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地球学报  2008 

山东黄河北煤田石炭—二叠系太原组地层沉积特征

DOI: 10.3975/cagsb.2008.04.03

Keywords: 黄河北煤田,太原组,沉积环境,沉积相,粒度分析

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Abstract:

为了研究黄河北煤田的沉积特征,查清研究区内太原组地层的岩性类型、沉积构造、粒度分布特征,并进一步明确其沉积体系及沉积相的特征和沉积演化,本文根据野外露头的观察和室内岩心的描述、薄片分析,结合钻井、测井资料,运用沉积学、古生物地层学、层序地层学、岩石粒度分析等方法,对研究区的太原组地层沉积特征进行了详细的研究。结果表明:研究区石炭—二叠系的含煤地层太原组沉积物中砂岩、粉砂岩、泥岩、石灰岩及煤岩均较发育,常见的含铁矿物主要是褐铁矿、黄铁矿、菱铁矿等;主要层理构造有水平层理、平行层理、交错层理、波状层理、韵律层理等,生物扰动构造非常发育;主要的生物化石发育于台地相灰岩中,包括蜓类、牙形石等个体较大化石;主要发育植物化石有轮叶、科达木、宽带羊齿等;太原组沉积环境比较动荡,为河流相或者浅海相环境,其陆表海盆地层序及内部单元的典型界面有最大海泛面、区域性海退界面和最大海退面,并依据其不同界面,进行了沉积相划分和层序地层分析;研究区内晚石炭世的太原组地层为陆表海沉积序列,其沉积环境演化主要是由海陆交互相沉积向陆相沉积的转换。

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