佳—伊断裂带韧性变形特征  

Characteristics of ductile deformation of Jiamusi-Yitong fault

作　　者：孟婧瑶[1,2] 刘永江[1] 梁琛岳[1,3] 温泉波[1] 韩国卿[1] 米晓楠 张丽[5] 

机构地区：[1]吉林大学地球科学学院,长春130061 [2]俄克拉荷马州立大学地质系 [3]萨尔茨堡大学地质地理系 [4]山东莱克工程设计有限公司,山东东营25700 [5]沈阳地质矿产研究所,沈阳110034

出　　处：《世界地质》2013年第4期800-807,共8页World Geology

基　　金：国家油气专项:松辽盆地及外围上古生界油气资源战略选区(2009GYXQ12);吉林省自然科学基金项目(20101560);吉林省科技发展计划资助项目(201101021);青年基金项目(41101240)联合资助

摘　　要：佳木斯—伊通(佳—伊)断裂带是郯—庐断裂带北段的西支,控制着佳—伊地堑内各盆地的展布。笔者在佳—伊断裂带中部舒兰水曲柳地区发现一条近NNE向的韧性剪切带。结合显微构造分析认为,该剪切带主要由初糜棱岩—糜棱岩组成,具有左行走滑的特征。对研究区内韧性剪切带中的糜棱岩进行有限应变测量(Fry法),认为该剪切带应变类型为伸展应变,岩石类型表现为L/LS型构造岩;对糜棱岩样品进行石英C轴EBSD分析,同样指示佳—伊断裂带中段具有左行走滑的构造特征,石英组构以中低温菱面为主,滑移系为{101}<110>。结合前人研究资料,推测佳—伊断裂带中段左行走滑时间为早白垩世中、晚期,形成机制与西太平洋伊泽纳崎板块由NWW转变为NNW向欧亚大陆的高速俯冲有关。The Jiamusi-Yitong falut was the western branch of northern extension of Tan-Lu fault, which con- trolled the distributions of many basins within Jia-Yi graben. The authous found a ductile-brittle shear zone with trend of NNE in Shuiquliu of Shulan area. Combining the microstructure study, the authors consider that the shear zone was consisted of protomylonite-mylonite and displayed sinistral strike-slip shear characteristics. With the meas- urement of finite-strain determination （ Fry measurement）, the strain type of the study area was considered to be ex- tension strain. EBSD （ electron back scatter diffraction） measurement also indicated the study area had undergone a sinistral strike-slip shear zone and quartz fabrics were mainly low-middle temperature prism-glide fabrics with slip system of 100011 〈 110 〉. To sum up, Shuiquliu shear zone had experienced a sinistral strike-slip shearing in middle-late Early Cretaceous, which was related to moving direction changing from NWW to NNW of the western Pacific Izanagi plate obliquely subducting under the Eurasia plate.

关 键 词：佳-伊断裂带 韧性剪切带 有限应变测量 EBSD 左行走滑 

分 类 号：P588.33[天文地球—岩石学] P542.3[天文地球—地质学]