Lower Triassic sulphur isotope curve of marine sulphates from the Dolomites, N-Italy
Lower Triassic sulphur isotope curve of marine sulphates from the Dolomites, N-Italy
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DOI：
10.1016/j.palaeo.2010.02.016
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发表时间：
2010-04-15
影响因子：
3
通讯作者：
Povoden-Karadeniz, Erwin
中科院分区：
文献类型：
--
作者：
Horacek, Micha;Brandner, Rainer;Povoden-Karadeniz, Erwin
在南阿尔卑斯山海相碳酸盐岩剖面采集了二叠纪末期至下三叠世末期的 6 个蒸发岩样品。确定硫酸盐的硫同位素比是为了了解调查期间海洋三角洲S-34比值的变化，从文献中得知，下三叠统三角洲S-34值发生了从贫化到重富的深刻变化。对来自同一部分的碳酸盐的碳同位素模式进行了分析。由于下三叠统的碳同位素曲线具有非常明显的模式，因此可以确定剖面中蒸发岩层的地层位置，因此可以表明δ S-34的变化已经发生在Dienerian-Smithian边界或Dienerian内。海水的分层和重新混合是对观测到的同位素模式最合理的解释。 (c) 2010 Elsevier B.V. 保留所有权利。
6 evaporite samples from the latest Permian to the late Lower Triassic have been sampled at marine carbonate sections in the Southern Alps. The sulphur isotope ratio of the sulphate has been determined to learn about the changes of the marine delta S-34 ratio during the investigated period, as it is known from the literature that a profound change from depleted to heavily enriched delta S-34 values occurred within the Lower Triassic. The carbonates from the same sections have been analysed for their carbon isotope pattern. As the carbon isotope curve of the Lower Triassic has a very distinct pattern it enables the stratigraphic location of the evaporite layers in the section, thus it can be shown that the change in delta S-34 already occurred at the Dienerian-Smithian boundary or within the Dienerian. Stratification and re-mixing of ocean water are the most plausible interpretations for the observed isotope patterns. (c) 2010 Elsevier B.V. All rights reserved.