Growth of the continental crust induced by slab rollback in subduction zones: Evidence from Middle Jurassic arc andesites in central Tibet
文献类型:期刊论文
作者 | Hu, Wan-Long2,6; Wang, Qiang1,2,5,6; Yang, Jin-Hui4; Hao, Lu-Lu2,6; Wang, Jun2,6; Qi, Yue2,6; Yang, Zong-Yong2,3; Sun, Peng2 |
刊名 | GONDWANA RESEARCH |
出版日期 | 2023-05-01 |
卷号 | 117页码:8-22 |
ISSN号 | 1342-937X |
关键词 | Middle Jurassic Melange diapir melting Crustal growth Slab rollback Central Tibet |
DOI | 10.1016/j.gr.2023.01.001 |
英文摘要 | Andesitic rocks have similar compositions to average continental crust and have played a central role in improving our understanding of the formation and evolution of the continental crust. Here we present data for andesites from the Jiaqiong area of the Bangong-Nujiang suture zone (BNSZ), Central Tibet. LA-ICP-MS zircon U-Pb ages demonstrate that these andesites were generated during the Middle Jurassic (169-164 Ma). The Jiaqiong andesites have variable Mg-# (molar 100 x Mg/[Mg + Fe] = 35-63) values, and Cr (3.02-175 ppm) and Ni (5.70-47.7 ppm) contents. These andesitic rocks are enriched in light rare earth elements (REEs) ([La/Yb](N) = 5.2-14.6) and yield relatively flat heavy REE patterns ([Gd/Yb](N) = 1.4-2.1) with negative Ta, Nb, and Ti anomalies. They also have moderately high initial Sr-87/Sr-86 (0.7077-0.7092) ratios and variable negative epsilon(Nd)(t) (-11.0 to -3.3) and zircon epsilon(Hf)(t) (-13.7 to + 2.1) values. These geochemical characteristics suggest that the Jiaqiong andesites were most probably produced by partial melting of melange rocks. Combining our data with the regional geology, particularly that of nearby ophiolites and Jurassic andesitic rocks, we conclude that the formation of these andesites was triggered by asthenospheric upwelling and hot corner flow caused by the rollback of the northward-subducting Bangong-Nujiang Tethyan oceanic lithospheric slab during the Middle Jurassic. The melanges provided the material for the formation of andesites, and probably make a substantial contribution to the vertical growth of the continental crust in subduction zones. (c) 2023 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved. |
WOS关键词 | NUJIANG SUTURE ZONE ; U-PB GEOCHRONOLOGY ; HIGH-MG ANDESITES ; TRACE-ELEMENTS ; ISOTOPIC COMPOSITIONS ; GEOCHEMICAL EVIDENCE ; INITIAL SUBDUCTION ; OPHIOLITIC MELANGE ; SOUTHERN QIANGTANG ; RIDGE SUBDUCTION |
资助项目 | National Natural Science Foundation of China[42021002] ; National Natural Science Foundation of China[91855215] ; National Natural Science Foundation of China[42102051] ; Second Tibetan Plateau Scientific Expedition and Research (STEP)[2019QZKK0702] ; China Postdoctoral Science Foundation[2021M693189] |
WOS研究方向 | Geology |
语种 | 英语 |
出版者 | ELSEVIER |
WOS记录号 | WOS:000925285100001 |
资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation |
源URL | [http://ir.iggcas.ac.cn/handle/132A11/106791] |
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 | Wang, Qiang |
作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem GIG, State Key Lab Isotope Geochem SKLaBIG, Wushan St, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 3.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 5.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 6.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China |
推荐引用方式 GB/T 7714 | Hu, Wan-Long,Wang, Qiang,Yang, Jin-Hui,et al. Growth of the continental crust induced by slab rollback in subduction zones: Evidence from Middle Jurassic arc andesites in central Tibet[J]. GONDWANA RESEARCH,2023,117:8-22. |
APA | Hu, Wan-Long.,Wang, Qiang.,Yang, Jin-Hui.,Hao, Lu-Lu.,Wang, Jun.,...&Sun, Peng.(2023).Growth of the continental crust induced by slab rollback in subduction zones: Evidence from Middle Jurassic arc andesites in central Tibet.GONDWANA RESEARCH,117,8-22. |
MLA | Hu, Wan-Long,et al."Growth of the continental crust induced by slab rollback in subduction zones: Evidence from Middle Jurassic arc andesites in central Tibet".GONDWANA RESEARCH 117(2023):8-22. |
入库方式: OAI收割
来源:地质与地球物理研究所
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