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作 者:张健雅 于海成 张华 ZHANG Jianya;YU Haicheng;ZHANG Hua(Hebei Provincial Coal Geological Exploration Institute,Xingtai,Hebei 054000)
出 处:《中国煤炭地质》2024年第9期15-20,25,共7页Coal Geology of China
基 金:河北省煤田地质局大专项“开平向斜煤系地层综合气资源潜力调查评价”。
摘 要:沉积地层中的地球化学元素特征对沉积古环境分析具有良好的指示作用。以开平向斜二叠系含煤地层沉积环境分析为目标,基于泥页岩样品中主、微量元素,系统研究物源特征、古气候、古盐度、古生产力及古氧化还原条件,包括Zr/Al、Ti/Al、古气候指数C、Sr/Ba、P/Ti、U/Th、MoEF、UEF、V/(V+Ni)等指标,探讨沉积古地理环境。结果表明:赵各庄组为碳酸盐岩台地、潮坪、泥炭沼泽以及潟湖相沉积,大苗庄组为三角洲沉积体系;构造背景为大陆岛弧和活动—被动大陆弧边缘区域。砂岩和泥页岩的交替表明,具有频繁的海水振荡特征,水动力条件频繁变化,整体上处于富氧状态、半潮湿气候、半咸水环境,有机质在较低的古生产力期间积累。The characteristics of geochemical elements in sedimentary strata have a good indication for the analysis of sedimentary paleoenvironment.Based on the main and trace elements in the shale samples,the provenance characteristics,paleoclimate,paleosalinity,paleoproductivity and paleoredox conditions are studied systematically,including Zr/Al,Ti/Al,paleoclimate index C,Sr/Ba,P/Ti,U/Th,MoEF,UEF,V/(V+Ni)and other indicators to explore the sedimentary paleogeographic environment.The results show that formation of Zhaogezhuang is carbonate platform,tidal flat,peat swamp and lagoon facies deposits,and formation of Damiaozhuang is delta sedimentary system.The tectonic setting is continental island arc and active-passive continental arc margin area.The alternation of sandstone and shale shows that it has the characteristics of frequent seawater oscillation and frequent changes in hydrodynamic conditions.On the whole,it is in an oxygen-rich state,semi-humid climate and brackish water environment,and organic matter accumulates during the period of low paleoproductivity.
分 类 号:P54[天文地球—构造地质学]
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