Microstructures documenting Cenozoic extension processes in the northern continental margin of the South China Sea
文献类型：期刊论文
| 作者 | Sun, Liheng; Sun, Zhen; Huang, Xiaolong; Jiang, Yingde; Sntock, Joann Miriam |
| 刊名 | INTERNATIONAL GEOLOGY REVIEW
 |
| 关键词 | Greenschist-facies mylonite petrography microstructure Continental margin of the northern South China Sea Cenozoic IODP367/368 |
| DOI | 10.1080/00206814.2019.1669079 |
| 英文摘要 | In order to investigate the thinning process of the northern continental margin of the South China Sea, petrographic and microstructural analysis were carried out on 20 greenschistfacies mylonite samples, which were obtained from Site U1504 of IODP Expedition 367/368 in the Outer Margin High of the region. The mineral assemblage of the greenschist-facies mylonite is chlorite + epidotite + albite (Ab = 94.7-99.9) + quartz, which contains 10-30% gravel components. Microstructural analysis indicates that the greenschist-facies mylonite experienced two episodes of deformation:early ductile deformation followed by a later stage of brittle deformatio. Both episodes of deformation suggest an extensional environment. The extensive development of bulging recrystallization (BLG) of quartz, microscopic fractures and fine granulation of albite suggest that the temperature of ductile deformation is about 300-400 degrees C, compatiable with a ductile shearing at shallow crust levels (5-10 km). Petrographic features suggest that the greenschist-facies mylonite might originate from volcanic sedimentary rocks or sedimentary rocks affected by the intrusion of mafic magma. Combined with seismic interpretation, we propose that the greenschist-facies mylonite might be formed by crustal exhumation after thick Mesozoic sediments were denuded by a major extension. |
| 资助机构 | Natural Science Foundation of Guangdong ProvinceNational Natural Science Foundation of Guangdong Province [2017A030312002]; K.C. Wong Education Foundation [GJTD-2018-13]; IODP-China [91628301]; CAS P.I.F.I. visiting professor project [2019VMA0002]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41576070, 41625007]; US National Science FoundationNational Science Foundation (NSF); IODP-South China Sea Deep Project [91628301] ; Natural Science Foundation of Guangdong ProvinceNational Natural Science Foundation of Guangdong Province [2017A030312002]; K.C. Wong Education Foundation [GJTD-2018-13]; IODP-China [91628301]; CAS P.I.F.I. visiting professor project [2019VMA0002]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41576070, 41625007]; US National Science FoundationNational Science Foundation (NSF); IODP-South China Sea Deep Project [91628301] |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18268]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 推荐引用方式 GB/T 7714 | Sun, Liheng,Sun, Zhen,Huang, Xiaolong,et al. Microstructures documenting Cenozoic extension processes in the northern continental margin of the South China Sea[J]. INTERNATIONAL GEOLOGY REVIEW. |
| APA | Sun, Liheng,Sun, Zhen,Huang, Xiaolong,Jiang, Yingde,&Sntock, Joann Miriam. |
| MLA | Sun, Liheng,et al."Microstructures documenting Cenozoic extension processes in the northern continental margin of the South China Sea".INTERNATIONAL GEOLOGY REVIEW |
入库方式： OAI收割
来源：南海海洋研究所
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