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Mg/Ca-temperature and seawater-test chemistry relationships in the shallow-dwelling large benthic foraminifera Operculina ammonoides

Evans, David ; Erez, Jonathan ; Oron, Shai ; Müller, Wolfgang

Geochimica et Cosmochimica Acta, 01 January 2015, Vol.148, pp.325-342 [Rivista Peer Reviewed]

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  • Titolo:
    Mg/Ca-temperature and seawater-test chemistry relationships in the shallow-dwelling large benthic foraminifera Operculina ammonoides
  • Autore: Evans, David ; Erez, Jonathan ; Oron, Shai ; Müller, Wolfgang
  • Descrizione: The foraminifera Mg/Ca palaeothermometer contributes significantly to our understanding of palaeoceanic temperature variation. However, since seawater Mg/Ca has undergone large secular variation and the relationship between seawater and test Mg/Ca has not been calibrated in detail for any species with a substantial fossil record, it is only possible to assess relative temperature changes in pre-Pleistocene fossil samples. In order to establish the basis of accurate quantitative Mg/Ca-derived deep-time temperature reconstructions, we have calibrated the relationship between test Mg/Ca, seawater chemistry and temperature in laboratory cultures of the shallow-dwelling large benthic species Operculina ammonoides. Operculina has a fossil range extending back to the early Paleogene and is the nearest living relative of the abundant genus Nummulites. We find a temperature sensitivity of 1.7%°C−1 and a linear relationship between the Mg distribution coefficient and seawater Mg/Ca (Mg/Casw)...
  • Fa parte di: Geochimica et Cosmochimica Acta, 01 January 2015, Vol.148, pp.325-342
  • Soggetti: Geology
  • Lingua: Inglese
  • Identificativo: ISSN: 0016-7037 ; E-ISSN: 1872-9533 ; DOI: 10.1016/j.gca.2014.09.039

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