Evolution of Late Paleozoic Magmatic Arc in the Yili Block, NW China: Implications for Oroclinal Bending in the Western Central Asian Orogenic Belt
文献类型：期刊论文
| 作者 | Wang, Xiangsong1,6; Cai, Keda4,5,6; Sun, Min1; Zhao, Guochun1; Xiao, Wenjiao3,6; Xia, Xiaoping2 |
| 刊名 | TECTONICS
 |
| 出版日期 | 2020-12-01 |
| 卷号 | 39期号:12页码:24 |
| 关键词 | Yili Block Central Asian Orogenic Belt accretionary orogenesis tectonic switch oroclinal bending |
| ISSN号 | 0278-7407 |
| DOI | 10.1029/2019TC005822 |
| 英文摘要 | Subduction transformation (advancing vs. retreating) may be manifested by compositional variations of arc magmas and may result in oroclinal bending. Identifying relevant chemical and physical processes is crucial for understanding accretionary orogenesis and continental crustal evolution. The Northern Yili Block (NYB) was situated on an active margin associated with subduction of the Junggar Ocean (part of the Paleo-Asian Ocean) and underwent perplexing accretionary orogenesis in late Paleozoic. Two episodes of subduction-related granitoid magmatism have been identified, the first in the Late Devonian (374-369 Ma) and the second in the Late Carboniferous (ca. 304 Ma). These two episodes of granitoid magmatism exhibit contrasting features; for example, the first episode shows low epsilon(Nd)(t) (-6 to -2) and epsilon(Hf)(t) (-12 to +3) values, while the second episode displays relatively higher values (-2 to +7 and 0 to +20, respectively), suggesting increase contribution of juvenile components in the magma sources. The calculated zircon saturation temperatures are mostly 800 degrees C for the second episode. The (La/Yb)(N) ratios of the two-episode granitoids vary from 2-17 to 1-9, indicative of the NYB crustal thinning in the Late Carboniferous. In addition, the migrations of the magmatic arc and trench in the NYB took place coevally in the Late Carboniferous and were accompanied by development of an accretionary complex and an immature back-arc basin. We interpret that the arc magmatic variations and migrations reflect geodynamic transition from the Late Devonian advancing subduction to the Late Carboniferous retreating subduction. The retreating subduction of the Junggar oceanic plate possibly resulted in prominent oroclinal bending of the southern Kazakhstan collage system in the Late Carboniferous. |
| WOS关键词 | ZIRCON U-PB ; QUANTIFYING CRUSTAL THICKNESS ; TECTONIC EVOLUTION ; CONTINENTAL GROWTH ; TIANSHAN OROGEN ; VOLCANIC-ROCKS ; SOUTH CHINA ; TIEN-SHAN ; ACCRETIONARY OROGENS ; KAZAKSTAN OROCLINE |
| 资助项目 | National Science Foundation of China[41872082] ; National Science Foundation of China[41622205] ; Hong Kong Research Grant Council[17302317] ; Hong Kong Research Grant Council[17303415] ; Fundamental Research Funds for the Central Universities[2652018116] ; Fundamental Research Funds for the Central Universities[2652018135] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000603666700003 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 资助机构 | National Science Foundation of China ; National Science Foundation of China ; Hong Kong Research Grant Council ; Hong Kong Research Grant Council ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National Science Foundation of China ; National Science Foundation of China ; Hong Kong Research Grant Council ; Hong Kong Research Grant Council ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National Science Foundation of China ; National Science Foundation of China ; Hong Kong Research Grant Council ; Hong Kong Research Grant Council ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National Science Foundation of China ; National Science Foundation of China ; Hong Kong Research Grant Council ; Hong Kong Research Grant Council ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/99972]  |
| 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 | Cai, Keda |
| 作者单位 | 1.Univ Hong Kong, Dept Earth Sci, Hong Kong, Peoples R China 2.Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou Inst Geochem, Guangzhou, Peoples R China 3.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing, Peoples R China 4.China Univ Geosci, Sch Earth Sci & Resources, Beijing, Peoples R China 5.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing, Peoples R China 6.Chinese Acad Sci, State Key Lab Desert & Oasis Ecol, Xinjiang Inst Ecol & Geog, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Xiangsong,Cai, Keda,Sun, Min,et al. Evolution of Late Paleozoic Magmatic Arc in the Yili Block, NW China: Implications for Oroclinal Bending in the Western Central Asian Orogenic Belt[J]. TECTONICS,2020,39(12):24. |
| APA | Wang, Xiangsong,Cai, Keda,Sun, Min,Zhao, Guochun,Xiao, Wenjiao,&Xia, Xiaoping.(2020).Evolution of Late Paleozoic Magmatic Arc in the Yili Block, NW China: Implications for Oroclinal Bending in the Western Central Asian Orogenic Belt.TECTONICS,39(12),24. |
| MLA | Wang, Xiangsong,et al."Evolution of Late Paleozoic Magmatic Arc in the Yili Block, NW China: Implications for Oroclinal Bending in the Western Central Asian Orogenic Belt".TECTONICS 39.12(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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