Pyrite ooids in Devonian black shales record intermittent sea-level drop and shallow-water conditions

Abstract

Research Article| April 01, 2004 Pyrite ooids in Devonian black shales record intermittent sea-level drop and shallow-water conditions Jürgen Schieber; Jürgen Schieber 1Department of Geological Sciences, Indiana University, Bloomington, Indiana 47405, USA Search for other works by this author on: GSW Google Scholar Lee Riciputi Lee Riciputi 2Chemical and Analytical Services Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6365, USA Search for other works by this author on: GSW Google Scholar Geology (2004) 32 (4): 305–308. https://doi.org/10.1130/G20202.1 Article history received: 13 Sep 2003 rev-recd: 23 Dec 2003 accepted: 24 Dec 2003 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jürgen Schieber, Lee Riciputi; Pyrite ooids in Devonian black shales record intermittent sea-level drop and shallow-water conditions. Geology 2004;; 32 (4): 305–308. doi: https://doi.org/10.1130/G20202.1 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 Upper Devonian black shales of the eastern United States contain in places unusual beds of pyrite ooids. Textural and geochemical studies show that these originated as chamositic iron ooids that were replaced by pyrite during early diagenesis. Pyrite mimics the laminated texture of the precursor grain, yet inclusions of silicate minerals and instances of partial replacement reveal the secondary nature of the pyrite. Pyrite ooids occur above erosion surfaces that are considered sequence boundaries because of large lateral extent. Chamositic precursor ooids indicate an oxygenated water column and wave interaction with seafloor sediments at the time of their formation. This scenario agrees with earlier work that stipulates that erosion surfaces in Devonian black shales reflect lowering of sea level that allowed wave reworking and erosion of earlier-deposited black shales. Pyrite ooid beds thus furnish direct evidence of significant sea-level drops during the accumulation of Upper Devonian black shales in eastern North America. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.