LAND-SEA CORRELATIONS IN THE PLEISTOCENE BASED ON ISOLEUCINE EPIMERIZATION IN NON-MARINE MOLLUSKS
LAND-SEA CORRELATIONS IN THE PLEISTOCENE BASED ON ISOLEUCINE EPIMERIZATION IN NON-MARINE MOLLUSKS
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DOI：
10.1038/340049a0
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发表时间：
1989-07-06
期刊：
影响因子：
64.8
通讯作者：
MILLER, GH
中科院分区：
文献类型：
--
作者：
BOWEN, DQ;HUGHES, S;MILLER, GH
海洋氧同位素地层学与大陆地层学的对比是第四纪研究的主要挑战之一。然而，大多数大陆分类是基于早于最近进展的技术和假设。尽管如此，深海氧同位素全球地层格架已通过一些长层序1扩展到大陆;但这些都是例外，区域地质与氧同位素信号的相关性分类并不令人满意。由于连续的地质事件产生了类似的证据（同向性），地质年代测定对于相关性至关重要，但现有的方法具有高度的地点，区域或样本特异性。幸运的是，非海洋软体动物在时间和空间上无处不在，在这里，我们使用这些化石中L-异亮氨酸的时间依赖性差向异构化来细分不列颠群岛的更新世，并识别出比现有分类所识别的更多的事件。通过用独立的测年方法校准相对氨基地层规模，我们建立了一个地质年代学，这是海陆对比的基础，可以追溯到氧同位素第15阶段。
THE correlation between the oxygen isotope stratigraphy of the oceans and continental stratigraphic records is one of the main challenges for Quaternary research. Most continental classifications, however, are based on techniques and hypotheses that predate recent advances. Nevertheless, the deep-sea oxygen isotope global stratigraphic framework has been extended to the continents by means of some long sequences1; but these are exceptional and regional geology is unsatisfactorily classified for correlation with the oxygen isotope signal. Because successive geological events produced similar evidence (homotaxis), geochronometric dating is essential for correlation, but available methods are highly site-, regional- or sample-specific. Fortunately non-marine molluscs are ubiquitous in time and space, and here we use the time-dependent epimerization of L-isoleucine in these fossils to subdivide the Pleistocene of the British Isles, and to identify more events than recognized by the existing classification2. By calibrating the relative aminostratigraphic scale with independent dating methods we have set up a geochronology which is the basis for land—sea correlations back to oxygen isotope stage 15.