The sulfur isotope signatures of Marinoan deglaciation captured in Neoproterozoic shallow-to-deep cap carbonate from South China
The sulfur isotope signatures of Marinoan deglaciation captured in Neoproterozoic shallow-to-deep cap carbonate from South China
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华南新元古代浅至深碳酸盐岩中捕获的马里诺冰川消融的硫同位素特征
DOI：
10.1016/j.precamres.2013.09.002
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发表时间：
2013-11
影响因子：
3.8
通讯作者：
Huajin Chang
中科院分区：
文献类型：
--
作者：
Tao Sun;Lianjun Feng;Qirui Zhang;Huajin Chang
我们提出了高分辨率的硫和碳同位素记录从帽碳酸盐的陡山沱组，中国南方，一套独特的沉积相跨越一个明显的古海洋深度梯度。碳酸盐结合硫酸盐（CAS）的δ 34 S在陆架-陆坡深度样带上减小。深水陆坡剖面的δ 34 S主要受34 S富集的陆源输入的影响，而深水陆坡剖面的δ 34 S主要受34 S富集的陆源输入的影响。我们认为，陆源硫的输入主要来自前Marinoan大塘坡组的风化和侵蚀的冰川地面，然后在快速冰消期新鲜暴露。分布广泛的大塘坡组沉积于斯图尔阶和马里诺阶冰期之间，以其黄铁矿的δ 34 S值异常高而闻名。海洋中的低硫酸盐条件允许强烈的局部控制和随之而来的海水化学的不均匀性。后马里诺时代的海洋在冰川作用后立即分层，缺氧的深层沃茨上覆盖着含氧的融水层。在海侵过程中，浅水受到上升流的扰动。深水溶解有机碳（DOC）的氧化会导致13 C的短暂减少，而34 S在浅水沃茨中的富集。
We present high-resolution sulfur and carbon isotope records from the cap carbonate of the Doushantuo Formation, South China, a unique suite of depositional facies spanning across a pronounced paleo-oceanic depth gradient. Theδ34S of carbonate-associated sulfate (CAS) decreases across a shelf-to-slope depth transect. We propose that the deeper-water slope profile represents syn-glacial sulfur isotope compositions of the seawater sulfates with impact of34S-depleted hydrothermal sulfur inputs, while theδ34S of the shallow inner-shelf were dominantly controlled by the34S-enriched terrigenous input. We suggest that the terrigenous sulfur inputs were mainly from weathering and erosion of the pre-Marinoan Datangpo Formation—glacially ground and then freshly exposed during rapid deglaciation. The widespread Datangpo Formation, deposited between the Sturtian and Marinoan glacial intervals, is noted for the unusually highδ34S values of its pyrite.The low sulfate conditions in the ocean allowed for strong local controls and consequent heterogeneities in seawater chemistry. The post-Marinoan ocean was stratified in the immediate wake of glaciation, with anoxic deep waters overlain by an oxic, melt-water layer. During the transgression, the shallow water was disturbed by upwelling. The oxidation of dissolved organic carbon (DOC) from deep water would lead to transiently enhanced13C depletions but34S enrichments in the shallow waters.
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甲烷渗漏、甲烷水合物不稳定以及新元古代晚期冰后盖碳酸盐
DOI：
10.1007/s11434-006-1152-y
发表时间：
2006-05
期刊：
科学通报(英文版)
影响因子：
--
作者：
Shi Xiaoying;Jiang Ganqing;Zhang Shihong
通讯作者：
Zhang Shihong
影响因子：
5.8
作者：
Daniel C. Pope;S. Willett
通讯作者：
Daniel C. Pope;S. Willett
影响因子：
5.8
作者：
A. Draut;P. Clift
通讯作者：
A. Draut;P. Clift
影响因子：
2
作者：
G. Jiang;M. Kennedy;N. Christie‐Blick;Huaichun Wu;Shihong Zhang
通讯作者：
G. Jiang;M. Kennedy;N. Christie‐Blick;Huaichun Wu;Shihong Zhang
影响因子：
64.8
作者：
S. Sahoo;N. Planavsky;B. Kendall;Xinqiang Wang;Xiaoying Shi;C. Scott;A. Anbar;T. Lyons;G. Jiang
通讯作者：
S. Sahoo;N. Planavsky;B. Kendall;Xinqiang Wang;Xiaoying Shi;C. Scott;A. Anbar;T. Lyons;G. Jiang