Provenance analysis of the Neogene in Eboliang area, Qaidam Basin
Li Junwu1, Yang Chengjin1, Li Fengjie1, Wu Yongliang2, Dai Tingyong1
1 Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,Sichuan 2 Exploration and Development Research Institute,Qinghai Oilfield Company,PetroChina,Dunhuang 736202,Gansu
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.
