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• W2896572258 abstract "Research Article| October 08, 2018 Sr isotope ratios of modern carbonate shells: Good and bad news for chemostratigraphy S. El Meknassi; S. El Meknassi * 1Géosciences Environnement Toulouse (GET), Université de Toulouse, CNRS, IRD, UPS, F-31400 Toulouse, France *E-mail: sofia.elmeknassi@get.omp.eu Search for other works by this author on: GSW Google Scholar G. Dera; G. Dera 1Géosciences Environnement Toulouse (GET), Université de Toulouse, CNRS, IRD, UPS, F-31400 Toulouse, France Search for other works by this author on: GSW Google Scholar T. Cardone; T. Cardone 1Géosciences Environnement Toulouse (GET), Université de Toulouse, CNRS, IRD, UPS, F-31400 Toulouse, France Search for other works by this author on: GSW Google Scholar M. De Rafélis; M. De Rafélis 1Géosciences Environnement Toulouse (GET), Université de Toulouse, CNRS, IRD, UPS, F-31400 Toulouse, France Search for other works by this author on: GSW Google Scholar C. Brahmi; C. Brahmi 2Université de la Polynésie Française, UMR 241 EIO, Faa’a - Tahiti, French Polynesia Search for other works by this author on: GSW Google Scholar V. Chavagnac V. Chavagnac 1Géosciences Environnement Toulouse (GET), Université de Toulouse, CNRS, IRD, UPS, F-31400 Toulouse, France Search for other works by this author on: GSW Google Scholar Author and Article Information S. El Meknassi * 1Géosciences Environnement Toulouse (GET), Université de Toulouse, CNRS, IRD, UPS, F-31400 Toulouse, France G. Dera 1Géosciences Environnement Toulouse (GET), Université de Toulouse, CNRS, IRD, UPS, F-31400 Toulouse, France T. Cardone 1Géosciences Environnement Toulouse (GET), Université de Toulouse, CNRS, IRD, UPS, F-31400 Toulouse, France M. De Rafélis 1Géosciences Environnement Toulouse (GET), Université de Toulouse, CNRS, IRD, UPS, F-31400 Toulouse, France C. Brahmi 2Université de la Polynésie Française, UMR 241 EIO, Faa’a - Tahiti, French Polynesia V. Chavagnac 1Géosciences Environnement Toulouse (GET), Université de Toulouse, CNRS, IRD, UPS, F-31400 Toulouse, France *E-mail: sofia.elmeknassi@get.omp.eu Publisher: Geological Society of America Received: 13 Jul 2018 Revision Received: 20 Aug 2018 Accepted: 03 Sep 2018 First Online: 08 Oct 2018 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2018 Geological Society of America Geology (2018) 46 (11): 1003–1006. https://doi.org/10.1130/G45380.1 Article history Received: 13 Jul 2018 Revision Received: 20 Aug 2018 Accepted: 03 Sep 2018 First Online: 08 Oct 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation S. El Meknassi, G. Dera, T. Cardone, M. De Rafélis, C. Brahmi, V. Chavagnac; Sr isotope ratios of modern carbonate shells: Good and bad news for chemostratigraphy. Geology 2018;; 46 (11): 1003–1006. doi: https://doi.org/10.1130/G45380.1 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 The reconstruction of past variations in seawater strontium isotope ratios (87Sr/86Sr) from marine carbonate skeletons (MCSs) is based on the assumption that the Sr isotope composition of oceans is homogeneous worldwide. However, fossil materials are mainly from shelf domains whose modern Sr budget is known to be very sensitive to continental Sr fluxes. Their reliability as chemostratigraphic tools or weathering proxies may thus be questioned, especially because no formal appraisal of biological and environmental biases has been done on a global scale. Here, we provide new modern MCS 87Sr/86Sr values from various marine environments that we analyze statistically in regards to extensive compilations of MCS and water data. We show that most MCS 87Sr/86Sr values fall within the range of those of modern oceanic waters (0.709172 ± 23). Others, concerning ∼30% of studied localities, may display slight to considerable offsets compared to the 87Sr/86Sr signature of modern seawater (±250 × 10–6). These patterns mainly concern bivalves and gastropods, or more generally epibenthic and eurytopic organisms, from coastal domains with water mass restriction, low salinity, or strong continental supplies (fjords, lagoons, endorheic basins). Beyond classical fluvial freshwater influences, submarine groundwater discharges may lead to a less radiogenic 87Sr/86Sr signature of MCSs even in lagoons with euhaline conditions (e.g., Oualidia lagoon, Morocco). All biases considered, this calls for caution in relative dating, as we calculate that half the values of the Phanerozoic 87Sr/86Sr curve cannot provide time calibration accuracy better than ±3 m.y., which is necessary to discriminate the shorter stages. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2896572258 title "Sr isotope ratios of modern carbonate shells: Good and bad news for chemostratigraphy" @default.
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