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

被引：19

作者：

Findlater, Genevive ^{[1
]}

Shelton, Adam ^{[1
]}

Rolin, Timothy ^{[1
]}

Andrews, Julian ^{[1
]}

机构：

[1] Univ E Anglia, Sch Environm Sci, Norwich NR4 7TJ, Norfolk, England

来源：

PROCEEDINGS OF THE GEOLOGISTS ASSOCIATION | 2014年 / 125卷 / 01期

关键词：

Sodium; Strontium; Mollusc shells; Palaeosalinity; Pleistocene; GEOCHEMISTRY; SALINITY; SEDIMENTS; NORFOLK; OXYGEN;

D O I：

10.1016/j.pgeola.2013.10.005

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

This 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 'eastern England' seawater temperatures were broadly similar to those of the modern North Sea. (C) 2013 The Geologists' Association. Published by Elsevier Ltd. All rights reserved.

引用

页码：14 / 19

页数：6

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