鄂尔多斯盆地宜川地区延长组物源分析  

Ananlysis of sedimentary source of the Yanchang Formation in Yichuan area of Ordos Basin

作　　者：曹红霞[1] 李文厚[1] 何卫军[1] 陈全红[1] 肖丽[1] 冯娟萍[1] 

机构地区：[1]西北大学大陆动力学教育部重点实验室西北大学地质系,陕西西安710069

出　　处：《煤田地质与勘探》2007年第6期14-17,共4页Coal Geology & Exploration

基　　金：国家重点基础研究发展计划(973计划)项目(2003CB214602)

摘　　要：研究区延长组物源方向的确定对沉积相研究及能源勘探开发具有重要意义。依据大量分析化验数据,根据砂岩岩石学特征、轻重矿物组合特征、古水流方向、碎屑粒度变化及稀土元素分配模式等,对研究区延长组物源进行综合研究。结果表明,宜川地区延长组有东北部和南部两个物源方向,且以东北部物源为主,南部物源只对局部有影响;该区延长组母岩主要来自盆地东北缘的太古代及早元古代变质岩。It is very important for confirmation of the sedimentary source direction of Yanchang Formation to research the sedimentary facies of Yanchang Formation and direct the energy sources exploration. In order to confirm the sedimentary source direction of Yanchang Formation in Yichuan area of Ordos Basin, according as abundant analysis and test data, using characteristic of the sandstone lithology, the features of light and heavy mineral group, paleocurrent direction, and rare earth element distributing pattern, analyzed the sedimentary source of Yanchang Formation in Yichuan area. The study results show that the sedimentary source of Yanchang Formation in Yichuan area comes from north-east and south, the sedimentary source from north-east is the main, and that from south affect 1ittle. The mother rock derived form Arehaean and Early Proterozoic metamorphic rock from the north-east part of Ordos Basin.

关 键 词：宜川地区 延长组 重矿物组合 古水流 稀土元素 物源 

分 类 号：P512.2[天文地球—地质学] P534.51