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藏南吉隆盆地位于喜马拉雅造山带内部,是藏南拆离系(STDS)和南北向裂谷交汇地区.该区自南而北可划分为5个构造-岩石单元:(1)高喜马拉雅岩系;(2)STDS大型剪切带;(3)特提斯喜马拉雅岩系;(4)晚新生带盆地,如吉隆、沃马盆地等;(5)马拉山穹隆构造期次可以划分为4期:(a)特提斯喜马拉雅和高喜马拉雅中均有残留的早期向南的逆冲构造;(b)STDS自南向北的伸展滑脱,与该运动相关的正断层形成新生代盆地的早期控制构造,盆地间断块掀斜方式指示北向滑脱运动;(c)东西向伸展作用形成南北向正断层,控制盆地东部边界;(d)晚期垮塌作用.来自STDS同构造花岗岩SHRIMPU-Pb年龄显示STDS主期活动时代约为26Ma,而其启动年龄可能早于36Ma.
Located in the interior of the Himalaya orogen, the South Tibet Geor- ic Basin is the junction of the South Tibet Detachment System (STDS) and the North-South Rift. This area is divided into five tectonic-lithospheric units from south to north: (1) ; (2) STDS large shear zone; (3) Tethyan Himalayan series; (4) Late Cenozoic belt basins, such as Geelong and Wolma Basin; (5) The Malashan dome can be divided into 4 (A) Residual early southward thrust structures are found in both the Tethyan Himalayas and the High Himalayas; (b) SSTDS extends from south to north and the normal faulting associated with this movement forms the early Cenozoic basin (C) east-west extension forming a normal north-south fault that controls the eastern boundary of the basin; (d) late collapse. SHRIMPU-Pb ages from STDS syn- thetic granites show that the STDS The main activity period is about 26Ma, and its start-up age may be earlier than 36Ma.