Mid-Proterozoic Midcontinent Rift and Archean and Lower Proterozoic Basement,
Wisconsin and Michigan, editor J.C. Green, 10th International Basement
Tectonics Conference Field Trip Guidebook, p. 42-69.
Blaske, A.R., Bornhorst, T.J., Brady, J.M., Marsh, T.M., McKitrick, S.A., 1991,
The Shumake volcanic dome-hosted epithermal, precious metal deposit, western
Mojave Desert, California: Economic Geology, v. 86, p. 1646-1656.
Johnson, R.C., and Bornhorst, T.J., 1991, Archean geology of the northern block of the
Ishpeming greenstone belt, Marquette County, Michigan: U. S. Geological Survey
Bulletin 1904-F, p. F1-F20.
Bornhorst,
T.J., 1991, Global Volcanism 1976-1985: The first decade of
reports from the Smithsonian Institution's scientific alert network (SEAN): in
Books for Geoscientists, Journal of Geological Education, v. 39, p. 154.
Bornhorst,
T.J., 1991, Copper deposits and host rocks, western Upper
Peninsula of Michigan: Minnesota Geological Survey Information Circular 34, p.
64-72 (Proceedings of U.S.A.-U.S.S.R.-Canada Joint Seminar on Precambrian
geology of the southern Canadian shield and the eastern Baltic Shield held
August, 1990, Duluth, Minnesota).
Bornhorst,
T. J., 1990, The Volcano Letter: in Books for Geoscientists,
Journal of Geological Education, v. 38, p. 257-258.
Bornhorst,
T.J., 1989, A field guide to the Keweenaw Peninsula native
copper district: Society of Economic Geologists Fall Field Conference
Guidebook, October 1-5, 1989, p. 116-141.
Bornhorst,
T.J., Kalliokoski, J., Paces, J.B., and Rose, W.I., Jr.,
1989, Stops 30 to 40: Lake Superior Basin Segment of the Mid-Continent Rift
System: 28th International Geological Congress, Field Trip Guide Book T344, p.
T344-43-T344-51 (published by American Geophysical Union).
Bornhorst,
T.J., 1988, Character of mid-Cenozoic andesites, basaltic
andesites and related volcanic rocks, Mogollon-Datil volcanic field,
southwestern New Mexico: Colorado School of Mines Quarterly, v. 83, no. 1, p.
1-13.
Bornhorst,
T.J., 1988, Gold in mantle peridotites from Upper
Proterozoic ophiolites in Arabia, Mali, and Morocco - A discussion: Economic
Geology, v. 83, p. 1285.
Bornhorst,
T.J., Paces, J.B., Grant, N.K., Obradovich, J.D. and Huber,
N.K., 1988, Age of native copper mineralization, Keweenaw Peninsula, Michigan:
Economic Geology, v. 83, p. 619-625.
Bornhorst,
T.J., 1988, Granophile elements in mid-Cenozoic calc-alkalic
rhyolitic volcanic rocks, Mogollon-Datil volcanic field, southwestern New
Mexico: Canadian Institute of Mining, Special Volume 39, p. 331-341.
Bornhorst,
T.J., 1988, Geological overview of the Marquette greenstone
belt, Michigan: 34th Annual Insititue on Lake Superior Geology, Field Trip
Guidebooks, v. 34, p. A1-A18.
Diehl, J.F., McClannahan, K.M., and Bornhorst, T.J., 1988, Paleomagnetic
results from the Mogollon-Datil volcanic field, southwestern New Mexico and a
mid-Tertiary reference pole for North America: Journal of Geophysical Research,
v. 93, p. 4869-4879.
Li, G., Whitten, E.H.T., Bornhorst, T.J., and Hicks, D.L., 1988, Subdivision among samples
on the basis of numerous variables: The Compass of Sigma Gamma Epsilon, v. 66,
no. 1, p. 7-14.
Halsor, S.P., Bornhorst, T.J., Strowd, W., Beebe, M. and Richardson, K., 1988,
The geology of the DeLamar Silver Mine,
Bornhorst,
T.J., 1988, Road Log Stops 7, 9, 10, and 14: in Upper
Keweenawan rift-fill sequence, mid-continent rift system, Michigan: Michigan
Basin Geological Society 1988 Fall Field Trip Guidebook, p. 53-60, 69-70.
