The oxygen isotope stratigraphic record of the Late Pleistocene
The oxygen isotope stratigraphic record of the Late Pleistocene
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晚更新世氧同位素地层记录
DOI：
10.1098/rstb.1977.0104
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发表时间：
1977
期刊：
影响因子：
--
通讯作者：
N. Shackleton
中科院分区：
文献类型：
--
作者：
N. Shackleton
对60多个深海沉积物岩心的有孔虫进行了氧同位素测量。与Emiliani发表的加勒比海和赤道大西洋岩心的氧同位素测量结果一起，这构成了一个独特的地层数据体，涵盖了整个世界海洋中大多数重要的钙质沉积物区域。晚更新世沉积物岩芯中有孔虫的氧同位素组成在几乎所有地区都以类似的方式变化;这些变化反映了海洋氧同位素组成的变化。海洋在大约1 ka的时间里发生了混合，因此，由于大陆上储存的冰量的波动，海洋同位素的变化在所有地区几乎是同步发生的。因此，氧同位素记录为地层对比提供了极好的手段。以超过5 cm/ka的速率积累的岩心提供了氧同位素组成变化的记录，这些变化几乎不受沉积后沉积物混合的影响。因此，它们保存了北方冰块进退的详细记录，并为冰盖动力学研究提供了独特的信息来源。
Oxygen isotope measurements have been made in foraminifera from over 60 deep-sea sediment cores. Taken together with the oxygen isotope measurements published by Emiliani from Caribbean and Equatorial Atlantic cores, this comprises a unique body of stratigraphic data covering most of the important areas of calcareous sediment over the whole world ocean. The oxygen isotopic composition of foraminifera from cores of Late Pleistocene sediment varies in a similar manner in nearly all areas; the variations reflect changes in the oxygen isotopic composition of the ocean. The oceans are mixed in about 1 ka so that ocean isotopic changes, resulting from fluctuations in the quantity of ice stored on the continents, must have occurred almost synchronously in all regions. Thus the oxygen isotope record provides an excellent means of stratigraphic correlation. Cores accumulated at rates of over about 5 cm/ka provide records of oxygen isotopic composition change that are almost unaffected by post-depositional mixing of the sediment. Thus they preserve a detailed record of the advance and retreat of the ice masses in the northern hemisphere, and provide a unique source of information for the study of ice-sheet dynamics.