摘要： 物源分析是沉积盆地研究的重要内容之一。在对柴达木盆地鄂博梁地区新近系相关资料调研的基础之上,对研究区碎屑岩的碎屑组分、岩屑类型、重矿物组合、砂地比和阴极发光平面分布特征进行分析,并结合地震资料,确定出研究区新近系物源方向:鄂博梁Ⅰ号构造带物源主要来自于北部的阿尔金山,而位于其西部的东坪构造带与鄂博梁Ⅰ号构造带物源区不同,其具有相对独立的物源区;鄂博梁Ⅱ号构造带属于混源区,同时受到2个方向物源的影响,分别是北部的阿尔金山方向和东北部的小赛什腾山方向,前者穿过鄂博梁Ⅰ号构造带到达该地区,是主要的物源区,后者穿过冷湖一、二、三号构造带到达该地区,为次要物源区;鄂博梁Ⅲ号构造带物源主要来自于东北方向的赛什腾山,其是穿过冷湖六、七号构造带到达该地区的,并未受到来自南八仙方向 “古鱼卡大型古河流三角洲”物源的控制。

关键词: 柴达木盆地, 鄂博梁地区, 物源分析, 新近系

Abstract: Provenance analysis is an important aspect of basin analysis. Based on the analyses of detrital composition,lithic type,heavy mineral assemblage,sandstone thickness ratio,cathodoluminescence and seismic data,the provenance of Eboliang area in Qaidam Basin during the Neogene has been studied and recognized:The provenance of Eboliang No.Ⅰ　structure mainly comes from the Altyn Tagh Mountain in the north. The Dongping structure belt in the west and Eboliang No.Ⅰ　structure have relatively independent provenance. Eboliang No.Ⅱ　structure is in mixed provenance area,which is influenced by two source directions. The main provenance is from the Altyn Tagh Mountain in the north through Eboliang No.Ⅰ　structure. The other is from Xiaosaishiteng Mountain in the northeast of study area through Lenghu No.1,2 and 3 structures. Provenance of Eboliang No.Ⅲ structure mainly comes from Saishiteng Mountain in the northeast to study area through Lenghu No.6 and Lenghu No.7 structures,without the influence by ancient Yuka large fluvial-dominated delta from Nanbaxian direction.

Key words: Qaidam Basin, Eboliang area, provenance analysis, Neogene

中图分类号: 

• P588.21