Sodium and strontium in mollusc shells: preservation, palaeosalinity and palaeotemperature of the Middle Pleistocene of eastern England
  • 【DOI】

    10.1016/j.pgeola.2013.10.005

  • 【摘要】

    AbstractThis paper revisits the utility of sodium (Na) content in aragonite and calcite mollusc shells as an indicator of palaeosalinity. The data come mainly from a related suite of Middle Pleistocen... 展开>>AbstractThis paper revisits the utility of sodium (Na) content in aragonite and calcite mollusc shells as an indicator of palaeosalinity. The data come mainly from a related suite of Middle Pleistocene marine and freshwater fossils that have been subject to broadly similar diagenetic histories. Environmental salinity is re-affirmed as the primary factor in determining the sodium content of modern and ancient mollusc shells: values <2000?ppm Na are generally indicative of non-marine environments while values >2000?Na?ppm are typically from marine shells. There is a positive relationship between Na (salinity) and Sr which is a helpful discriminator of palaeosalinity in the fossil data set. The Na and Sr data give confidence that the fossil shells have not suffered pervasive diagenetic alteration and that the marine fossils lived in fully marine conditions. Oxygen isotope values in the best-preserved, fully marine fossil shells, suggest Middle Pleistocene 鈥榚astern England鈥?seawater temperatures were broadly similar to those of the modern North Sea. 收起<<

  • 【作者】

  • 【刊期】

    Proceedings of the Geologists' Association 2014年1期

  • 【语种】

    eng