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The Geological Significance of the Deformation and Geochronology of the Xiaotian-Mozitan Shear Zone in the Dabie Orogenic Belt (East-Central China)

文献类型：期刊论文

作者Huang Peng3,4,8; Song Chuanzhong5; Xiao Wenjiao2,3,6,7; Li Jiahao5; Zhou Kefa3,4,8; Wang Jinlin3,4,8; Nijiati Abuduxun1,3,8; Li Zhenwei5
刊名ACTA GEOLOGICA SINICA-ENGLISH EDITION
出版日期2021-04-01
卷号95期号:2页码:370-392
关键词syndeformation temperature zircon U-Pb dating tectonic regime transition Xiaotian-Mozitan Shear Zone Dabie Orogenic Belt
ISSN号1000-9515
DOI10.1111/1755-6724.14652
英文摘要The Xiaotian-Mozitan Shear Zone (XMSZ) is the boundary of the Dabie High-grade Metamorphic Complex (DHMC) and the North Huaiyang Tectonic Belt. It was deformed in ductile conditions with a top-to-NW/WNW movement. Geothermometers applied to mineral parageneses in mylonites of the shear zone give a temperature range of 623-691 degrees C for the predeformation and 515-568 degrees C for the syndeformation, respectively, which indicates a retrograde process of evolution. A few groups of zircon U-Pb ages were obtained from undeformed granitic veins and different types of deformed rocks in the zone. Zircons from the felsic ultramylonites are all magmatic, producing a weighted mean Pb-206/U-238 age of 754 +/- 8.1 Ma, which indicates the time of magmatic activities caused by rifting in the Neoproterozoic. Zircons from the granitic veins, cutting into the mylonites, are also of magmatic origin, producing a weighted mean Pb-206/U-238 age of 130 +/- 2.5 Ma, which represents the time of regional magmatic activity in the Cretaceous. Zircons from the mylonitic gneisses are of anatectic-metamorphic origins and are characterized by a core-mantle interior texture, which yielded several populations of ages including the Neoproterozoic ages with a weighted mean Pb-206/U-238 age of 762 +/- 18 Ma, similar to that of the felsic ultramylonites and the Early Cretaceous ages with a weighted mean Pb-206/U-238 age of 143 +/- 1.8 Ma, indicating the anatectic metamorphism in the Dabie Orogenic Belt (DOB). Based on integrated analysis of the structure, thermal conditions of ductile deformation and the contact relations of the dated rocks, the activation time of the Xiaotian-Mozitan Shear Zone is constrained between similar to 143 Ma and 130 Ma, during which the DOB was undergoing a transition in tectonic regime from compression to extension. Therefore, the deformation and evolution of this shear zone plays an instrumental role in fully understanding this process. This research also inclines us to the interpretation of it as an extensional detachment, with regard to the tectonic properties of the shear zone. It may also be part of a continental scale extension in the background of the North China Block's cratonic destruction, dominated by the subduction and roll-back of the Paleo-Pacific plate, but more detailed work is needed in order to unravel its complicated development.
WOS关键词ZIRCON U-PB ; METAMORPHIC CORE COMPLEX ; ULTRAHIGH-PRESSURE METAMORPHISM ; MESOZOIC EXTENSIONAL TECTONICS ; NORTH CHINA ; TRACE-ELEMENT ; SUPRADETACHMENT BASINS ; CRETACEOUS GRANITOIDS ; ISOTOPIC COMPOSITIONS ; EXHUMATION MECHANISM
资助项目High Level Talent Introduction Program of Xinjiang Uyghur Autonomous Region ; National Postdoctoral Program[2018M643776] ; Key R&D Program of China[2017YFC0601206]
WOS研究方向Geology
语种英语
WOS记录号WOS:000653317300006
出版者WILEY
资助机构High Level Talent Introduction Program of Xinjiang Uyghur Autonomous Region ; High Level Talent Introduction Program of Xinjiang Uyghur Autonomous Region ; National Postdoctoral Program ; National Postdoctoral Program ; Key R&D Program of China ; Key R&D Program of China ; High Level Talent Introduction Program of Xinjiang Uyghur Autonomous Region ; High Level Talent Introduction Program of Xinjiang Uyghur Autonomous Region ; National Postdoctoral Program ; National Postdoctoral Program ; Key R&D Program of China ; Key R&D Program of China ; High Level Talent Introduction Program of Xinjiang Uyghur Autonomous Region ; High Level Talent Introduction Program of Xinjiang Uyghur Autonomous Region ; National Postdoctoral Program ; National Postdoctoral Program ; Key R&D Program of China ; Key R&D Program of China ; High Level Talent Introduction Program of Xinjiang Uyghur Autonomous Region ; High Level Talent Introduction Program of Xinjiang Uyghur Autonomous Region ; National Postdoctoral Program ; National Postdoctoral Program ; Key R&D Program of China ; Key R&D Program of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/102015]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Huang Peng
作者单位1.Xinjiang Univ, Sch Geol & Min Engn, Xinjiang Key Lab Geodynam Proc & Metallogen Progn, Urumqi 830046, Peoples R China
2.Chinese Acad Sci, Chinese Acad Sci Ctr Excellence Tibetan Plateau E, Beijing 100101, Peoples R China
3.Chinese Acad Sci, Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Peoples R China
4.Xinjiang Key Lab Mineral Resources & Digital Geol, Urumqi 830011, Peoples R China
5.Hefei Univ Technol, Sch Resources & Environm Engn, Hefei 230009, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100049, Peoples R China
7.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
8.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Peoples R China
推荐引用方式
GB/T 7714		 Huang Peng,Song Chuanzhong,Xiao Wenjiao,et al. The Geological Significance of the Deformation and Geochronology of the Xiaotian-Mozitan Shear Zone in the Dabie Orogenic Belt (East-Central China)[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2021,95(2):370-392.
APA Huang Peng.,Song Chuanzhong.,Xiao Wenjiao.,Li Jiahao.,Zhou Kefa.,...&Li Zhenwei.(2021).The Geological Significance of the Deformation and Geochronology of the Xiaotian-Mozitan Shear Zone in the Dabie Orogenic Belt (East-Central China).ACTA GEOLOGICA SINICA-ENGLISH EDITION,95(2),370-392.
MLA Huang Peng,et al."The Geological Significance of the Deformation and Geochronology of the Xiaotian-Mozitan Shear Zone in the Dabie Orogenic Belt (East-Central China)".ACTA GEOLOGICA SINICA-ENGLISH EDITION 95.2(2021):370-392.

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来源：地质与地球物理研究所

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