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郯庐断裂带肥东段剪切活动锆石U-Pb测年
引用本文:王微,宋传中,李加好,任升莲,张妍,刘欢,杨帆.郯庐断裂带肥东段剪切活动锆石U-Pb测年[J].地质科学,2015,0(3):800-809.
作者姓名:王微  宋传中  李加好  任升莲  张妍  刘欢  杨帆
作者单位:合肥工业大学资源与环境工程学院 合肥 230009
摘    要:郯庐断裂带肥东段出露的桃源韧性剪切带内发育有长英质超糜棱岩、长英质伟晶岩脉体等。这两种构造岩与剪切带呈现不同的穿切关系, 分别代表着剪切活动不同时期的产物, 它们可以为郯庐断裂带的剪切年限提供重要的年代学制约。本次研究从长英质超糜棱岩的U-Pb锆石测年得出了133.3±4.1 Ma的变质锆石年龄。结合笔者先前得出的伟晶岩脉129±3.3 Ma年龄判断, 郯庐断裂带在133 Ma左右有一次剪切活动, 该次剪切活动在129 Ma左右仍有着较弱的持续, 指示肥东地区在137~126 Ma的时间段内, 有一次挤压活动叠加。此外, 长英质超糜棱岩样品中捕获的1.9 Ga和2.4 Ga的锆石, 很可能来自华南板块基底。

关 键 词:郯庐断裂带  肥东  锆石U-Pb定年  剪切年限
收稿时间:2014-12-10
修稿时间:2014-12-10;

Zircon U-Pb dating for shearing movement on the Feidong segment of the Tan-Lu fault zone
Wang Wei,Song Chuanzhong,Li Jiahao,Ren Shenglian,Zhang Yan,Liu Huan,Yang Fan.Zircon U-Pb dating for shearing movement on the Feidong segment of the Tan-Lu fault zone[J].Chinese Journal of Geology,2015,0(3):800-809.
Authors:Wang Wei  Song Chuanzhong  Li Jiahao  Ren Shenglian  Zhang Yan  Liu Huan  Yang Fan
Institution:School of Resources and Environment Engineering, Hefei University of Technology, Hefei 230009
Abstract:Felsic mylonite and pegmatite veins generally growed in Feidong Taoyuan ductile shear zone in Tan-Lu fault zone. They show different relationships with the ductile shear zone, and represent products of different periods of the ductile shearing, so they can help in the shearing timing analysis. Through zircon U-Pb dating, we got metamorphic age 133.3±4.1 Ma from the ultra-mylonite sample. Combined with the pegmatite vein age 129±3.3 Ma the writer got before, we hold that during 137~126 Ma, the Tan-Lu fault zone once sheared, and it still last when the pegmatite vein formed. This is a breakthrough for Tan-Lu fault zone. Besides, we got 1.9 Ga and 2.4 Ga basement ages from the felsic ultra-mylonite sample, which may possiblely be complementary to the Paleoproterozoic age of the South China base plate.
Keywords:Tan-Lu fault belt  Feidong  Zircon U-Pb dating  Shearing years
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