兹格塘错幅地质调查新成果及主要进展

New results and major progress in regional geological survey of the Zigê Tangco Sheet

在地层、岩浆岩、构造研究等方面取得重要进展。①晚侏罗世尕苍见火山弧和齐日埃加查蛇绿混杂岩的发现,揭示出班公湖-怒江洋盆在中晚侏罗世存在向北俯冲的迹象;②在晚白垩世、古近纪陆相火山岩和燕山期构造岩浆活动序次等研究方面,取得了一批同位素年代测定结果,对羌南中新生代构造演化过程及高原隆升的反演具有重要意义;③东巧一带变质橄榄岩的流变学研究,证实其在洋盆消减、仰冲过程中经历了复杂的变形机制;④发现具有经济价值的新的锑铜矿化层位。

Important progress has been made in the study of stratigraphy, magmatic rocks and structure. ① The discovery of the Late Jurassic Gacangjian volcanic arc and Qiriaijiacha ophiolitic mélange reveals that there was the sign of northward subduction of the Bangong Co-Nujiang oceanic basin in the Mid-Late Jurassic; ② A number of isotope age data have been obtained in the study of Late Cretaceous and Paleogene continental volcanic rocks and sequences of Yanshanian tectonomagmatic activities, which has great significance for the deduction of the Meso-Cenozoic tectonic evolutionary process in southern Qiangtang and plateau uplift; ③ The rheological study of metaperidotite in the vicinity of Dongqiao verified that the rock underwent a complex deformation mechanism during the subduction and obduction of the oceanic basin; and ④ A new antimony-copper mineralization horizon of economic value has been found.