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| Strain, Kinematic Vorticity and Ductile Thinning along the Detachment Zone of the Yunmeng Shan Metamorphic Core Complex, Beijing, China | |
| 作者姓名： | LI Jianbo WANG Tao GUO Lei TONG Ying OUYANG Zhixia and ZENG Tao |
| 作者单位： | 1 Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China Institute of Technology, Nanchang 330013, Jiangxi, China. 2 East China Institute of Technology, Fu Zhou 344000, Jiangxi, China. 3 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China. 4 Geological Survey Institute Guangdong Nonferrousmetals Geological Survey Bureau, Guangzhou 510080, Guangdong, China |
| 基金项目： | This study was supported by National Natural Science Foundation of China (Grant No. 41102129, 90714006 and 41002073), the foundation of Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China Institute of Technology (Grant No. REGT1207), the Deep Exploration Technology and Experimentation Program of China (Grant No. SinoProbe-08-01-03) and projects of China Geological Survey (1212011120135, 1212010611803, 1212011085474, 1212011085473). |
| 摘 要： | The Yunmeng Shan metamorphic core complex (MCC) is composed of the lower plate, the upper plate and the detachment zone. The detachment zone consists of ductile shear zone (mylonite zone), chloritized microbreccias zone and the brittle fault plane. The ductile shear zone contains mylonitic rocks, protomylonites, and mylonites. Finite strain measurements of feldspar porphyroclasts from those rocks using the Rf/φ method show that the strain intensities increase from mylonitic rocks (Es=0.66–0.72) to protomylonites (Es=0.66–0.83), and to mylonites (Es=0.71–1.2). The strain type is close to flatten strain. Kinematic vorticity estimated by Polar Mohr diagrams suggest that foliations and lineation of mylonite (0.47 |
| 关 键 词： | Yunmeng Shan MCC detachment zone Mylonite Strain Kinematic vorticity the ductile thinning |
| 收稿时间： | 2011/4/12 0:00:00 |
| 修稿时间： | 2012/5/15 0:00:00 |
Strain, Kinematic Vorticity and Ductile Thinning along the Detachment Zone of the Yunmeng Shan Metamorphic Core Complex, Beijing, China |
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| Authors: | LI Jianbo WANG Tao GUO Lei TONG Ying OUYANG Zhixia ZENG Tao |
| Affiliation: | 1. Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China Institute of Technology, Nanchang 330013, Jiangxi, China; East China Institute of Technology, Fu Zhou 344000, Jiangxi, China 2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 10003 7, China 3. Geological Survey Institute Guangdong Nonferrousmetals Geological Survey Bureau, Guangzhou 510080,Guangdong, China |
| Abstract: | The Yunmeng Shan metamorphic core complex (MCC) is composed of the lower plate, the upper plate and the detachment zone. The detachment zone consists of ductile shear zone (mylonite zone), chloritized microbreccias zone and the brittle fault plane. The ductile shear zone contains mylonitic rocks, protomylonites, and mylonites. Finite strain measurements of feldspar porphyroclasts from those rocks using the Rf/φ method show that the strain intensities increase from mylonitic rocks (Es=0.66–0.72) to protomylonites (Es=0.66–0.83), and to mylonites (Es=0.71–1.2). The strain type is close to flatten strain. Kinematic vorticity estimated by Polar Mohr diagrams suggest that foliations and lineation of mylonite (0.47<Wk<0.85) record a bulk simple‐dominated general shearing at the initial evolution stage of the Yunmeng Shan MCC's detachment zone; and the extensional crenulation cleavage(ecc) (0.34 |
| Keywords: | Yunmeng Shan MCC detachment zone Mylonite Strain Kinematic vorticity the ductile thinning |
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