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山西黎城中元古界长城系常州沟组 岩石学特征和沉积环境

作    者:王玺童1,2, 王怀厂3, 官玉龙1,2, 刘文香3, 罗顺社1,4, 吕奇奇1,2, 张 严1
单    位:1 长江大学地球科学学院; 2 油气资源与探测国家重点实验室; 3 中国石油长庆油田勘探开发研究院; 4 非常规油气湖北省协同创新中心
基金项目:本文受国家科技重大专项所属子课题“华北中新元古界沉积特征及生储盖组合研究”资助
摘    要:
根据野外露头剖面观察与实测、镜下薄片观察、粒度分析、X-衍射分析等资料,对山西黎城中元古界长城系常州沟组岩石学特征与沉积环境进行了系统的分析。研究认为:①黎城常州沟组以石英砂岩和长石石英砂岩为主,夹少量泥页岩或砂质泥岩,其成分成熟度与结构成熟度均较高,为碎屑岩潮坪沉积。②常州沟组按岩性及其组合特征可分为3段:常一段岩性主要为细粒石英砂岩,为潮下带沉积;常二段岩性主要为石英砂岩、长石石英砂岩,为潮上带—潮间沙坪沉积;常三段岩性主要为细粒石英砂岩,夹少量长石石英砂岩,为潮下带—潮间混合坪沉积。③常州沟组整体水动力表现为强—弱—强—弱的变化过程。建立了障壁型海岸相碎屑岩潮坪沉积模式。
关键词:岩石学特征; 沉积相; 常州沟组; 长城系; 黎城; 山西

Petrological characteristics and sedimentary environment of Changzhougou Formation of the Mesoproterozoic Changcheng System in Licheng, Shanxi

Author's Name: WANG Xitong, WANG Huaichang, GUAN Yulong, LIU Wenxiang, LUO Shunshe, LÜ Qiqi, ZHANG Yan
Institution: 
Abstract:
Based on the field outcrop observation and measurement, thin section observation under microscope, grain size analysis and X-ray diffraction analysis, the petrological characteristics and sedimentary environment of Changzhougou Formation of the Mesoproterozoic Changcheng System in Licheng, Shanxi are systematically analyzed. The results show that: (1) The Changzhougou Formation in Licheng is mainly composed of quartz sandstone and feldspar quartz sandstone, with a small amount of shale or sandy mudstone. Its compositional maturity and structural maturity are high, and it is the deposition of clastic tidal flat. (2) Changzhougou Formation can be divided into three members according to lithology and combination characteristics: the first member is mainly composed of fine-grained quartz sandstone, which is deposited in subtidal zone; the second member is mainly composed of quartz sandstone and feldspathic quartz sandstone, which is deposited in supratidal zone-intertidal sand flat; the third member is mainly composed of fine-grained quartz sandstone with a small amount of feldspathic quartz sandstone, which is deposited in subtidal zone-intertidal mixed flat. (3) The overall hydrodynamic performance of Changzhougou Formation is a change process of strong-weak-strong-weak. A tidal flat sedimentary model of clastic rocks of barrier coastal facies is established.
Keywords: petrological characteristics; sedimentary facies; Changzhougou Formation; Changcheng System; Licheng; Shanxi
投稿时间:2021-03-31  
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