摘要
根据古地理面貌、古水流方向、轻、重矿物组合特征以及稀土元素分配模式,对鄂尔多斯盆地西南部延长组下段沉积物源进行了分析。结果表明:研究区是一个汇集西、西南、南及东北各方向物源而沉积的一个混源区,但以西南方向为主要物源方向,母岩既有来自盆地外围造山带太古、元古界石英岩、中基性、中酸性火山岩、中深变质岩,也有盆地边缘古隆起区古生界碳酸盐岩、泥岩和砂砾岩。
The deposit provenance of the lower Yanchang Formation in southwest area of Ordos Basin was analyzed according to ancient geographical landscape, paleocurrent direction, light and heavy mineral combination characteristics as well as the rare earth element allocation pattern. The results showed that, the study area is a mixed area which collected the west, southwest, south and northeast source deposits, but take the southwest direction as the maia. The source rocks were derived not only from the quartzite, neutral--basic and neutral--acid volcanic rock, and mid--deep metamorphic rock of the Archean Group of the outside orogenic zones of the basin, but also from the carbonate, mudstone and gravel rock of the Paleozoic Group of Ancient uplift of the edge of the basin.
出处
《内蒙古石油化工》
CAS
2009年第5期118-120,共3页
Inner Mongolia Petrochemical Industry
关键词
延长组
物源分析
古流向
轻、重矿物组合
稀土元素
鄂尔多斯盆地
Yanchang Formation
Source Analysis
Paleocurrent Direction
Light and Heavy Mineral Combination
Rare Earth Element
Ordos Basin
