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Gastropod carbonate δ18O and δ13C values record strong seasonal productivity and stratification shifts during the late Eocene in England

1997; Geological Society of America; Volume: 25; Issue: 10 Linguagem: Inglês

10.1130/0091-7613(1997)025 2.3.co;2

1943-2682

Louise Purton, Martin D. Brasier,

Marine and fisheries research

Research Article| October 01, 1997 Gastropod carbonate δ18O and δ13C values record strong seasonal productivity and stratification shifts during the late Eocene in England Louise Purton; Louise Purton 1Department of Earth Sciences, Parks Road, Oxford OX1 3PR, United Kingdom Search for other works by this author on: GSW Google Scholar Martin Brasier Martin Brasier 1Department of Earth Sciences, Parks Road, Oxford OX1 3PR, United Kingdom Search for other works by this author on: GSW Google Scholar Author and Article Information Louise Purton 1Department of Earth Sciences, Parks Road, Oxford OX1 3PR, United Kingdom Martin Brasier 1Department of Earth Sciences, Parks Road, Oxford OX1 3PR, United Kingdom Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1997) 25 (10): 871–874. https://doi.org/10.1130/0091-7613(1997)025 2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Louise Purton, Martin Brasier; Gastropod carbonate δ18O and δ13C values record strong seasonal productivity and stratification shifts during the late Eocene in England. Geology 1997;; 25 (10): 871–874. doi: https://doi.org/10.1130/0091-7613(1997)025 2.3.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 High-resolution δ18O and δ13C measurements obtained from the gastropod Clavilithes macrospira provide the most detailed record of seasonal change in temperature (range ∼14 °C), seawater chemistry, and bottom-water ventilation yet obtained from late Eocene strata (type Bartonian, ca. 40 Ma). The δ18O oscillations suggest a linear rate of long-term growth and rapid growth in spring–early summer. Coherence analysis shows that δ13C patterns vary from being closely in phase with respect to annual δ18O oscillations, to being antiphase, with a phase shift toward a spring, or more rarely, an autumnal δ13C peak. These patterns are attributed to unstable seasonal productivity and/or the development of a seston-rich bottom layer, in which the δ13C gradients arising from seasonal eutrophication were perturbed by spring storms. Such episodes may have led to the decline and extinction of oligotrophic marine biota with photosymbionts, including Nummulites, in the late Eocene. 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.