Bornhorst,
T.J., Baxter, D.A., MacLellan, M.L., and Johnson, R.C.,
1988, Geological field trip to the Marquette Greenstone Belt: Part I, Day 1
Road Log - Stops 1 to 11: Institute on Lake Superior Geology, Field Trip Guidebooks,
v. 34, Part 2, p. A54-A64.
Bornhorst,
T.J. and Baxter, D.A., 1988, Geological field trip to the
Marquette Greenstone Belt: Part II, Day 2 Road Log - Stops A to E: Institute on
Lake Superior Geology, Field Trip Guidebooks, v. 34, Part 2, p. A65-A71.
Green, J.C., Bornhorst, T.J., Chandler, V.W., Mudrey, M.G., Jr., Myers, D.E.,
Pesonen, L., and Wilband, J.T., 1987, Late-middle Proterozoic (Keweenawan)
dykes of the western Lake Superior region: Evidence for evolution of the North
American midcontinent rift: Geological Association of Canada Special Paper 34,
p. 289-302.
Tilling, R.I., Bornhorst, T.J., Taggart, J.E., Jr., Rose, W.I., and McGee, J.J.,
1987, Inter-laboratory comparisons of X-ray fluorescence analyses of eruptive
products of El Chichon volcano, Chiapas, Mexico: Applied Geochemistry, v. 2, p.
337-345.
Rose, W.I., Jr., Newhall, C.G., Bornhorst, T.J., and Self, S., 1987,
Quaternary silicic pyroclastic deposits of Atitlan caldera, Guatemala: Journal
of Volcanology and Geothermal Research, v. 33, p. 57-80.
Whitten, E.H.T., Li, G., Bornhorst, T.J., Christenson, P., and Hicks, D.L., 1987,
Quantitative recognition of granitoid suites within batholiths and other
igneous assemblages: in Use and Abuse of Statistical Methods in the Earth
Sciences, International Association of Mathematical Geology, Studies in
Mathematical Geology, No. 1, p. 55-73.
Bauer, G.R., Fodor, R.V., Jacobs, R.S., and Bornhorst, T.J., 1987, Kahoolawe
Island, Hawaii: Initial geochemical investigation of its tholeiitic, alkalic,
and unusual "enrichment" characteristics: Journal of Volcanology and
Geothermal Research, v. 31, p. 171-176.
Whitten, E.H.T., Bornhorst, T.J., Li, G., Hicks, D.L., and Beckwith, P., 1987,
Suites: Suites, subdivision of batholiths, and igneous rock classification: Geological
and mathematical conceptualization: American Journal of Science, v. 287, no. 4,
p. 332-352.
Bornhorst,
T.J., Shepeck, A.W. and Rossell, D.M., 1986, The Ropes gold
mine, Marquette County, Michigan, U.S.A.: An Archean hosted lode gold deposit:
in MacDonald, A.J., Ed., Proceedings of Gold 86, an International Symposium on
the Geology of Gold, Toronto, 1986, p. 213-227.
Bornhorst,
T.J. and Rose, W.I., Jr., 1986, Partitioning of gold in
young calc-alkalic volcanic rocks from Guatemala: Journal of Geology, v. 94, p.
412-418.
Rose, W.I., Jr., Bornhorst, T.J., and Sivonen, S.J., 1986, Rapid and high quality
major and trace element analyses of powdered rock by X-ray fluorescence
spectrometry: X-Ray Spectrometry, v. 15, p. 55-60.
Bornhorst,
T., Kalliokoski, J., and Paces, J., 1986, The Keweenaw
Native-Copper District: in Brown, A.C. and Kirkham, R.V. (eds.), Proterozoic
sediment-hosted stratiform copper deposits of Upper Michigan and Belt
Supergroup of Idaho and Montana, Geological Association of Canada,
Mineralogical Association of Canada, Canada Geophysical Union, Joint Annual
Meeting, Ottawa '86, Field Trip 1: Guidebook, p. 21-36.
