Revision of the Chinese Altai-East Junggar Terrane Accretion Model Based on Geophysical and Geological Constraints
文献类型：期刊论文
| 作者 | Guy, Alexandra2; Schulmann, Karel1,2; Soejono, Igor2; Xiao, Wenjiao3,4,5 |
| 刊名 | TECTONICS
 |
| 出版日期 | 2020-04-01 |
| 卷号 | 39期号:4页码:24 |
| 关键词 | Potential field data Chinese Altai East Junggar Erqis Crustal structure Accretionary wedge |
| ISSN号 | 0278-7407 |
| DOI | 10.1029/2019TC006026 |
| 英文摘要 | Potential field data analysis, geology, and geochemistry are used to revise the terrane accretion model of the Chinese Altai and East Junggar. Major gradients of potential field data demarcate significant crustal structures and their continuity in depth. These data demonstrate that the distribution of geophysical anomalies does not match with terranes boundaries defined previously. Instead, heterogeneously developed NE/SW-trending gravity and NW-SE magnetic anomalies in both units correlate with Devonian and Permian tectonometamorphic zones, respectively. Geophysical data also indicate a dense lower crust of the East Junggar confirmed by previous igneous petrology studies and seismic experiment. The northern tip of this dense crust coincides with the main gravity gradient beneath the Chinese Altai and a prominent magnetic high located above a NW/SE-trending zone of Permian granulites. This zone forms a boundary between north- and south-dipping gravity and magnetic anomalies that are interpreted as reflecting quasi-symmetrical extrusion of the Chinese Altai crust. In contrast, all geophysical data show the absence of a prominent deep-seated discontinuity which can be correlated with the Erqis Zone. These data are compared with corresponding data sets from southern Mongolia allowing the proposition of a new geodynamic model for the studied area. This model involves (1) accretionary stage characterized by Late Devonian joint evolution of the East Junggar and Chinese Altai characterized by N-S trending orogenic fabrics and (2) Early Permian oroclinal bending associated with underthrusting of the dense Junggar basement beneath the Chinese Altai and the development of NW-SE trending deformation zones in both units. Key Points The Chinese Altai and East Junggar are revised using the potential field, geological, and geochemical data Geophysical domains result from the Devonian and Permian tectonometamorphic and magmatic reworking No prominent deep-seated discontinuity defines the Erqis Zone challenging its tectonic importance |
| WOS关键词 | ASIAN OROGENIC BELT ; NW CHINA ; GEOCHRONOLOGICAL CONSTRAINTS ; MONGOLIA IMPLICATIONS ; PALEOZOIC EVOLUTION ; TECTONIC EVOLUTION ; CRUSTAL STRUCTURE ; VOLCANIC-ROCKS ; ARC SYSTEMS ; LAKE ZONE |
| 资助项目 | Grant Agency of the Czech Republic (GACR )[GX19-27682X] ; internal grant of the Czech Geological Survey[310140] ; National Key R&D Program of China[2017YFC0601206] ; National Natural Science Foundation of China[41888101] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000546683100013 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 资助机构 | Grant Agency of the Czech Republic (GACR ) ; Grant Agency of the Czech Republic (GACR ) ; internal grant of the Czech Geological Survey ; internal grant of the Czech Geological Survey ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Grant Agency of the Czech Republic (GACR ) ; Grant Agency of the Czech Republic (GACR ) ; internal grant of the Czech Geological Survey ; internal grant of the Czech Geological Survey ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Grant Agency of the Czech Republic (GACR ) ; Grant Agency of the Czech Republic (GACR ) ; internal grant of the Czech Geological Survey ; internal grant of the Czech Geological Survey ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Grant Agency of the Czech Republic (GACR ) ; Grant Agency of the Czech Republic (GACR ) ; internal grant of the Czech Geological Survey ; internal grant of the Czech Geological Survey ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/97127]  |
| 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 | Guy, Alexandra |
| 作者单位 | 1.Univ Strasbourg, CNRS, UMR 7516, IPGS, Strasbourg, France 2.Czech Geol Survey, Ctr Lithospher Res, Prague, Czech Republic 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China 5.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Urumqi, Peoples R China |
| 推荐引用方式 GB/T 7714 | Guy, Alexandra,Schulmann, Karel,Soejono, Igor,et al. Revision of the Chinese Altai-East Junggar Terrane Accretion Model Based on Geophysical and Geological Constraints[J]. TECTONICS,2020,39(4):24. |
| APA | Guy, Alexandra,Schulmann, Karel,Soejono, Igor,&Xiao, Wenjiao.(2020).Revision of the Chinese Altai-East Junggar Terrane Accretion Model Based on Geophysical and Geological Constraints.TECTONICS,39(4),24. |
| MLA | Guy, Alexandra,et al."Revision of the Chinese Altai-East Junggar Terrane Accretion Model Based on Geophysical and Geological Constraints".TECTONICS 39.4(2020):24. |
入库方式： OAI收割
来源：地质与地球物理研究所
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