Trace-element anomalies at the Mississippian/Pennsylvanian boundary in Oklahoma and Texas

Abstract

Research Article| December 01, 1986 Trace-element anomalies at the Mississippian/Pennsylvanian boundary in Oklahoma and Texas Charles J. Orth; Charles J. Orth 1Isotope and Nuclear Chemistry Division Los Alamos National Laboratory, Los Alamos, New Mexico 87545 Search for other works by this author on: GSW Google Scholar Leonard R. Quintana; Leonard R. Quintana 1Isotope and Nuclear Chemistry Division Los Alamos National Laboratory, Los Alamos, New Mexico 87545 Search for other works by this author on: GSW Google Scholar James S. Gilmore; James S. Gilmore 1Isotope and Nuclear Chemistry Division Los Alamos National Laboratory, Los Alamos, New Mexico 87545 Search for other works by this author on: GSW Google Scholar Robert C. Grayson, Jr.; Robert C. Grayson, Jr. 2Department of Geology, Baylor University, Waco, Texas 76798 Search for other works by this author on: GSW Google Scholar Edwin H. Westergaard Edwin H. Westergaard 2Department of Geology, Baylor University, Waco, Texas 76798 Search for other works by this author on: GSW Google Scholar Geology (1986) 14 (12): 986–990. https://doi.org/10.1130/0091-7613(1986)14<986:TAATMB>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Charles J. Orth, Leonard R. Quintana, James S. Gilmore, Robert C. Grayson, Edwin H. Westergaard; Trace-element anomalies at the Mississippian/Pennsylvanian boundary in Oklahoma and Texas. Geology 1986;; 14 (12): 986–990. doi: https://doi.org/10.1130/0091-7613(1986)14<986:TAATMB>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 SocietyGeology Search Advanced Search Abstract Trace-element abundance anomalies have been found at the Mississippian/Pennsylvania boundary at sites in Oklahoma and Texas where the boundary has been precisely located on the basis of an abrupt change in conodont diversity and species composition. Enriched elements include osmium, indium, platinum, chromium, most chalcophiles, rare earths, and uranium. The anomalies are more intense (e.g., Os = 4 ppb, Ir = 0.38 ppb, Pt = 6 ppb, Cr = 12000 ppm, U = 380 ppm) and peisist through a thicker interval at the south-central Texas locality than in Oklahoma, and in bolh locations the anomalies are associated with an increase in phosphate content of the rocks. There is no tangible evidence of an asteroid or comet impact source for the excess Pt-group elements and fauna! crisis. The cause of the elemental enrichments and the biological disturbance may possibly be related to a change in the ocean chemistry of the Paleozoic seaway, such as increased upwelling, stagnation, or nearby submarine volcanism. 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.