Carbon and nitrogen isotope disturbances and an end-Norian (Late Triassic) extinction event

Abstract

Research Article| December 01, 2002 Carbon and nitrogen isotope disturbances and an end-Norian (Late Triassic) extinction event Mark A. Sephton; Mark A. Sephton 1Planetary and Space Sciences Research Institute, Open University, Milton Keynes MK7 6AA, UK Search for other works by this author on: GSW Google Scholar Ken Amor; Ken Amor 2School of Earth Sciences, University of Leeds, Leeds LS2 9JT, UK Search for other works by this author on: GSW Google Scholar Ian A. Franchi; Ian A. Franchi 3Planetary and Space Sciences Research Institute, Open University, Milton Keynes MK7 6AA, UK Search for other works by this author on: GSW Google Scholar Paul B. Wignall; Paul B. Wignall 4School of Earth Sciences, University of Leeds, Leeds LS2 9JT, UK Search for other works by this author on: GSW Google Scholar Robert Newton; Robert Newton 4School of Earth Sciences, University of Leeds, Leeds LS2 9JT, UK Search for other works by this author on: GSW Google Scholar John-Paul Zonneveld John-Paul Zonneveld 5Geological Survey of Canada, 3303-33rd Street Northwest, Calgary, Alberta T2l 2A7, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Mark A. Sephton 1Planetary and Space Sciences Research Institute, Open University, Milton Keynes MK7 6AA, UK Ken Amor 2School of Earth Sciences, University of Leeds, Leeds LS2 9JT, UK Ian A. Franchi 3Planetary and Space Sciences Research Institute, Open University, Milton Keynes MK7 6AA, UK Paul B. Wignall 4School of Earth Sciences, University of Leeds, Leeds LS2 9JT, UK Robert Newton 4School of Earth Sciences, University of Leeds, Leeds LS2 9JT, UK John-Paul Zonneveld 5Geological Survey of Canada, 3303-33rd Street Northwest, Calgary, Alberta T2l 2A7, Canada Publisher: Geological Society of America Received: 10 May 2002 Revision Received: 05 Aug 2002 Accepted: 08 Aug 2002 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2002) 30 (12): 1119–1122. https://doi.org/10.1130/0091-7613(2002)030<1119:CANIDA>2.0.CO;2 Article history Received: 10 May 2002 Revision Received: 05 Aug 2002 Accepted: 08 Aug 2002 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Mark A. Sephton, Ken Amor, Ian A. Franchi, Paul B. Wignall, Robert Newton, John-Paul Zonneveld; Carbon and nitrogen isotope disturbances and an end-Norian (Late Triassic) extinction event. Geology 2002;; 30 (12): 1119–1122. doi: https://doi.org/10.1130/0091-7613(2002)030<1119:CANIDA>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 Major perturbations of organic carbon and nitrogen isotope ratios from a Norian-Rhaetian (Late Triassic) boundary section in British Columbia coincide with an extinction of the dominant, deep-water invertebrate fauna of the Late Triassic (monotids and most ammonoids). The carbon isotope excursion is attributed to the development of widespread oceanic stagnation that favored organic-rich shale deposition. The coincident nitrogen isotope excursion suggests that progressively more nitrate-limited productivity forced a change to nitrogen-fixing cyanobacteria populations as ocean stagnation created nutrient-starved conditions. The biotic crisis and geochemical events of the Norian-Rhaetian boundary predate the latest Rhaetian (end-Triassic) mass extinction. Thus, the Late Triassic interval was marked by more than one extinction event. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.