塔西南盆地海退时间及其形成机制研究

A review on regressive time in southwest Tarim Basin and its forming mechanism

位于塔里木盆地以西的新特提斯洋的退出过程对认识中亚盆山耦合过程、海陆分布变化引起的干旱化甚至亚洲气候环境的形成演化具有重要意义,一直是亚洲新生代构造与气候研究的重点科学问题。通过在广泛收集新特提斯洋东段的塔西南盆地的相关低温热年代学、地球物理学、沉积学和古地磁年代学等国内外文献的基础上,介绍了西昆仑山、帕米尔高原、塔里木盆地和新特提斯洋的地质背景,分析了塔里木与帕米尔-西昆仑的盆山耦合关系,确定了塔西南盆地最后的海退时间是在晚始新世,分析了海退出现的主要成因,认为构造因素是造成塔西南盆地早-中始新世海退的主要原因。

The withdrawal the sea water from the Neo-Tethys in the west part of Tarim Basin brought about significant impacts to the Central Asia on basin-mountain coupling,sea-land distribution and associated aridification,and even the drastic changes of climate in the whole Asia.Therefore,it has been remained a key issue in the study of Cenozoic tectonics and climate in the region.On the basis of the data collected from the low temperature thermochronology,geophysics,sedimentology,and paleomagnetic chronology studies around the southwest Tarim Basin,this paper devotes to the description of geological background about the West Kunlun orogenic belt,Pamir Plateau,Tarim Basin,and the Neo-tethys,summarized the spatiotemporal relationship between the Tarim Basin and Pamir-West Kunlun,and reviewed the time of regression in the southwest Tarim Basin.After analyzing the mechanism about the sea water retreating from the southwest Tarim Basin,we suggest that the final sea water regression since the early-middle Eocene owes its origin to tectonic processes.