摘要
an id="EnChDivSummary" name="EnDivSummary">Many scholars are focusing on Paleogene Lulehe Formation of the Qaidam Basin as its sedimentary evolution is closely related to the uplift of Tibet Plateau and it has seen well evidences of oil and gas in recent years. The provenance analysis as an important method of understanding the orogenic belt evolution,the basin sedimentation and dividing the oil-gas favorable zone has become the key elements of researching Lulehe Formation. Former study about the tertiary sediment provenance analysis of Qaidam Basin were from different regions and strata of the basin but not included the Lulehe Formation from the whole basin scale. This study has a system analysis of the Paleogene Lulehe Formation in Qaidam Basin,which combined by the heavy mineral assemblage, distributional characteristics of the ZTR index and the stability factor in plane and the types of lithic fragment. We initially divide Lulehe Formation into 11 sediment provenance systems containing Kunteyi-Lenghu No.1～4,Mahai-Nanbaxian,Hongshan,Eboliang- Jianshan,Youshashan-Yuejin,Huangshi-Wanxi,etc. And we basically determine the source direction and the types of the parent rocks. The results show that characteristics of sediments are obvious differences in different source areas,indicating the sediments from the Kunlun Mountain has the longest transport distance,Altun Mountain has the shortest transport distance and Qilian Mountain has the medium transport distance. The understanding mentioned above provides the foundation for the fine division of provenance system in the study area,the restoration of prototype basin as well as basin tectonic evolution.an>
