地质通报Issue(2)：400-418,19.
中国东北完达山地区早白垩世同构造岩浆侵位--对晚中生代左行走滑作用的响应
Syn-tectonic magmatic emplacement in Wanda Mountain, northeast China：A response to the Late Mesozoic sinistral strike slip motion
摘要
Abstract
Raohe granitic plutons in Wandashan, northeast China show evidence of syn-tectonic magmatic emplacement. The dark minerals and K-feldspar phenocrysts are aligned parallel to the NNE-trending magmatic flow lineation. The lenticular dioritic xeno⁃liths are arranged horizontally, characterized by long axis parallel to the magmatic flow lineation with sinistral shearing. Boudin quartz veins are also well developed in the plutons. All of these features indicate that the plutons were affected by sinistral strike-slip shearing in the process of magmatic intrusion and emplacement. Thus, the Raohe granite was formed in a sinistral strike slip environment which underwent syn-tectonic magmatic flow. The Raohe granite was emplaced at 121±1Ma and 119±1Ma, as shown by LA-ICP-MS zircon U-Pb dating. The wall rock gabbro and the syenite veins and diabase dikes that intruded in the Raohe pluton were ana⁃lyzed by zircon U-Pb dating, with the yielded ages being 160±1Ma, 109±2Ma and 124±1Ma, respectively. According to the charac⁃teristics of inherited zircon age data in these samples, the ages of wall rock gabbro are quite concentrated with no relict zircon ages, whereas the granite and the dikes have inherited zircon age data from Archean to Jurassic. These age data combined with the regional geology might indicate that the Wandashan block had completed the subduction collage before 120Ma, and the Wandashan granitic plutons were formed in sinistral strike slip motion of intracontinental deformation as the syn-tectonic emplacement.关键词
同构造岩浆侵位/走滑环境/完达山/花岗质岩体/LA-ICP-MS锆石U-Pb年龄Key words
syn-tectonic magmatic emplacement/sinistral strike slip motion/Wandashan granite/zircon U-Pb dating分类
天文与地球科学引用本文复制引用
周丽云,王瑜,王娜..中国东北完达山地区早白垩世同构造岩浆侵位--对晚中生代左行走滑作用的响应[J].地质通报,2015,(2):400-418,19.基金项目
中国地质调查局项目 （）
