The sulfur isotopic evolution of Phanerozoic seawater based on the analysis of structurally substituted sulfate in carbonates
The sulfur isotopic evolution of Phanerozoic seawater based on the analysis of structurally substituted sulfate in carbonates
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DOI：
10.1016/j.chemgeo.2003.11.013
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发表时间：
2004-04-15
期刊：
影响因子：
3.9
通讯作者：
Strauss, H
中科院分区：
文献类型：
--
作者：
Kampschulte, A;Strauss, H
对156个生态方解石和96个古生代和中生代全岩碳酸盐样品进行了硫同位素组成分析。记录在方解石晶格中的结构取代硫酸盐(SSS)中，硫同位素组成被认为反映了周围海水硫酸盐的硫同位素价值。对信号的可能变化进行了评估，证实了这种方法的有效性和所产生的时间记录的可靠性。新的硫同位素数据大大增强了我们对显生宙期间全球硫循环长期变化的了解。特别是对于古生代，在地层约束良好的样品中对SSS进行了177次新的测量，提供了一致和详细的数据集。这一点通过75个三角洲(34)S(SSS)测量延伸到整个中生代，主要是生物源方解石。观察到海水硫酸盐硫同位素组成的长期变化和短期振荡，被认为反映了硫化物埋藏分数的变化。我们对碳酸盐中结构取代硫酸盐的新的硫同位素数据，以及新生代有孔虫和海相重晶石的补充数据，为显生宙海水硫酸盐的硫同位素组成提供了新的时间记录。这一新记录在连续性和时间分辨率方面优于目前可用的数据集，应该会在未来对地球系统演化的考虑中取而代之。(C)2004爱思唯尔B.V.保留所有权利。
One hundred fifty-six biogenic calcites and 96 whole rock carbonate samples of Paleozoic and Mesozoic age have been analysed for their sulfur isotopic composition. Recorded in structurally substituted sulfate (SSS) in the calcite lattice, the sulfur isotopic composition is thought to reflect the sulfur isotope value of ambient seawater sulfate. Possible alterations of the signal have been assessed, confirming the validity of this approach and the reliability of the resulting temporal record.The new sulfur isotope data substantially enhances our knowledge about secular variations of the global sulfur cycle during the Phanerozoic. Specifically for the Paleozoic, 177 new measurements of SSS in stratigraphically well-constrained samples provide a coherent and detailed dataset. This is extended through the entire Mesozoic via 75 measurements Of delta(34)S(SSS), largely for biogenic calcites. Long-term changes and short-term oscillations in the sulfur isotopic composition of seawater sulfate have been observed, which are thought to reflect changes in the fractional burial of sulfide sulfur.Our new sulfur isotope data measured for structurally substituted sulfate in carbonates, and additional data from Cenozoic foraminifera and marine barites, provide a new temporal record for the sulfur isotopic composition of Phanerozoic seawater sulfate. This new record is superior in its continuity and time resolution to currently available datasets and should replace them in future considerations of Earth System Evolution. (C) 2004 Elsevier B.V. All rights reserved.