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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Calvin Alexander | 1/1 | https://en.wikipedia.org/wiki/Calvin_Alexander | reference | science, encyclopedia | 2026-05-05T17:23:54.631590+00:00 | kb-cron |
E. Calvin Alexander Jr is an American geochemist, hydrogeologist, and planetary scientist, known for his research on noble gas isotopes, meteorites, lunar samples, groundwater residence times, and karst hydrogeology. He is Morse–Alumni Professor Emeritus in the Department of Earth and Environmental Sciences at the University of Minnesota. He is a fellow of the Geological Society of America and National Speleological Society.
== Biography == 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. 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.
== Career == 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). 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. He served as curator of Meteorites at the University of Minnesota, and remains active as emeritus curator, assisting with the identification of suspected meteorites.
== Research == Alexander's research spans multiple fields, with a particular emphasis on karst hydrogeology and groundwater systems. 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. Another focus of his work has been hydrogeologic flow characterization in complex karst environments. 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. 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. 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.
== Selected publications == 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), Brick, Greg A.; Alexander Jr., E. Calvin (eds.), "Karst Geology of the Upper Midwest, USA", 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{{citation}}: CS1 maint: work parameter with ISBN (link) Alexander, E. Calvin; Brick, Greg A. (2021), Brick, Greg A.; Alexander Jr., E. Calvin (eds.), "Minnesota Caves and Karst", 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{{citation}}: CS1 maint: work parameter with ISBN (link) 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". ASCE/GI Geotechnical Special Publication No. 183. Reston, VA: American Society of Civil Engineers: i–xx. doi:10.1061/9780784410035.fm. 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 ==