郯庐断裂带早白垩世火山岩的K-Ar年龄及其构造意义  

K-Ar DATING OF EARLY CRETACEOUS VOLCANIC ROCKS ALONG THE TAN-LU FAULT ZONE AND ITS TECTONIC SIGNIFICANCE

作　　者：牛漫兰[1] 谢成龙[1] 宋传中[1] 王道轩[1] 向必伟[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,合肥230009

出　　处：《地质科学》2007年第2期382-387,共6页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金项目(批准号:40272094);安徽省高等学校青年教师科研资助计划项目(2005jq1020)

摘　　要：安徽肥东龙山和山东沂水道托火山岩的K—Ar全岩年龄分别为119．2±2．3M。和114.8±1.0Ma，明显晚于郯庐断裂带左行平移时间（143．3±1．3Ma），与断裂带内张八岭隆起北段侵入岩中黑云母的^40Ar -^39 Ar坪年龄（120～128Ma），以及南段肥东一巢湖地区的花岗岩中锆石定年结果（106．9～121．4Ma）一致，可能是断裂带伸展活动的产物。The volcanic rocks from Longshan, Feidong in Anhui and Daotuo, Yishui in Shandong, along the Tan-Lu fauh zone, were dated. The whole rock K-Ar ages of them was 119.2 ±2.3 Ma and 114.8 ± 1.0 Ma respectively, which were obviously latter than the time of left-lateral slipping（ 143.3 ± 1.3 Ma） and coincident with the biotite ^40Ar- ^39 Ar ages （ 120 - 128 Ma） from the intrusive rocks in Zhangbaling and zircons ages （ 106.9 - 121.4 Ma ） from the granites in Feidong-Chaohu area. These ages implied that the Tan-Lu fault zone became, from a largescale left-lateral slipping in early Early Cretaceous, an extensional one in late Early Cretaceous, and acted as a pathway of magmatic activities, which was related to regional lithospheric thinning in eastern North China Block.

关 键 词：K—Ar年龄 火山岩 伸展 郯庐断裂带 

分 类 号：P597[天文地球—地球化学]