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大别山东端郯庐断裂带由走滑向伸展运动转换的40Ar-39Ar年代学记录
引用本文:王勇生,朱光,宋传中,刘国生,向必伟,李长城,谢成龙.大别山东端郯庐断裂带由走滑向伸展运动转换的40Ar-39Ar年代学记录[J].地质科学,2006,41(2):242-255.
作者姓名:王勇生  朱光  宋传中  刘国生  向必伟  李长城  谢成龙
作者单位:合肥工业大学资源与环境工程学院 合肥 230009
摘    要:通过对大别山东端郯庐左旋韧性剪切带中一系列含白云母、黑云母、斜长石和钾长石的糜棱岩样品40Ar-39Ar同位素年代学研究,发现大别山东端的郯庐断裂带在距今139Ma之前发生过一次左行平移运动,随后转变为伸展活动,由走滑向伸展活动转换的时间介于距今139Ma至128Ma之间。在伸展活动中,大别山东端的郯庐走滑韧性剪切带发生了缓慢的抬升和冷却,从而导致封闭温度较低的矿物记录了较小的年龄。黑云母110Ma±以及斜长石97~92Ma的40Ar-39Ar年龄值指示郯庐断裂带的伸展活动一直持续到距今90Ma±。

关 键 词:40Ar-39Ar年龄  走滑向伸展的转换  郯庐断裂带  大别山东端  早白垩世
文章编号:0563-5020(2006)02-0242-14
收稿时间:2005-04-17
修稿时间:2005-05-31

40Ar-39Ar GEOCHRONOLOGY RECORDS OF TRANSITION FROM STRIKE-SLIP TO EXTENSION IN THE TAN-LU FAULT ZONE ON EASTERN TERMINAL OF THE DABIE MOUNTAINS
Wang Yongsheng,Zhu Guang,Song Chuanzhong,Liu Guosheng,Xiang Biwei,Li Changcheng,Xie Chenglong.40Ar-39Ar GEOCHRONOLOGY RECORDS OF TRANSITION FROM STRIKE-SLIP TO EXTENSION IN THE TAN-LU FAULT ZONE ON EASTERN TERMINAL OF THE DABIE MOUNTAINS[J].Chinese Journal of Geology,2006,41(2):242-255.
Authors:Wang Yongsheng  Zhu Guang  Song Chuanzhong  Liu Guosheng  Xiang Biwei  Li Changcheng  Xie Chenglong
Institution:College of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009
Abstract:So far there is a dispute on active modes and time of the Tan-Lu fault zone. This paper used 40Ar-39Ar geochronology to study the samples of muscovite, biotite, plagioclase or K-feldspar from the mylonites along the sinistral Tan-Lu ductile shear zone on eastern terminal of the Dabie Mountains. It was discovered that the Tan-Lu fault zone acted as a sinistral strike-slip one before 139 Ma, then became an extensional one. Our work revealed that the transition time might be 128~139 Ma ago. In the course of extension, the Tan-Lu ductile shear zone experienced slowly rift and cooling, which caused the minerals with less closure temperature recorded small ages. The 40Ar-39Ar ages of 110 Ma of the biotite and 97~92 Ma of the plagioclase indicated that the extension activity of the Tan-Lu fault zone continued to about 90 Ma.
Keywords:40Ar-39Ar ages  Transition from strike-slip to extension  The Tan-Lu fault zone  Eastern terminal of the Dabie Mountains  Early Cretaceous
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