Tracking multiple stages of serpentinization processes of the Yarlung Zangbo Suture Zone peridotites in southern Tibet: Implications for the tectonic evolution of the Neotethyan oceanic lithosphere
文献类型：期刊论文
| 作者 | Zhao, Qi3,4,5; Yan, Yi2,3,4,5; Dilek, Yildirim6; Peng, Touping4,5 ; Zhu, Yuxiang1; Zhu, Zuofei7,8
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| 刊名 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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| 出版日期 | 2024-05-01 |
| 卷号 | 136期号:5-6页码:2509-2525 |
| ISSN号 | 0016-7606 |
| DOI | 10.1130/B36875.1 |
| 英文摘要 | Serpentinites are key repositories of fluidmobile elements (FMEs) in subduction zones and record significant information about the origin and geodynamic evolution of oceanic lithosphere. Here, we report on the structural textures and mineralogical compositions of different types of serpentinites collected from the central segment of the Yarlung Zangbo Suture Zone in southern Tibet and present their bulk -rock and mineral chemistry, and Sr isotopic compositions. The main textures include massive, scaly, and gouge serpentinites exposed in the Ngamring and Sangsang ophiolites. Bulk -rock Al 2 O 3 /SiO 2 and spinel Cr# values suggest that the Ngamring serpentinites originally formed in an abyssal setting, whereas the Sangsang serpentinites developed initially in a forearc mantle. Both serpentinite assemblages were subsequently incorporated into a subduction plate interface as subducted serpentinites. Massive serpentinites preserve the geochemical fingerprint of original serpentinized fluids in mid -oceanic ridge to forearc settings, whereas sheared serpentinites with scaly and gouge textures are reset in their Sr isotopic compositions and FME ratios (i.e., Cs/U, Li/U, and Rb/U) due to their reactions with slab -derived fluids. Scaly and gouge types of the Ngamring serpentinites have lower 87 Sr/ 86 Sr values ( 87 Sr/ 86 Sr = 0.7081-0.7082) and higher alkali element-U ratios (i.e., Cs/U, Li/U, and Rb/U) than those of the massive serpentinite types ( 87 Sr/ 86 Sr = 0.7091-0.7096), which indicates that they interacted with fluids at a slab interface after their initial seafloor serpentinization. In contrast, the massive Sangsang serpentinites display lower 87 Sr/ 86 Sr values ( 87 Sr/ 86 Sr = 0.7041-0.7043, similar to those of the Yarlung Zangbo ophiolites) and higher alkali element-U ratios than those of the sheared serpentinites ( 87 Sr/ 86 Sr = 0.7063- 0.7087). These findings point to the significant role of the increased influx of subducted sediment -derived fluids within subduction shear zones in further affecting the serpentinization fingerprint. This study demonstrates that serpentinites with different textural, geochemical, and isotopic features within the same suture zone may represent the serpentinization products in different tectonic environments during the seafloor spreading, subduction initiation, and subduction zone evolution of oceanic lithosphere. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001236341000002 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78546]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Yan, Yi |
| 作者单位 | 1.China Univ Geosci, Sch Earth Sci, Wuhan 430074, Peoples R China 2.Southern Marine Sci & Engn Guangdong Lab, Guangzhou 511458, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510640, Peoples R China 4.Chinese Acad Sci, Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 6.Miami Univ, Dept Geol & Environm Earth Sci, Oxford, OH 45056 USA 7.China Geol Survey, Acad South China Sea Geol Sci, Sanya 572025, Peoples R China 8.Guangzhou Marine Geol Survey, Sanya Inst South China Sea Geol, Sanya 572025, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, Qi,Yan, Yi,Dilek, Yildirim,et al. Tracking multiple stages of serpentinization processes of the Yarlung Zangbo Suture Zone peridotites in southern Tibet: Implications for the tectonic evolution of the Neotethyan oceanic lithosphere[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2024,136(5-6):2509-2525. |
| APA | Zhao, Qi,Yan, Yi,Dilek, Yildirim,Peng, Touping,Zhu, Yuxiang,&Zhu, Zuofei.(2024).Tracking multiple stages of serpentinization processes of the Yarlung Zangbo Suture Zone peridotites in southern Tibet: Implications for the tectonic evolution of the Neotethyan oceanic lithosphere.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,136(5-6),2509-2525. |
| MLA | Zhao, Qi,et al."Tracking multiple stages of serpentinization processes of the Yarlung Zangbo Suture Zone peridotites in southern Tibet: Implications for the tectonic evolution of the Neotethyan oceanic lithosphere".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 136.5-6(2024):2509-2525. |
入库方式： OAI收割
来源：广州地球化学研究所
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