摘要
依据岩石矿物格架组分特征及岩石化学的环境指示意义,对鄂尔多斯盆地东部地区物源性质及山西组构造背景进行研究。结果表明:长石含量呈现由本溪组向石千峰组逐渐增多的趋势,是沉积环境由滨浅海—湖—内陆盆地过渡造成的;本溪组—石盒子组物源区性质为再旋回造山带,而石千峰组物源区性质过渡为陆块和再旋回造山带。常量元素、微量元素分析均一致表明山西组物源区总体成分主要与被动大陆边缘环境和活动陆缘相关。在盆地北部存在一由于板块间发生碰撞和俯冲作用形成的再旋回造山带,作为山西组沉积的主要供给区域。
According to the composition framework based on rock and mineral deposition process and its differentforms,and environmental significance of rocks,the Shanxi provenance and tectonic setting in the eastern OrdosBasin were studied.The results show that the content of feldspar increased from the Benxi to Shiqianfeng formation,because of deposition environment transition from shallow shore to lake to inland basin.The nature of source areasof Benxi-Shihezi formation mainly distributed in the recycled orogen,but the nature of source areas of Shiqianfengformation changed to continental block and recycled orogen.Analysis of major elements and trace elements showsthat the major source areas relate with passive continental margin and the active continental margin.In the northernbasin,there is a recycled orogen which results from plate collision and subduction as the main supply of Shanxiformation.No.5 Abstract V
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第5期49-53,191-192,共5页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家科技重大专项(2008ZX05005-004)
