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首页> 外文期刊>Australian Journal of Earth Sciences >Geochemistry and sedimentology of the Upper Ordovician-lower Silurian black shale in the northern margin of the Upper Yangtze Platform, South China: implications for depositional controls on organic-matter accumulation
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Geochemistry and sedimentology of the Upper Ordovician-lower Silurian black shale in the northern margin of the Upper Yangtze Platform, South China: implications for depositional controls on organic-matter accumulation

机译：南华南部北边缘上奥陶涅师 - 下硅子黑色页岩地球化学与沉积学：对有机物质积累的沉积控制的影响

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Organic-rich black shales from the Upper Yangtze Platform from the Upper Ordovician and lower Silurian are considered excellent source rocks and unconventional reservoirs of hydrocarbons in South China. This research combined geochemical analyses and detailed sedimentological observations to investigate the depositional controls on organic-matter abundance in the prolific black mudstone of the Wufeng Formation and Long-1 Member of the lower Silurian Longmaxi. Six primary lithofacies deposited at variable marine water depths and under different water column chemistries were identified from a similar to 50 m-long profile based on microscopic observations of sediment texture and structure, and analyses of total organic carbon (TOC) content, major and trace-element abundances, and pyrite framboid size. Our results showed that TOC content is strongly correlated with terrigenous SiO2 content and the non-detrital components of V, U and Mo, suggesting that the accumulation of organic matter in the studied shale was controlled by terrigenous clast fluxes and anoxic water conditions. However, the weak covariance relationship between TOC content and productivity proxies, including P/Ti and Ba/Al, demonstrates that the accumulation of organic matter was not controlled by primary productivity. The three high-productivity lithofacies of the Wufeng Formation and Long-1 Member have low Co*Mn values, indicating active marine upwelling during sedimentary periods. The northern margin of the Upper Yangtze Platform was an open basin system influenced by the Kwangsian Orogeny and global sea-level changes, but oxygen-depleted bottom waters in the basin favoured the accumulation and preservation of sedimentary organic matter, resulting in the formation of organic-rich black shales.
机译：来自上奥陶器和下艾尔建筑的上长江平台的有机丰富的黑色Shales被认为是华南地区的优秀源岩和非传统水库。该研究组合了地球化学分析和细致的沉积学观察，研究了武力地层的多产黑泥岩中有机物质丰度的沉积对照和下硅氏龙马的长1成员。六次沉积在可变海水深度和不同水柱化学下的主要岩型，基于沉积物纹理和结构的微观观察，以及分析总有机碳（TOC）含量，主要和痕迹 - 对丰满的丰富和硫铁矿富峰尺寸。我们的研究结果表明，TOC含量与人民2含量强烈相关，V，U和MO的非滴乳组分，表明研究的页岩中有机物质的积累受到植物裂纹丝液和缺氧水条件。然而，TOC含量和生产率代理之间的弱协方差关系，包括P / Ti和Ba / Al，表明有机物质的积累不受初级生产率的控制。武力地层的三个高生产率锂缺乏率，长1个成员具有低CO * MN值，表明沉积期间的活跃海洋上升量。上扬子平台的北边缘是受夸莲洋葱和全球海平变化影响的开放式盆地系统，但盆地中的氧气耗尽底部水域有利于沉积有机物的积累和保存，从而形成有机的形成 - 黑人士拉。

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