Carbon and oxygen isotope stratigraphy of the Lower Mississippian (Kinderhookian–lower Osagean), western United States: Implications for seawater chemistry and glaciation

Research Article| January 01, 2002 Carbon and oxygen isotope stratigraphy of the Lower Mississippian (Kinderhookian–lower Osagean), western United States: Implications for seawater chemistry and glaciation Matthew R. Saltzman Matthew R. Saltzman 1Department of Geological Sciences, Ohio State University, Columbus, Ohio 43210, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Matthew R. Saltzman 1Department of Geological Sciences, Ohio State University, Columbus, Ohio 43210, USA Publisher: Geological Society of America Received: 05 Apr 2001 Revision Received: 29 May 2001 Accepted: 23 Aug 2001 First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2002) 114 (1): 96–108. https://doi.org/10.1130/0016-7606(2002)114<0096:CAOISO>2.0.CO;2 Article history Received: 05 Apr 2001 Revision Received: 29 May 2001 Accepted: 23 Aug 2001 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 Matthew R. Saltzman; Carbon and oxygen isotope stratigraphy of the Lower Mississippian (Kinderhookian–lower Osagean), western United States: Implications for seawater chemistry and glaciation. GSA Bulletin 2002;; 114 (1): 96–108. doi: https://doi.org/10.1130/0016-7606(2002)114<0096:CAOISO>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 A positive carbon isotope (δ13C) excursion has been recognized in upper Kinderhookian and early Osagean carbonates in three sections in southeast Idaho and Nevada. The oldest δ13C peak (+7‰) is dated to the isosticha conodont zone, and a younger peak occurs in the typicus Zone. The shifts are recorded in a range of carbonate lithofacies representing various water depths along the shelf. Lithofacies sampled for δ13C and δ18O at the Samaria Mountain section in southeast Idaho record the shallowest-water conditions, indicated by cross- bedded skeletal and peloidal grainstones. The deepest water conditions are present in the Pahranagat Range section in eastern Nevada, which consists mainly of bioturbated lime mudstone and skeletal wackestone. The δ13C values from these widely separated sedimentary basins show a consistent trend that correlates with Early Mississippian curves generated from brachiopod calcite in western Europe and the Midcontinent of North America, as well as dolomites in Utah and Wyoming. δ18O values become more positive up section, generally paralleling the positive trend in δ13C during the late Kinderhookian. No subaerial exposure surfaces are recognized in the sections examined in southeast Idaho and Nevada, and at least the δ13C trends are interpreted as primary seawater fluctuations. Sea-level changes occurred near the beginning of the late Kinderhookian δ13C shift (early to middle parts of the isosticha Zone) and within the peak of the δ13C excursion (Kinderhookian-Osagean boundary), although tectonic changes associated with the Antler orogeny have likely modified the eustatic signature. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.