Bornhorst,
T.J., 1985, Abundance and variability of selected lithophile
elements in high-K rhyolitic volcanic rocks, Mogollon-Datil volcanic field,
southwestern New Mexico: International Canadian Institute of Mining Conference
on Granite-Related Mineral Deposits, Halifax, Nova Scotia, Canada, editors R.P.
Taylor and D.F. Strong, p. 25-31.
Bornhorst,
T.J. and Kent, G.R., 1985, Geochemistry of host rock
alteration at the Eberle Mine, Mogollon mining district, southwestern New
Mexico: New Mexico Bureau of Mines and Mineral Resources Circular 199, p. 7-15.
Bornhorst,
T.J. and Wolfe, S.P., 1985, Abundance of silver in
mid-Cenozoic volcanic rocks of the Mogollon-Datil volcanic field, southwestern
New Mexico: New Mexico Bureau of Mines and Mineral Resources Circular 199, p.
41-43.
Green, J.C., Bornhorst, T.J., Chandler, V.W., Mudrey, M.G., Jr., Myer, P.E.,
Pesonen, L. and Wilband, J.T., 1985, Late-middle Proterozoic (Keweenawan) dykes
of the western Lake Superior region: Evidence for evolution of the North
American mid-continent rift: International Conference on Mafic Dyke Swarms,
Mississaugo, Canada, editor H.C. Halls, p. 59-61.
Bornhorst,
T.J., Kent, G.R., Mann, K.L., and Richey, S.R., 1984,
Temperature of mineralization in Mogollon mining district and vicinity,
southwest New Mexico: New Mexico Geology, v. 6, p. 53-55.
Bornhorst,
T.J., Rose, W.I.,Jr., Wolfe, S.P., and Hoffman, 1984, Gold
content of eleven French geochemical reference standards: Geostandards
Newsletter, v. 8, p. 1-2.
Rose, W.I., Jr., Bornhorst, T.J., Halsor, S.P., Capaul, W.A., Plumley, P.S., de la
Cruz-Reyna, S., Mena, M., and Mota, R., 1984, Volcan el Chichon, Mexico:
Pre-1982 S-rich eruptive activity: Journal of Volcanology and Geothermal
Research, v. 23, p. 147-167.
Bornhorst,
T.J. and Brookins, D.G., 1983, Sr isotopic initial ratios
for mid-Cenozoic volcanic rocks from the Mogollon-Datil volcanic field,
southwestern New Mexico: Isochron/West, no. 36, p. 13-15.
Drexler, J.W., Bornhorst, T.J., and Noble, D.C., 1983, Trace-element potassium
feldspar/glass distribution coefficients for peralkaline silicic rocks: Lithos,
v. 16, p. 265-271.
Stuart, E.J., Bornhorst, T.J., Rose, W.I., Jr., and Noble, D.C., 1983,
Distribution and mobility of uranium and thorium in the peralkaline Soldier
Meadow Tuff, northwestern Nevada: Economic Geology, v. 78, p. 353-358.
Bornhorst,
T.J., Rose, W.I., Jr., and Paces, J.B., 1983, Field guide to
the geology of the Keweenaw Peninsula, Michigan: Institute on Lake Superior
Geology Proceedings, v. 29, 116 p. (1800
total copies sold from May 1983 to May 1994).
Bornhorst,
T.J., Jones, D.P., Elston, W.E., Damon, P.E., and
Shafiquallah, M., 1982, New radiometric ages on volcanic rocks from the
Mogollon-Datil volcanic field, southwestern New Mexico: Isochron/West, no. 35,
p. 13-14.
Rose, W.I., Jr., Bornhorst, T.J., and Drexler, J.W., 1982, Preliminary correlation
of Quaternary volcanic ashes from the middle America trench off Guatemala, Deep
Sea Drilling Project Leg 67: in Aubuoin, J. von Huene, R., et al., Initial
Reports DSDP 67, Washington (U.S. Gov`t. Printing Office), p. 493-495.
