Sulfur and carbon isotopic variations in Neoproterozoic sedimentary rocks from southern China
Sulfur and carbon isotopic variations in Neoproterozoic sedimentary rocks from southern China作者机构：Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China Key Laboratory for Mineral Resources Research，Chinese Academy of Sciences，Beijing 100029，China Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China
出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))
年 卷 期：2003年第11期
页 面：75-80页
学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学]
主 题：Neoproterozoic southern China sulfur isotopes carbon isotopes seawater secular variations.
摘 要：A new set of δ 34S sulfide, δ 34S sulfate and δ 13C carbonate values has been reported from Neoproterozoic sedimentary rocks in southern China. The interglacial black shales of the Datangpo Fm. display higher δ 34S sulfide values with +20‰ average, but the postglacial black shales from the Doushantuo Fm. show negative δ 34S sulfide values. However, the Jinjiadong Fm., the same post-glaciation as the Doushantuo Fm., has positive δ 34S sulfide values, implying that the δ 34S value of sedimentary sulfides would be controlled by lithofacies and paleogeographic environments. The δ 34S sulfate values relative to δ 13C carbonate were obtained by extraction of trace sulfate from the successive carbonate sequences in the Yangtze Gorges sections. A preliminary interpretation suggests that the oceanic environment may fluctuate dramatically at the post-glacial Doushantuo stage and, then, recover its stability at the Dengying stage on the basis of the high resolution δ 34S and δ 13C curves of seawater.
同方期刊数据库