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Calvin Alexander

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E. Calvin Alexander Jr is an American geochemist, hydrogeologist, and planetary scientist, known for his research on noble gas isotopes, meteorites, lunar samples,[1] groundwater residence times,[2] and karst hydrogeology.[3] He is Morse–Alumni Professor Emeritus in the Department of Earth and Environmental Sciences at the University of Minnesota.[4]

He is a fellow of the Geological Society of America[5] and National Speleological Society.[6]

Biography

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Alexander was born and raised in Oklahoma.

He earned his Bachelor of Science in chemistry from Oklahoma State University. He completed his Ph.D. in chemistry at the University of Missouri–Rolla, where his doctoral research focused on noble gas isotopic geochemistry of meteorites and terrestrial samples.[7]

He subsequently conducted postdoctoral research in the Department of Physics at the University of California, Berkeley, where he applied noble gas isotope techniques to dating Apollo lunar samples and meteorites.[8]

Career

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Alexander joined the University of Minnesota in 1973, in what was then the Department of Geology and Geophysics (now the Department of Earth and Environmental Sciences).[7] Since 2014, he has held the title of Morse–Alumni Professor Emeritus in the Department of Earth Sciences at the University of Minnesota. He previously served as Morse–Alumni Professor in Earth Sciences from 2011 to 2014.[8]

He served as curator of Meteorites at the University of Minnesota, and remains active as emeritus curator, assisting with the identification of suspected meteorites.[9]

Research

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Alexander's research spans multiple fields, with a particular emphasis on karst hydrogeology and groundwater systems.[10] A major theme of his work has been the study of human–karst interactions and groundwater vulnerability, especially in southeastern Minnesota, where he examined how land use, agriculture, and infrastructure affect groundwater quality in karst terrains and contributed to research on groundwater pollution prevention.[7]

Another focus of his work has been hydrogeologic flow characterization in complex karst environments.[11] His research has included the use of dye tracing to delineate groundwater flow systems and the mapping of springsheds that supply cold-water trout streams, revealing the role of subsurface conduits and rapid groundwater transport pathways.[10][12]

Alexander has also contributed to karst mapping and field guides, co-authoring technical reports and field trip guidebooks describing Ordovician karst features in southeastern Minnesota and their regional geological context.[13][14]

He has participated in hydrogeologic baseline and monitoring studies, including projects at the University of Minnesota's UMore Park, where he helped assess groundwater quality, connectivity, and long-term system behavior.[15]

Selected publications

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  • Brick, Greg A.; Alexander Jr., E. Calvin, eds. (2021). Caves and Karst of the Upper Midwest, USA: Minnesota, Iowa, Illinois, Wisconsin. Cave and Karst Systems of the World (1st ed. 2021 ed.). Cham: Springer International Publishing. doi:10.1007/978-3-030-54633-5. ISBN 978-3-030-54632-8.
  • Doctor, Daniel H.; Alexander, E. Calvin (2021), "Karst Geology of the Upper Midwest, USA", in Brick, Greg A.; Alexander Jr., E. Calvin (eds.), Caves and Karst of the Upper Midwest, USA: Minnesota, Iowa, Illinois, Wisconsin, Cham: Springer International Publishing, pp. 1–21, Bibcode:2021ckum.book.3351D, doi:10.1007/978-3-030-54633-5_1, ISBN 978-3-030-54633-5, retrieved 2026-01-31
  • Alexander, E. Calvin; Brick, Greg A. (2021), "Minnesota Caves and Karst", in Brick, Greg A.; Alexander Jr., E. Calvin (eds.), Caves and Karst of the Upper Midwest, USA: Minnesota, Iowa, Illinois, Wisconsin, Cham: Springer International Publishing, pp. 37–114, doi:10.1007/978-3-030-54633-5_3, ISBN 978-3-030-54633-5, retrieved 2026-01-31
  • Feinberg, Joshua; Gao, Yongli; Alexander, E. C.; Geological Society of America, eds. (2016). Caves and karst across time. Special paper / The Geological Society of America. Boulder, Colorado: Geological Society of America. ISBN 978-0-8137-2516-1.
  • Yuhr, Lynn B.; Alexander, Jr., E. Calvin; Beck, Barry F. (2008-09-18). Sinkholes and the Engineering and Environmental Impacts of Karst. Geotechnical Special Publication. Vol. 183. American Society of Civil Engineers. pp. i–xx. doi:10.1061/9780784410035. ISBN 978-0-7844-1003-5.
  • Alexander, Jr., E. Calvin; Quinlan, James (1992-01-01). "Practical tracing of groundwater, with emphasis on karst terranes". Geological Society of America.{{cite journal}}: CS1 maint: multiple names: authors list (link)

References

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  1. ^ Moskowitz, Clara (2013-07-01). "Rare Meteorite Found in Minnesota:Scientist Calvin Alexander with Meteorite". Space. Retrieved 2026-01-31.
  2. ^ ALEXANDER, SCOTT C. "Residence Times of Minnesota Groundwaters". digitalcommons.morris.
  3. ^ Davies, Gareth J. "Session: Advances in Cave and Karst (Posters): A Tribute to the Distinguished Career of E. Calvin Alexander Jr. (GSA Annual Meeting in Denver, Colorado, USA - 2016)". gsa.confex.com. Retrieved 2026-01-31.
  4. ^ Hultgren, Olivia; Oo, Pauline. "From planet Earth to outer space | College | College of Science and Engineering". cse.umn.edu. Retrieved 2026-01-31.
  5. ^ "GSA Fellowship - Hydrogeology Division 2015 Fellow Recipients". community.geosociety.org. Retrieved 2026-01-31.
  6. ^ "Science Award Recipients". National Speleological Society. Retrieved 2026-01-31.
  7. ^ a b c Allmann, Laurie (2024-08-17). "How old is the water?". Agate. Retrieved 2026-01-31.
  8. ^ a b "AIPG MN March Luncheon!". AIPG Minnesota. Retrieved 2026-01-31.
  9. ^ Reguero, Anastasiia. "Recovery and Identification of Minnesota's 10th Known Meteorite | Earth & Environmental Sciences | College of Science and Engineering". cse.umn.edu. Retrieved 2026-01-31.
  10. ^ a b Greene, Julie; Alexander Jr., E. Calvin (2009). "Dye Tracing to Understand Karst Groundwater Flow Systems In Southeastern Minnesota". University Digital Conservancy. hdl:11299/185245.
  11. ^ Alexander, Jr (2012-04-26). "Karst Hydrogeology and the Nature of Reality Revisited: Philosophical Musings of a Less Frustrated Curmudgeon". Sinkholes and the Engineering and Environmental Impacts of Karst: 1–2. doi:10.1061/40796(177)1. ISBN 978-0-7844-0796-7.
  12. ^ Friedrichs, Joe. "DNR does not complete dye-trace study at Devil's Kettle". archive.wtip.org. Retrieved 2026-01-31.
  13. ^ "Protecting water in karst regions | Minnesota Pollution Control Agency". www.pca.state.mn.us. Retrieved 2026-01-31.
  14. ^ Feinberg, Joshua M.; Gao, Yongli; Alexander, E. Calvin (2016), "Introduction", Geological Society of America Special Papers, vol. 516, Geological Society of America, pp. v–xiii, doi:10.1130/2016.2516(01), ISBN 978-0-8137-2516-1, retrieved 2026-01-31
  15. ^ Aiken, Jim; Christianson, Evan; Anger, Cale. "Groundwater Considerations for Gravel Mining at UMore Park: Background, Groundwater Modeling, and Monitoring" (PDF). Minnesota Ground Water Association.
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