Bornhorst,
T.J. and Elston, W.E., 1981, Uranium and thorium in
mid-Cenozoic rocks of the Mogollon-Datil volcanic field, southwestern New
Mexico: American Association of Petroleum Geologists Studies in Geology, No.
13, Uranium in Volcanic and Volcaniclastic Rocks, p. 145-154.
Rose, W.I., Jr., and Bornhorst, T.J., 1981, Concentrations and isotropic distribution of
uranium and thorium in selected Quaternary volcanic rocks from Guatemala and
Sumatra: Evidence for uranium redistribution: American Association of Petroleum
Geologists Studies in Geology, No. 13, Uranium in Volcanic and Volcaniclastic
Rocks, p. 13-21.
Casadevall, T.J., Johnston, D.A., Harris,
D.M., Rose, W.I., Jr., Malinconico, L.L., Stoiber, R.E., Bornhorst, T.J., Williams, S.N., Woodruff, L., and Thompson, J.M.,
1981, SO2 emission rates at Mount St. Helens: March 29 to November
1, 1980: U.S. Geological Survey Bulletin 1250, p. 193-200.
Harris, D.M., Sato, M., Casadevall, T.J.,
Rose, W.I., Jr., and Bornhorst, T.J.,
1981, Emission rates of CO2 at Mount St. Helens volcano: U.S.
Geological Survey Bulletin 1250, p. 201-207.
Fodor, R.V., Kumar, K., Bornhorst, T.J., and Husler, J.W., 1980, Petrology of basaltic
rocks from the Sao Paulo ridge, southwestern Atlantic Ocean: Marine Geology, v.
36, p. 127-141.
Bornhorst,
T.J. and Balagna, J.P., 1979, Instrumental neutron
activation analysis of French geochemical samples: Geostandards Newsletter, v.
3, p. 177-180.
Lopez, D.A. and Bornhorst, T.J., 1979, Geologic map of the Datil area, Catron
County, New Mexico: U.S. Geological Survey Miscellaneous Investigations Map
I-1098, 1 sheet, 1:50,000.
Elston, W.E. and Bornhorst, T.J., 1979, The Rio Grande rift in context with post-40
m.y. volcanic and tectonic events, in Rio Grande Rift: Tectonics and Magmatism,
American Geophysical Union Special Publication, p. 416-438.
Bornhorst,
T.J. and Elston, W.E., 1978, Road log from Reserve, New
Mexico to Magdalena, New Mexico via Horse Springs and Datil: New Mexico
Geological Society Special Publication Number 7, p. 99-105
Bornhorst,
T.J., Erb, E.E., and Elston, W.E., 1976, Reconnaissance
geologic map of the Mogollon-Datil volcanic province: New Mexico Geological
Society Geologic Map, 2 sheets, 1:350,000.
Rhodes, R.C. and Bornhorst, T.J., 1976, Petrologic provinces in Jurassic tholeiites
of Gondwanaland: Geologische Rundschau, v. 65, p. 930-938.
Rhodes, R.C. and Bornhorst, T.J., 1975, Applications of discriminant function
analysis to the felsic rocks of the Bushveld Complex, South Africa: Lithos, v.
8, p. 193-197.
Bornhorst,
T.J. 1975, Petrochemistry of the Fish Cove rhyolite, Keweenaw
Peninsula, Michigan, U.S.A.: Chemical Geology, v. 15, p. 295-302.
PUBLISHED ARCHIVAL REPORTS
Wilkin, R.T., Johnson, R.C. and Bornhorst, T.J., 1992, Bedrock geologic
map of the Negaunee NW quadrangle, Marquette County, Michigan: Contribution to
Michigan Geology 92-2, (map 1:24000), published by Michigan Geological Survey.
Wilkin, R.T. and Bornhorst, T.J., 1992, Geochemical data for bedrock samples from
the Negaunee NW quadrangle, Marquette County, Michigan: Contribution to
Michigan Geology 92-3, 9 p., published by Michigan Geological Survey.
Wilkin, R.T. and Bornhorst, T.J., 1990, Geology of the Boise Creek area, Marquette
greenstone belt, Michigan: Contribution to Michigan Geology Report 90-3, 15 p.
and map (1:6000), published by Michigan Geological Survey.
