贵州水城地区早二叠世包磨山组碳酸盐岩微相特征及沉积环境

贵州水城地区早二叠世包磨山组碳酸盐岩微相特征及沉积环境龙建喜;陈建书;彭成龙;潘明;龚桂源
【期刊名称】《中国岩溶》
【年(卷),期】2017(036)003
【摘要】水城地区包磨山组地层比较发育,岩性主要由一套碳酸盐岩夹细碎屑岩组成,碳酸盐岩横向结构变化较大.文章对水城地区自西向东实测7条相关剖面,通过系统采样300余件,室内制作岩石薄片鉴定,碳酸盐岩归纳为6个微相:有丰富有孔虫或藻类的颗粒灰岩/灰泥质颗粒石灰岩(SMF18)、有骨骼颗粒的生屑灰泥质颗粒石灰岩/颗粒质灰泥石灰岩(SMF10)、核形石砾屑碳酸盐岩/颗粒灰岩(SMF13)、海百合富集的石灰岩(SMF12-CRIN)、包壳的生屑颗粒(SMF11)、藻粘结灰岩(SMF7).通过对比不同剖面碳酸盐岩结构特征、生物组合特征及水动力能量特征,总体反映了水城地区包磨山组时期沉积环境横向上自南西向北东由开阔台地→局限台地过渡,垂向上经历了至少3次向上变浅的海平面变化.与水城西北向槽盆萎缩期的沉积效应一致.%Baomoshan formation of the Early Permian widely distributes in Shuicheng area;its lithology is a layer of carbonate rock with an intercalated thin clastic rocks.The composition of the carbonate rocks greatly changes in horizontal direction.In this study,9 strip plane sections and more than 300 pieces of rock thin sections were measured and analyzed,from which 6 microfacies were summarized.These microfacies include abundant foraminiferal grainstone/ bioclastic lime-argillaceous limestone (SMF18),bioclastic lime-argillaceous limestone with skeletal fragment/grain lime-argillaceous limestone (SMF10),oncolite
rudstone/grained limestone (SMF13),sea lily enriched limestone (SMF12-CRIN),the shells of skeletal fragment (SMF11) and biological boundstone (SMF7).Through the comparison of different sections of rock structure,biological assemblage and hydrodynamic energy feature,the results show that the sedimentary environment of the Baomoshan formation was betweenopen sea platform and sea platform margin,with at least three times of the sea regression events from the northwest to the southeast in Shuicheng area,which coincide with the trough basin shrinking period deposition effect of this area.
【总页数】6页(P313-318)
【作者】龙建喜;陈建书;彭成龙;潘明;龚桂源
【作者单位】贵州省地质调查院,贵阳550081;贵州省地质调查院,贵阳550081;贵州省地质调查院,贵阳550081;中国地质科学院岩溶地质研究所,广西桂林541004;贵州省地质调查院,贵阳550081
【正文语种】中文
【中图分类】P588.2;P531
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