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首页> 外文期刊>Oceanographic Literature Review >Geochemical characteristics of the Upper Devonian Shetianqiao Formation in the Shaoyang sag of Xiangzhong depression from Middle Yangtze area, South China: Implications for the depositional environment and organic matter enrichment
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Geochemical characteristics of the Upper Devonian Shetianqiao Formation in the Shaoyang sag of Xiangzhong depression from Middle Yangtze area, South China: Implications for the depositional environment and organic matter enrichment

机译：湘中地区邵阳坳陷邵阳凹陷中探空落下的地球化学特征：沉积环境与有机物质浓缩的影响

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摘要

The formation and preservation conditions of the organic matter (OM) in the Upper Devonian Shetianqiao Formation were investigated to assess the mechanism of the OM enrichment in the shale in the Shaoyang sag. The total organic carbon (TOC) contents of the shale range from 0.2% to 4.4%. The shale can be divided into three intervals. The terrestrial input during Interval 2, as indicated by the Al_2O_3 and Ti proxies, was relatively small. The chemical alteration index (CIA) shows that the Shetianqiao Formation mainly formed in a warm and humid climate, however, climate cooling occurred in Interval 2. Intervals 1 and 3 were mainly deposited in a restricted environment, whereas Interval 2 experienced upwelling. The climate cooling may have been the driver for the upwelling. The U_(EF), Mo_(EF), and Mo-U covariation diagrams indicate that Interval 2 was mainly deposited under reducing conditions, whereas Intervals 1 and 3 were chiefly formed in an oxidizing environment. The Cu/Al ratios and excess Si (Sixs) suggest that Interval 2 was formed in significantly higher marine productivity than Intervals 1 and 3. The plot of Co (ppm) × Mn (%) versus Cd/Mo, the logarithmic relationship between Co (ppm) × Mn (%) and TOC, and the good correlations between TOC and the productivity proxies suggest that productivity was the primary factor for the OM enrichment. We constructed a depositional model that emphasizes the control of productivity driven by upwelling on the OM enrichment.
机译：研究了上探索中牧草性桥肺肿的有机物质（OM）的形成和保存条件，以评估邵阳凹陷的页岩浓缩的机制。页岩的总有机碳（TOC）含量为0.2％至4.4％。页岩可以分为三个间隔。间隔2期间的地面输入，如AL_2O_3和TI代理所示相对较小。化学改变指数（CIA）表明，采用潮湿的气候中主要形成的ShetianQiao形成，然而，间隔2发生的气候冷却。间隔1和3主要沉积在限制环境中，而间隔2则经历了升值。气候冷却可能是升值的驾驶员。 U_（EF），MO_（EF）和MO-U变焦图表明间隔2主要沉积在还原条件下，而间隔1和3主要形成在氧化环境中。 Cu / Al比率和过量的Si（六个）表明，间隔2形成于比间隔1和3的间隔提高的母船生产力。CO（PPM）×Mn（％）与CD / Mo的图，CO之间的对数关系（PPM）×Mn（％）和TOC，TOC与生产率代理之间的良好相关性表明，生产力是OM富集的主要因素。我们构建了一种沉积模型，强调通过升温的提升驱动的生产力控制。

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    《Oceanographic Literature Review》 |2021年第6期|1264-1265|共2页
  • 作者

    L. Chen; B. Zhang; S. Jiang;

  • 作者单位

    Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences) Ministry of Education Wuhan 430074 China;

    Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences) Ministry of Education Wuhan 430074 China;

    Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences) Ministry of Education Wuhan 430074 China;

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