Tectonic evolution of the South Pamir Orogen: Insights from the Permian to cretaceous magmatism
文献类型：期刊论文
| 作者 | Ashuraliev, Sohibnazar5,6; Xiao, Wenjiao5,6; Mao, Qigui6; Yang, He6; Miao, Sang6; Yogibekov, Dzhovid6; Aminov, Jovid4; Moghadam, Hadi Shafaii6; Mamadjanov, Yunus2,3; Odinaev, Sharifjon1 |
| 刊名 | LITHOS
 |
| 出版日期 | 2024-09-01 |
| 卷号 | 480-481页码:18 |
| 关键词 | I-type granite A-type granite Slab roll-back Pamir Neo-Tethys |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2024.107648 |
| 英文摘要 | The Pamir orogen originated through the amalgamation of various arc terranes. Despite undergoing numerous studies, the subduction polarity and time regarding the accretion processes remain inadequately constrained. To address these issues, we carried out a detailed study of zircon and apatite U -Pb ages, zircon Hf isotopes, and whole-rock geochemistry for the Permian to Cretaceous gabbro, volcanic rocks and granitoids from the Southern Pamir and the Rushan-Pshart suture. Three stages of magmatism are identified, including 279-266 Ma gabbro and andesite to dacite, 209-208 Ma granitoids, and 108-103 Ma gabbro and granitoids, respectively. The Permian gabbro and basaltic andesite to dacite in Pshart Range are enriched in light rare earth elements (LREE) and large ion lithophile elements (LILE), but are depleted in Ta, Nb, and Ti, suggesting formation from an enriched mantle source in a subduction zone. The Late Triassic I-type granitoids are typical arc calc-alkaline magmatic rocks with epsilon Hf(t) values varying from -8.7 to -3.5, which mainly sourced from the partial melting of mixed crustal sources predominately consisting mafic rocks with minor metasedimentary rocks. The Early Cretaceous Pshart granites are I-type granites with relatively low epsilon Hf(t) values ranging from -14.6 to -2.9, suggesting that they were crust-derived rocks. The Early Cretaceous Bazardara granites are identified as A2-type granites with the epsilon Hf(t) values ranging from -18.3 to +5.3, and were derived from mixing of mantle-derived and crust-derived magmas, or interaction between mantle melts and old crustal rocks. The early Cretaceous gabbro exhibits -MORB-like geochemical characteristics with flat REE pattern (La/YbN = 4.96), moderate enrichment of LILEs and weak depletion of Nb, Ta and Ti (Nb/LaPM = 0.94). Thus, the early Cretaceous A2-type granite, EMORB-like gabbro and volcanic rocks were formed in an extensional setting. Our new data indicate that the southward subduction of the Rushan-Pshart oceanic slab started in the Early Permian and continued to the Late Triassic. Moreover, combining the previous data, we conclude that the Early Cretaceous granites and gabbro in the Southern Pamir formed in an extensional environment due to the southward rollback after northward nearflat subduction of the Neo-Tethyan oceanic lithosphere. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:001247571300002 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78420]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Xiao, Wenjiao; Mao, Qigui |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China 2.Res Ctr Ecol & Environm Cent Asia Dushanbe, Dushanbe 734063, Tajikistan 3.Natl Acad Sci Tajikistan, Inst Geol Earthquake Engn & Seismol, Dushanbe 734063, Tajikistan 4.Univ Cent Asia, Dept Earth & Environm Sci, Khorog 736000, Tajikistan 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 6.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ashuraliev, Sohibnazar,Xiao, Wenjiao,Mao, Qigui,et al. Tectonic evolution of the South Pamir Orogen: Insights from the Permian to cretaceous magmatism[J]. LITHOS,2024,480-481:18. |
| APA | Ashuraliev, Sohibnazar.,Xiao, Wenjiao.,Mao, Qigui.,Yang, He.,Miao, Sang.,...&Odinaev, Sharifjon.(2024).Tectonic evolution of the South Pamir Orogen: Insights from the Permian to cretaceous magmatism.LITHOS,480-481,18. |
| MLA | Ashuraliev, Sohibnazar,et al."Tectonic evolution of the South Pamir Orogen: Insights from the Permian to cretaceous magmatism".LITHOS 480-481(2024):18. |
入库方式： OAI收割
来源：广州地球化学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。