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| 陕西小秦岭华阳川韧性剪切带的特征及其区域构造意义 | |
| 引用本文： | 郭威,;周鼎武,;任军锋,;周小虎,;桑海清. 陕西小秦岭华阳川韧性剪切带的特征及其区域构造意义[J]. 中国区域地质, 2008, 0(6): 823-828 |
| 作者姓名： | 郭威, 周鼎武, 任军锋, 周小虎, 桑海清 |
| 作者单位： | [1]西北大学地质系,陕西西安710069; [2]长安大学地球科学与资源学院,陕西西安710054; [3]山东科技大学,山东青岛266510; [4]中国石油天然气股份有限公司长庆油田分公司,陕西西安710021; [5]中国科学院地质与地球物理研究所,北京100029 |
| 基金项目： | 国家精品课程《鄂尔多斯盆地-秦岭造山带野外地质教学》项目资助. |
| 摘 要： | 陕西小秦岭华阳川韧性剪切带发育在新太古界太华群之中，野外调研和显微构造观察结果表明，该韧性剪切带是由构造片岩、眼球状片麻岩组成的深层次韧性剪切带，具有逆冲兼左行走滑的斜冲特征。对韧性剪切带构造片岩黑云母进行^40Ar／^39Ar同位素定年，获得坪年龄为419M±0．6Ma，反等时线年龄为417Ma±0．8Ma。认为华阳川韧性剪切带及其相应的小秦岭区域主导构造变形是发生于419Ma左右的秦岭加里东事件的结果。 |
| 关 键 词： | 秦岭造山带 韧性剪切带 ^40Ar/^39Ar同位素定年 陕西小秦岭华阳川 |
Characteristics of the Huayangchuan ductile shear zones in the Xiaoqinling Mountains,Shaanxi, China,and its regional tectonic significance. |
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| Affiliation: | GUO Wei, ZHOU Ding-wu, REN Jun-feng, ZHOU Xiao-hu, SANG Hai-qing(1. Department of Geology, Northwest University, Xi＇an 710069, Shaanxi,China; 2. School of Earth Sciences and Resources Management, Chang＇an University, X i＇an 710054, Shaanxi , China ; 5. Shandong University of Science and Technology, Qingdao 266510, Shandong, China; 4. Changqing Petroleum Company, CNPC, Xi＇an 710021, Shaanxi , China ; 5. Institute of Geology and Geophysics ,Chinese Academy of Sciences ,Beijing 100029,China) |
| Abstract: | The Huayangchuan ductile shear zone in the Xiaoqinling Mountains, Shaanxi, formed in the Neoarchean Taihua Group complex. Field survey and microscopic observation have revealed this ductile shear zone is a deep-level zone, consisting of tectonic schist and augen gneiss, which have features of thrust and sinistral strike-slip oblique subduction. ^40Ar/^39Ar dating of biotite from tectonic schist in the ductile shear zone yielded a plateau age of 419±0.6 Ma and an inverse isochron age of 417±0.8 Ma. Therefore the authors think that the Huayangchuan ductile shear zone and its related regional principal tectonic deformation of the Xiaoqinling Mountains formed in the Caledonian event at 419±Ma. |
| Keywords: | Qinling orogenic belt ductile shear zone ^40Ar/^39Ar dating Xiaoqinling Mountains, Shaanxi |
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