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鄂尔多斯盆地中侏罗世直罗--安定期沉积构造特征
赵俊峰 刘池洋 喻林 梁积伟 黄雷
摘 要:中侏罗世直罗--安定期伴随大华北盆地分化瓦解,直罗--安定组除在鄂尔多斯盆地呈整体分布外,在其周邻地区亦有大量零星分布的同期可对比地层.在现今盆地内,直罗组主要为河流相沉积;安定组以干旱气候条件下的河流、湖泊相沉积为主.直罗--安定组的湖相沉积主要位于盆地东南部的古沉积中心部位,其堆积中心位于盆地西部的乌海--鄂托克前旗--平凉一线,堆积中心与沉积中心偏离.直罗组沉积前古构造格局为南高北低、东高西低.直罗--安定期的古地质面貌呈西北高东南低特点,南、北分异表现甚微.结合周邻同期地层岩性、岩相和现今构造单元形成时限等综合分析,认为直罗--安定期原始盆地的边界大致为:西在贺兰山之西,东达吕梁山之东、太行山以西,北抵大青山,南至秦岭.
关键词:沉积相;古地质构造;直罗--安定期;鄂尔多斯盆地
分类号:TE111.1 文献标识码:A
文章编号:0253-9985(2006)02-0159-08
Sedimentary tectonic features of Ordos basin in Middle Jurassic Zhiluo-Anding stages
Zhao Junfeng Liu Chiyang Yu Lin Liang Jiwei Huang Lei
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基金项目:国家重点基础研究发展规划(973)项目(2003CB214607);长江学者和创新团队发展计划资助项目(IRT0559)
作者简介:赵俊峰(1975-),男,工程师(博士生),石油地质
作者单位:赵俊峰(西北大学,陕西,西安,710069)
刘池洋(西北大学,陕西,西安,710069)
喻林(西北大学,陕西,西安,710069)
梁积伟(西北大学,陕西,西安,710069)
黄雷(西北大学,陕西,西安,710069)
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