桂北中奥陶统升坪组黑色页岩沉积环境与有机质富集
Sedimentary Environment and Organic Matter Accumulation of Black Shale in Middle Ordovician Shengping Formation, Northern Guangxi
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为了探讨桂北中奥陶统升坪组黑色页岩沉积环境与有机质富集的关系,利用有机碳、主量元素、微量元素及碳同位素等地球化学方法,分析了广西北部全州县文桥镇溪水源剖面中奥陶统升坪组黑色页岩的古氧化还原条件、古生产力、热水沉积作用、碎屑注入及水体局限程度等古沉积环境.结果表明:升坪组下段以富泥硅质页岩为主,TOC含量为1.45%~3.04%;上段以硅质页岩为主,TOC含量为0.63%~2.69%.升坪组下段有机质来源为I型干酪根,上段有机质来源除了I型干酪根外,可能还有Ⅱ型干酪根的参与.升坪组沉积时期总体为贫氧‒厌氧的深水陆棚‒盆地相环境.下段富泥硅质页岩中有机质富集为“生产力”和“保存条件”的双控模式;上段硅质页岩中有机质富集为“保存条件”模式.
黑色页岩 / 沉积环境 / 有机质富集 / 升坪组 / 桂北地区 / 石油地质.
black shale / sedimentary environment / organic matter accumulation / Shengping Formation / northern Guangxi / petroleum geology
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湖南省自然科学基金项目(2023JJ30239)
湖南省教育厅资助科研项目(23B0467)
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