地质学报2025，Vol.99Issue(4)：1134-1149,16.DOI:10.19762/j.cnki.dizhixuebao.2023174
青藏高原东缘汶川-茂县断裂韧性变形对龙门山早期隆升的制约
Ductile deformation of Wenchuan-Maoxian fault constrain the early uplift of Longmen Shan belt
摘要
Abstract
Wenchuan-Maoxian fault in the eastern margin of the Tibetan Plateau(Longmen Shan area)is the major fault that has developed deep ductile deformation and played an important role in controlling the early uplift of the Longmen Shan area.By using the field survey,macro/micro structure analysis,and crystal fabric analysis,we have constrained the kinematic and rheological characteristics and deformation conditions of ductile deformation of the Wenchuan-Maoxian fault.The results show that ① ductile shear zone approximately 3 km wide and steeply dipping to the north west exists within the fault;② two phases of deformation are identified within the shear zone:early Top-to-NW normal shearing and late Top-to-E reverse shearing;③ the quartz CPO results show that the reverse ductile deformation is dominated by basal＜a＞slip,accompanied by bulging recrystallization,with an indicated deformation temperature of 300～400℃.The normal ductile deformation is dominated by prism＜a＞slip,accompanied by subgrain rotation recrystallization,with a corresponding temperature of 350～650℃.Combining with published geochronological and thermochronological data,we suggest that the Wenchuan-Maoxian fault underwent top-to-NW normal ductile faulting in the Oligocene and top-to-E reverse ductile deformation in the Miocene,which resulted in the uplift and exhumation of large amounts of deep material in the hinterland region of Longmen Shan area.关键词
龙门山/汶川-茂县断裂/韧性变形/石英组构/EBSDKey words
Longmen Shan area/Wenchuan-Maoxian fault/ductile deformation/quartz fabric/EBSD引用本文复制引用
葛成隆,李海兵,Philippe Hervé LELOUP,张蕾,郑勇,刘栋梁,Clémentine FELLAH,叶小舟,张进江..青藏高原东缘汶川-茂县断裂韧性变形对龙门山早期隆升的制约[J].地质学报,2025,99(4):1134-1149,16.基金项目
本文为国家自然科学基金项目(编号42230312)和中国地质调查项目(编号DD20240041)联合资助的成果. （编号42230312）
