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1. 中国石油化工股份有限公司江汉油田分公司勘探开发研究院
2. 中国石油化工股份有限公司江汉油田分公司
Published:2026
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陈兰朴, 郭战峰, 郑爱维, et al. 川东中二叠统茅口组硅质岩岩石学、地球化学特征及成因[J]. Bulletin of Geological Science and Technology, 2026, 45(1): 68-80.
陈兰朴, 郭战峰, 郑爱维, et al. 川东中二叠统茅口组硅质岩岩石学、地球化学特征及成因[J]. Bulletin of Geological Science and Technology, 2026, 45(1): 68-80. DOI: 10.19509/j.cnki.dzkq.tb20240243.
为明确上扬子东缘茅口组硅质岩的沉积环境、硅质来源及形成机理,以川东地区中二叠统茅口组硅质岩为研究对象,在详细的岩石学观察分析的基础上,开展硅质岩的主量元素、微量元素和稀土元素分析。结果表明:硅质岩的形成缺乏陆源物质的影响,其SiO
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主要来源于与二叠纪岩浆活动相关的热液流体,同时生物作用参与了硅质岩的形成;硅质岩的形成环境主要为靠近大陆边缘的台盆相间背景下相对缺氧的深水裂陷槽内及周缘的浅水台地,峨眉地幔柱上拱导致的基底深大断裂活化以及新形成的同沉积断裂为热液流体的上升运移提供了主要通道,热液流体在运移过程中与地壳的相互作用导致其具有壳、幔混源的特征;硅质岩形成于同沉积期或沉积后不久,主要表现为通过交代碳酸盐质组分的方式而形成,疏松多孔的介质条件有利于热液流体在沉积物中的流动并发生顺层交代或沉淀,热液流体的间歇性作用则导致不均匀硅化作用的发生。该研究成果提出了上扬子川东地区茅口组硅质岩成因的新观点,深化了中晚二叠世之交的古构造沉积演化认识,对该地区的天然气勘探部署具有重要的指导意义。
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