塔里木盆地与南天山的耦合关系:来自(U-Th)/He年龄的新证据

The coupling relationship between the South Tianshan Mountains and the Tarim Basin: New evidence from the(U-Th)/He ages

塔里木盆地与南天山构造-沉积耦合关系是目前国内地质研究的热点之一。文中首次利用盆地内钻井样品的磷灰石和锆石(U-Th)/He年龄探讨了塔里木盆地与南天山构造-沉积耦合关系。塔北隆起He年龄为15～3Ma的磷灰石和锆石来自于南天山,热史模拟结果揭示了南天山在晚中新世开始快速抬升的时间约为15Ma,一直持续到5Ma左右。在此基础上,建立了南天山与塔里木盆地北缘新近纪的构造-沉积耦合关系演化模式。晚中新世,南天山开始快速隆升遭受剥蚀,而塔里木盆地北缘剧烈沉降接受来自南天山的沉积物。盆地内的磷灰石和锆石He年龄有效地记录了这些地质信息,为盆-山耦合关系研究提供了新证据。

The tectono-depositional coupling relationship between the Tarim Basin and the South Tianshan Mountains has become one of the hotspots for geological research in China.This paper applies the（U-Th）/He ages of apatite and zircon from the drilling samples in the basin to study the coupling relationship between the Tarim Basin and the South Tianshan Mountains.The apatite and zircon of the Tabei Uplift,whose He ages fall into the range of 15 Ma to 3 Ma,are from the South Tianshan Mountains.The thermal modeling results reveal that the South Tianshan Mountains uplifted rapidly from ~15 Ma to ~5 Ma in Late Miocene.Based on the results,the evolution model is proposed to show the tectonics-sedimentation coupling relationship between the North Tarim Basin and the South Tianshan Mountains.During Late Miocene,the South Tianshan Mountains began to uplift rapidly with serious erosion while the North Tarim Basin was dramatically subsided accepting the sediments from the South Tianshan Mountains.The He ages of apatite and zircon effectively record the geological information and provide new evidence for the study of the basin-mountain coupling relationship.