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首页> 外文期刊>Journal of Asian earth sciences >Controls on U enrichment in organic-rich shales from the Triassic Yanchang Formation, Ordos Basin, Northern China
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Controls on U enrichment in organic-rich shales from the Triassic Yanchang Formation, Ordos Basin, Northern China

机译：从北方鄂尔多斯盆地鄂尔多斯盆地，鄂尔多斯盆地的富含有机富索富集的控制

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摘要

The Chang 7 lacustrine organic-rich shale in the Upper Triassic Yanchang Formation has high U contents, with a mean of 10.2 ppm. Previous studies have proposed that the redox conditions and high total organic carbon (TOC) content provide advantageous physical-chemical conditions for syngenetic U enrichment; however, the pro-cesses, mechanisms, and factors controlling U enrichment are still unclear. In this study, we examined the re-lationships between TOC and major, and trace element concentrations to better understand the factors that control U enrichment. Results indicate that U enrichment in the Chang 7 organic-rich shale is mainly controlled by redox conditions, sources of U, and sedimentation rate. Under oxic conditions, U is predominantly enriched in authigenic phosphate nodules; however, under anoxic conditions, it is mainly enriched in organic matter. Therefore, organic matter plays a more important role in controlling U enrichment than once thought due to its high content in the Chang 7 organic-rich shale, although the authigenic phosphate nodules have a higher enrichment efficiency. In addition to favorable redox conditions, deep hydrothermal fluids and volcanic ash can provide sources for U, and low sedimentation rate during shale deposition may create an environment conducive to U enrichment. The results of this study provide critical information about U enrichment in organic-rich shales and provide guidance for further research on the coexistence of U enrichment and high organic matter contents in source rocks.
机译：张7湖水型有机富含页岩在上三叠系延长地层中具有高U含量，平均为10.2ppm。以前的研究提出了氧化还原条件和高总有机碳（TOC）含量为合成的U富集提供有利的物理化学条件;然而，控制U富集的亲疾病，机制和因素仍然不清楚。在这项研究中，我们研究了TOC和主要的重新关系，以及痕量元素浓度，以更好地了解控制U富集的因素。结果表明，常7有机富含物的富集主要受氧化还原条件，U的来源和沉降率控制。在氧化条件下，U主要富集在磷酸盐结节中;然而，在缺氧条件下，它主要富集有机物。因此，有机物在控制U富集的浓缩中起着更重要的作用，这是由于其在常7种有机型页岩中的高含量，尽管Authigenic磷酸盐结节具有更高的富集效率。除了有利的氧化还原条件外，深水温流体和火山灰可以为U提供源，并且页岩沉积期间的沉降率可能会产生有利于富集的环境。这项研究的结果提供富含有机质的页岩部分U富集的关键信息和关于U富集和烃源岩高有机质含量并存的进一步研究提供指导。

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