Small, J.R. and Bornhorst, T.J., 1990, Precambrian geology of the Penny Lake area,
Marquette greenstone belt, Michigan: Contribution to Michigan Geology Report
90-1, 26 p. and map (1:6000), published by Michigan Geological Survey.
Bornhorst,
T.J. and Baxter, D.A., 1990, Reconnaissance evaluation of
platinum-group elements in selected Precambrian rocks of the western Upper
Peninsula, Michigan: Contribution to Michigan Geology Report 90-2, 30 p,
published by Michigan Geological Survey.
MacLellan, M.L. and Bornhorst, T.J., 1989, Bedrock geology of the Reany Lake area,
Marquette County, Michigan: Michigan Geological Survey, Department of Natural
Resources, Open-File Report, OFR-89-2, 111 p. and map (1:6000).
Blaske, A., Bornhorst, T.J., Johnson, A.M., Frantti, G.E., and Reed, R.C.,
1988, Manganese investigation in Keweenaw County, Michigan: Michigan Geological
Survey, Department of Natural Resources, Open-File Report, OFR-88-2, 36 p.
Bornhorst,
T.J., 1988, Geological overview of the Marquette Greenstone
Belt, Michigan: Institute on Lake Superior Geology, Field Trip Guidebooks, v.
34, part 2, p. A1-A18.
Baxter, D.A., Bornhorst, T.J., and VanAlstine, J.C., 1987, Geology, structure,
and associated precious metal mineralization of Archean rocks in vicinity of
Clark Creek, Marquette County, Michigan: Michigan Geological Survey, Department
of Natural Resources, Open-File Report OFR-87-8,54 p. and map (1:6000).
Johnson, R.C., Bornhorst, T.J., and VanAlstine, J., 1987, Geologic setting of
precious metal mineralization in the Silver Creek to Island Lake area,
Marquette County, Michigan: Michigan Geological Survey, Department of Natural
Resources, Open-File Report, OFR-87-4, supersedes OFR-86-2, 134 p. and map
(1:6000).
Bornhorst,
T.J., Ruotsala, A.P., and Stadnik, P.M., 1987, Cobalt,
nickel, and vanadium contents of pyrite concentrates from the Michigamme
Formation, northern Michigan: Michigan Geological Survey, Department of Natural
Resources, Open-File Report, OFR-87-6, 26 p.
Johnson, R.C., Bornhorst, T.J., and VanAlstine, J., 1986, Geology and precious
metal mineralization of the Silver Creek to Rocking Chair Lakes area, Marquette
County, Michigan: Michigan Geological Survey Department of Natural Resources,
Open-File Report, OFR-86-2, 37 p. and map (1:6000).
Boben, C.L., Bornhorst, T.J., and VanAlstine, J., 1986, Detailed geological
study of three precious metal prospects in Marquette County and one in Gogebic
County, Michigan: Michigan Geological Survey, Department of Natural Resources,
Open-File Report, OFR-86-1, 40 p. and 4 maps (1:6000 to 2400).
Owens, E. and Bornhorst, T.J., 1985, Geology of precious metal prospects north of
the Dead River storage basin in Section 35, T49N, R27W, and north part of
Section 2, T48N, R27W, Marquette County, Michigan: Michigan Geological Survey,
Department of Natural Resources, Open-File Report, OFR-85-2, 105 p. and map and
cross-section (1:2400).
Holm, D.M. and Bornhorst, T.J., 1978, Probes - October 1, 1977 to September 30,
1978: Los Alamos Scientific Laboratory Progress Report, LA-7796-PR, 5 p.
PUBLISHED ABSTRACTS
~120 total
RESEARCH ADVISEMENT
Chairperson
(and Co-Chair) Completed: 27 M.S. Theses, 4 Ph.D. Dissertations.
Committee
Member Completed (does not include those chaired): 50 M.S. Theses, 12 Ph.D.
Dissertations (2 European Ph.D. committees)
"Senior
undergraduate" Independent Research Projects Completed: 29