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| 晓天-磨子潭断裂后造山伸展活动的~(40)Ar-~(39)Ar年代学记录 | |
| 引用本文： | 王勇生,向必伟,朱光,陈文,魏鑫.晓天-磨子潭断裂后造山伸展活动的~(40)Ar-~(39)Ar年代学记录[J].地球化学,2009,38(5). |
| 作者姓名： | 王勇生 向必伟 朱光 陈文 魏鑫 |
| 作者单位： | 1. 合肥工业大学,资源与环境工程学院,安徽,合肥,230009 2. 中国地质大学,地球科学学院,湖北,武汉,430074 3. 中国地质科学院,地质研究所,北京,100037 |
| 摘 要： | 晓天-磨子潭断裂是北大别杂岩带的北部边界,其早白垩世构造活动型式可以为北大别带穹隆演化过程提供制约.为了获得晓天-磨子潭断裂的活动时间,本次工作在详细的野外研究基础上,采集了一系列含黑云母、角闪石、白云母糜棱岩样品进行40Ar-39Ar年代学测试.采自佛子岭地区的XM31-2糜棱岩中角闪石获得了141.9 Ma的坪年龄,该样品变形温度接近于角闪石K-Ar体系的封闭温度,表明该年龄结果为最接近于变形年龄的冷却年龄,指示断裂带形成于141.9 Ma之前的晚侏罗世末或早白垩世初.断裂带糜棱岩中所记录的年龄结果表现出明显的东早西晚的规律,这指示北大别带内罗田穹隆的启动时间要晚于岳西穹隆.断裂带内东、西两段运动学上的差异指示其现今的几何学形态是经过后期构造运动改造而形成的.断裂带东段130 Ma的快速冷却事件的存在指示改造断裂带几何学形态的构造事件发生于130 Ma之后. |
| 关 键 词： | 40Ar-39Ar定年 后造山伸展 晓天.磨子潭断裂 北大别杂岩带 |
~(40)Ar-~(39)Ar geochronology records for post-orogenic extension of the Xiaotian-Mozitan fault |
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| WANG Yong-sheng,XIANG Bi-wei,ZHU Guang,CHEN Wen,WEI Xin.~(40)Ar-~(39)Ar geochronology records for post-orogenic extension of the Xiaotian-Mozitan fault[J].Geochimica,2009,38(5). | |
| Authors: | WANG Yong-sheng XIANG Bi-wei ZHU Guang CHEN Wen WEI Xin |
| Institution: | WANG Yong-sheng1*,XIANG Bi-wei2,ZHU Guang1,CHEN Wen3 and WEI Xin1 1.College of Resource and Environmental Engineering,Hefei University of Techn ology,Hefei 230009,China,2.Faculty of Earth Sciences,China University of Geosciences,Wuhan 430074,Ch ina,3.Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037 |
| Abstract: | As the northern boundary of the North Dabie complex unit, the motion of the Xiaotian-Mozitan fault (XMF) in the Early Cretaceous can be used to und erstand evolution of the North Dabie complex unit during doming. To obtain deformation age of the XMF, this paper used 40Ar-39Ar geochronology to study a serie s of mylonites including biotite, hornblende, and muscovite from Xiaotian-Mozit an ductile shear zone based on detailed field survey. Hornblende separate from XM31-2 mylonite gives a plateau age of 141.9 ... |
| Keywords: | 40Ar-39Ar dating post-orogenic extension Xiaotian-Mozitan fault North Dabie |
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