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首页> 外文期刊>Journal of Asian earth sciences >Mo-Ni and organic carbon isotope signatures of the mid-late Mesoproterozoic oxygenation
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Mo-Ni and organic carbon isotope signatures of the mid-late Mesoproterozoic oxygenation

机译：中晚期中生代氧的Mo-Ni和有机碳同位素特征

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This study performed a redox sensitive trace element (RSTE) and organic carbon isotope investigation on the shallow section of similar to 1.2 Ga Bijaigarh Shale, Kaimur Group, Vindhyan Supergroup. The results demonstrate that unlike the coeval deeper section, in which Mo and Ni concentrations are several-folds higher compared to the upper continental crust (UCC), the shallow section contains Mo and Ni equivalent to the upper continental crust (UCC). This spatially heterogeneous burial of Mo and Ni is very similar to the modern stratified basins i.e., Black Sea and Cariaco Basin, where Ni and Mo composition of the sediments underlying a shallow oxic water column is comparable to the UCC however, the deeper sediments underlying the anoxic/euxinic contains several foldshigher Mo and Ni compared to the UCC. Bulk precipitation of Mo in a hydrosphere is mainly controlled by sulphide present in the anoxic/euxinic layers of the water column, on the other hand, Ni precipitation is generally controlled by oxygenic primary productivity. Though the shallow section of the Bijaigarh Shale is depleted in Ni, a significant correlation between Ni and TOC is still relevant and indicates an oxygen-rich surface water layer for the respective palaeohydrosphere. Furthermore, delta C-13-org values (between -32.0 and -30.4 parts per thousand) from the shallow section suggests that the organic carbon exported into the sediments during the Bijaigarh Shale deposition was primarily derived from oxygenic photosynthesis in the concurrent surface water layers.
机译：本研究在与Vingayan Supergroup的Kaimur组的1.2 Ga Bijaigarh页岩相似的浅段进行了氧化还原敏感的痕量元素（RSTE）和有机碳同位素研究。结果表明，与中世纪较深的剖面不同，在该剖面的较深的剖面中，Mo和Ni的浓度比上部大陆壳（UCC）高出几倍，而较浅的剖面包含的Mo和Ni等于上部大陆壳（UCC）。 Mo和Ni的这种空间异质性埋藏与现代分层盆地非常相似，即黑海盆地和Cariaco盆地，其中浅氧化水柱下的沉积物的Ni和Mo组成与UCC相当，但是，与UCC相比，缺氧/富余酸的Mo和Ni含量高出几倍。 Mo在水圈中的大量沉淀主要受水柱缺氧/富氧层中存在的硫化物控制，另一方面，Ni沉淀通常由有氧初级生产力控制。尽管Bijaigarh页岩的浅层部分富含Ni，但Ni与TOC之间的显着相关性仍然有意义，并且表明各个古水圈的富氧地表水层。此外，浅水区的δC-13-org值（在千分之32.0和-30.4之间）表明，在Bijaigarh页岩沉积过程中输出到沉积物中的有机碳主要来自同时存在的地表水层中的光合作用。

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