Diverse Late Triassic arc magmatism and porphyry Cu deposits in the southeastern Tibetan Plateau: Related to slab tear along a subducting passive margin?
文献类型：期刊论文
| 作者 | Tang, Wan-Li1,2,3; Chen, Jian-Lin2,3; Yang, Tian-Nan6; Yin, An5; Xu, Ji-Feng4; Ren, Jiang-Bo1,2,3 |
| 刊名 | LITHOS
 |
| 出版日期 | 2024 |
| 卷号 | 464页码:14 |
| 关键词 | Ocean-continent transition (OCT) belt Slab tearing Basalts and arc -like andesites Subduction Mineralized porphyries Southeastern Tibetan Plateau |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2023.107455 |
| 英文摘要 | The subduction of the ocean-continent transition (OCT) zone on a passive margin has received limited attention, despite its significant impact on tectono-magmatic processes. This study focuses on the Late Triassic basalts and andesites in the southeastern Tibetan Plateau, where the Yushu-Yidun Arc belt intersects the Longmen Shan Fault system. The goal is to understand the interplay between these linear systems. The basalts exhibit trace element and isotopic signatures resembling those of within-plate enriched mid-ocean ridge basalts or ocean island basalts (EOBs), such as positive Nb-Ta anomalies, high Nb/Th (7.72 to 10.3) and epsilon Nd(t) (+2.23 to +6.34) values, and low La/Sm values (2.69 to 4.05), suggesting an asthenospheric mantle source. The contemporaneous andesites display typical arc-like geochemical characteristics (e.g., enrichment in Ba, Th, and U but depletion in Nb, Ta, and Ti), with negative epsilon Nd(t) values (-2.41 to -1.08), indicating a mantle wedge source affected by subducted components. Geological evidence indicates that the Longmen Shan Fault zone, previously defined by its magmatic rocks, was an active OCT belt during the Late Triassic, separating the South China Continent from the Garze-Litang Ocean. Consequently, we propose a model suggesting the tearing of a subducted oceanic slab from the continental lithosphere within the OCT belt under the southernmost segment of the Yushu-Yidun Arc belt, driven by strong slab pull in the Garze-Litang Ocean subduction zone. This model effectively explains the intriguing geology of the Songpan-Garze-Hoh Xil Terrane, in which Late Triassic EOBs and normal arc-related igneous rocks coexist and are accompanied by abundant slab-derived mineralized porphyries. Our findings have global implications for investigating geochemically diverse magmatism and associated mineralization on passive continental margins. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:001134212600001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/76003]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Chen, Jian-Lin; Yang, Tian-Nan |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100039, Peoples R China 2.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 3.Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 4.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China 5.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA 6.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tang, Wan-Li,Chen, Jian-Lin,Yang, Tian-Nan,et al. Diverse Late Triassic arc magmatism and porphyry Cu deposits in the southeastern Tibetan Plateau: Related to slab tear along a subducting passive margin?[J]. LITHOS,2024,464:14. |
| APA | Tang, Wan-Li,Chen, Jian-Lin,Yang, Tian-Nan,Yin, An,Xu, Ji-Feng,&Ren, Jiang-Bo.(2024).Diverse Late Triassic arc magmatism and porphyry Cu deposits in the southeastern Tibetan Plateau: Related to slab tear along a subducting passive margin?.LITHOS,464,14. |
| MLA | Tang, Wan-Li,et al."Diverse Late Triassic arc magmatism and porphyry Cu deposits in the southeastern Tibetan Plateau: Related to slab tear along a subducting passive margin?".LITHOS 464(2024):14. |
入库方式： OAI收割
来源：广州地球化学研究所
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