Origin of illite in the lower Paleozoic of the Illinois basin: Evidence for brine migrations

Research Article| August 01, 2001 Origin of illite in the lower Paleozoic of the Illinois basin: Evidence for brine migrations Georg H. Grathoff; Georg H. Grathoff 1Department of Geology, Portland State University, Portland, Oregon 97207-0751, USA Search for other works by this author on: GSW Google Scholar Duane M. Moore; Duane M. Moore 2Illinois State Geological Survey, 615 East Peabody Drive, Champaign, Illinois 61820, USA Search for other works by this author on: GSW Google Scholar Richard L. Hay; Richard L. Hay 3Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar Klaus Wemmer Klaus Wemmer 4Institut für Geologie und Dynamik der Lithosphäre, Goldschmidtstrasse 3, Universität Göttingen, D-37077 Göttingen, Germany Search for other works by this author on: GSW Google Scholar Author and Article Information Georg H. Grathoff 1Department of Geology, Portland State University, Portland, Oregon 97207-0751, USA Duane M. Moore 2Illinois State Geological Survey, 615 East Peabody Drive, Champaign, Illinois 61820, USA Richard L. Hay 3Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA Klaus Wemmer 4Institut für Geologie und Dynamik der Lithosphäre, Goldschmidtstrasse 3, Universität Göttingen, D-37077 Göttingen, Germany Publisher: Geological Society of America Received: 25 Aug 1999 Revision Received: 08 Aug 2000 Accepted: 27 Nov 2000 First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2001) 113 (8): 1092–1104. https://doi.org/10.1130/0016-7606(2001)113<1092:OOIITL>2.0.CO;2 Article history Received: 25 Aug 1999 Revision Received: 08 Aug 2000 Accepted: 27 Nov 2000 First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Georg H. Grathoff, Duane M. Moore, Richard L. Hay, Klaus Wemmer; Origin of illite in the lower Paleozoic of the Illinois basin: Evidence for brine migrations. GSA Bulletin 2001;; 113 (8): 1092–1104. doi: https://doi.org/10.1130/0016-7606(2001)113<1092:OOIITL>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract In the lower Paleozoic of the Illinois Basin, three illite polytypes are found: 2M1 of detrital origin, and 1Md and 1M of diagenetic origin. Illite polytype quantification of detrital 2M1 illite and diagenetic 1Md and 1M illite, combined with K-Ar age dating, allows extrapolation to apparent detrital and diagenetic illite ages. Kinetic modeling of smectite illitization, combined with the calculated age of illitization, can evaluate different origins of illite. The diagenetic illite in the lower Paleozoic of the Illinois Basin is interpreted not to have formed solely by burial diagenesis but mainly during multiple brine events.The Upper Ordovician Maquoketa Group contains diagenetic illite (dominantly 1Md with minor 1M) with an extrapolated age of ∼360 m.y. (356–377 m.y.) and formed from smectite at temperatures of 50–100 °C. This age falls within the span of dates for illite/smectite (I/S) in K-bentonites from the Upper Mississippi Valley and is interpreted to be a combined result of illitization by burial diagenesis and either a hydrothermal brine from the southern and deeper part of the basin or a K-rich brine from the Michigan Basin, Upper Mississippi Valley area, or Forest City Basin.In Ordovician and Cambrian shale partings and sandstone older than the Maquoketa Group, the diagenetic illite (1Md in shale and 1M in sandstone) has an age of ∼300 m.y. and formed at temperatures <140 °C. This late Paleozoic age falls within the range of illites from sandstone in the Upper Mississippi Valley and K-bentonites of the Appalachian Basin; it coincides with the Alleghany orogeny and is interpreted as having formed by gravity-driven flow from the uplifted Alleghanian-Ouachita orogenic belt that drove hot (<140 °C) fluids through the Illinois Basin. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.