Sulfur-isotope variations in Pennsylvanian shales of the midwestern United States

Abstract

Research Article| January 01, 1988 Sulfur-isotope variations in Pennsylvanian shales of the midwestern United States Raymond M. Coveney, Jr.; Raymond M. Coveney, Jr. 1Department of Geosciences, University of Missouri, Kansas City, Missouri 64110-2499 Search for other works by this author on: GSW Google Scholar Nelson R. Shaffer Nelson R. Shaffer 2Indiana Geological Survey, 611 North Walnut Grove, Bloomington, Indiana 47405 Search for other works by this author on: GSW Google Scholar Geology (1988) 16 (1): 18–21. https://doi.org/10.1130/0091-7613(1988)016<0018:SIVIPS>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Raymond M. Coveney, Nelson R. Shaffer; Sulfur-isotope variations in Pennsylvanian shales of the midwestern United States. Geology 1988;; 16 (1): 18–21. doi: https://doi.org/10.1130/0091-7613(1988)016<0018:SIVIPS>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyGeology Search Advanced Search Abstract Conditions of sedimentation have affected isotopes in coarse-grained sulfides from Pennsylvanian shales. For example, the Mecca Shale Member (Desmoinesian Series) contains highly variable values for δ34S (≈;-10‰ ; σ, standard deviation, ≈9) near the ancient shoreline of the Illinois basin, whereas equivalent strata in Missouri and Kansas, farther from the ancient shoreline, have more negative and less variable values (-14.5‰; σ ≈ 5). Sulfides from younger beds in the Missourian Series contain still lighter and less variable sulfur (δ34S ≈ -27‰; σ ≈ 3.1). Because low δ34S values are typical of sediments deposited in anoxic deep waters, these results suggest that Missourian shales formed slowly in deep waters. The Desmoinesian shales may have been deposited more rapidly in shallower seas. Alternatively, secular shifts for δ34S in sea-water SO4 may have been stronger than previously realized. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.