| Paleozoic post-collisional magmatism and high-temperature granulite-facies metamorphism coupling with lithospheric delamination of the East Kunlun Orogenic Belt, NW China | |
Wang, Qian1,2 ; Zhao, Jiao3; Zhang, Chuanlin4; Yu, Shengyao5; Ye, Xiantao4; Liu, Xiaoqiang4
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| 2022 | |
| 发表期刊 | GEOSCIENCE FRONTIERS
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| ISSN | 1674-9871 |
| 卷号 | 13期号:1页码:18 |
| 通讯作者 | Zhao, Jiao([email protected]) |
| 摘要 | Lithosphere extension and upwelling of asthenosphere at post-collisional stage of an orogenic cycle generally induce diverse magmatism and/or associated high-temperature metamorphism. Nevertheless, the intimate coexistence of post-collisional magmatic activity and high-temperature metamorphism is rare. In this contribution, a lithological assemblage composing of diverse magmatic rocks deriving from distinct magma sources and coeval high-temperature metamorphism was identified in eastern Kunlun. Petrography, ages, mineral chemistry and whole-rock geochemistry demonstrated that those intimately coexistent diverse rocks were genetically related to post-collisional extension. The garnet-bearing mafic granulites in Jinshuikou area interior of the East Kunlun Orogenic Belt are mainly composed of garnet, orthopyroxene, and plagioclase, with peak metamorphic P-T conditions of similar to 701-756 degrees C and 5.6-7.0 kbar, representing a granulite-facies metamorphism at 409.7 +/- 1.7 Ma. The diverse contemporaneous magmatic rocks including hornblendites, gabbros and granites yield zircon U-Pb ages of 408.6 +/- 2.5 Ma, 413.4 +/- 4.6 Ma, and 387-407 Ma, respectively. The hornblendites show N-MORB-like REE patterns with (La/Sm)(N) values of 0.85-0.94. They have positive zircon epsilon(Hf)(t) values of 0.1-4.9 and whole-rock epsilon(Nd)(t) values of 3.9-4.7 but relatively high (Sr-87/Sr-86), values of 0.7081 to 0.7088. These features demonstrate that the hornblendites derived from a depleted asthenospheric mantle source with minor continental crustal materials in source. As for the gabbros, they exhibit arc-like elemental signatures, low zircon epsilon(Hf)(t) values (-4.3 to 2.5) and variable whole-rock epsilon(Nd)(t) values (-4.9 to 1.2) as well as high (Sr-87/Sr-86)(i) values (0.7068 to 0.7126), arguing for that they were originated from partial melting of heterogeneous lithospheric mantle anteriorly metasomatized by subducted-sediment released melts. Geochemistry of the granites defines their strongly peraluminous S-type signatures. Zircons from the granites yield a large range of epsilon(Hf)(t) values ranging from -30.8 to -5.1, while the whole-rock samples yield consistent (Sr-87/Sr-86)(i) values (0.7301 to 0.7342) and negative epsilon(Nd)(t) values (-10.1 to -12.4). These features indicate that the S-type granites could be generated by reworking of an ancient crust. Taken together, the penecontemporaneous magmatism and metamorphic event, demonstrated the early-middle Devonian transition from crustal thickening to extensional collapse. The post-collisional mantle-derived magmas serve as an essential driving force for the high-temperature granulite-facies metamorphism and anataxis of the crust associated with formation of S-type granite. This study not only constructs a more detail Proto-Tethys evolution process of the eastern Kunlun, but also sheds new light on better understanding the intimate relationship between magmatism and metamorphism during post-collisional extensional collapse. (C) 2021 China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. |
| 关键词 | East Kunlun orogenic belt Post-collisional extensional collapse Magmatism High-temperature metamorphism Crust-mantle interaction |
| DOI | 10.1016/j.gsf.2021.101271 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | Fundamental Research Funds for the Central Universities[2019B00414]; Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Acad-emy of Sciences[MGE2020KG03]; PHD early develop-ment program of East China University of Technology[DHBK2018035] |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:000731455900002 |
| 出版者 | CHINA UNIV GEOSCIENCES, BEIJING |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/177549 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Zhao, Jiao |
| 作者单位 | 1.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Qingdao 266590, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 3.East China Univ Technol, State Key Lab Nucl Resources & Environm, Nanchang 330013, Jiangxi, Peoples R China 4.Hohai Univ, Coll Oceanog, Nanjing 210098, Peoples R China 5.Ocean Univ China, Coll Marine Geosci, Inst Adv Ocean Study, Key Lab Submarine Geosci & Prospecting Tech, Qingdao 266100, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Wang, Qian,Zhao, Jiao,Zhang, Chuanlin,et al. Paleozoic post-collisional magmatism and high-temperature granulite-facies metamorphism coupling with lithospheric delamination of the East Kunlun Orogenic Belt, NW China[J]. GEOSCIENCE FRONTIERS,2022,13(1):18. |
| APA | Wang, Qian,Zhao, Jiao,Zhang, Chuanlin,Yu, Shengyao,Ye, Xiantao,&Liu, Xiaoqiang.(2022).Paleozoic post-collisional magmatism and high-temperature granulite-facies metamorphism coupling with lithospheric delamination of the East Kunlun Orogenic Belt, NW China.GEOSCIENCE FRONTIERS,13(1),18. |
| MLA | Wang, Qian,et al."Paleozoic post-collisional magmatism and high-temperature granulite-facies metamorphism coupling with lithospheric delamination of the East Kunlun Orogenic Belt, NW China".GEOSCIENCE FRONTIERS 13.1(2022):18. |
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