【摘要】 对青藏高原东南缘晚新生代抬升扩展的研究是联系青藏高原周缘陆内变形发展特征的重要问题。通过藏东南察隅地区的磷灰石裂变径迹分析揭示,自北向南的德姆拉岩体、阿扎贡拉岩体和察隅岩体受控于断裂构造而表现出的晚新生代差异抬升—剥露是高原向周缘扩展的一种指示。抬升—剥露的时序为15.1～13.7Ma、6.3～4.3Ma、3.5～3.3Ma、1.9～1.7Ma和1.1～1.0Ma,活动性总体上向南扩展和迁移。晚中新世(约6～5Ma)是岩体抬升—剥露速率出现转折的关键时期,在藏东南—滇西北地区具有区域响应,并可能奠定了现今青藏高原东南缘的地势发展格局。从青藏高原东北部到东南部,高原晚新生代陆内变形向周缘的扩展和增生表现出多阶段、准同时和不均衡的发展特性。更多还原

【Abstract】 Study on Late Cenozoic propagation of uplift in the southeast margin of the Tibetan Plateau is critical to link with development of intra-continental deformation in the periphery of the Tibetan Plateau.The apatite fission track analysis in Chayu area of the southeast Tibetan Plateau reveals that the Late Cenozoic differential uplift-exhumation of Demula,Arza Gongla and Chayu batholiths,which arrayed from north to south and controlled by faults,is a proxy of propagation of uplift.The time series of uplift- exhumation are ca.15.1～13.7Ma,6.3～4.3Ma,3.5～3.3Ma,1.9～1.7Ma and 1.1～1.0Ma and the overall activities show southward propagation and migration.It is in Late Miocene (ca.6～5Ma) that uplift-exhumation rate turns speedup with a regional response in southeast Tibet and northwest Yunnan and may establish the development pattern of modern terrain for the southeast margin of the Tibetan Plateau.From the southeast to northeast of the Tibetan Plateau,the outward propagation and growth of late Cenozoic deformation is characterized by multistage,coeval and disequilibrium developments.更多还原