Knowledge Management System Of Guangzhou Institute of Geochemistry，CAS
Hu, Wan-Long1,2; Wang, Qiang1,2,3,6 ; Yang, Jin-Hui4; Hao, Lu-Lu1,2; Wang, Jun1,2; Qi, Yue1,2; Yang, Zong-Yong1,5; Sun, Peng1
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| Growth of the continental crust induced by slab rollback in subduction zones: Evidence from Middle Jurassic arc andesites in central Tibet | |
| Source Publication | GONDWANA RESEARCH
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| ISSN | 1342-937X |
| 2023-05-01 | |
| Volume | 117Pages:8-22 |
| DOI | 10.1016/j.gr.2023.01.001 |
| Language | 英语 |
| WOS Research Area | Geology |
| Abstract | 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. |
| Keyword | Middle Jurassic Melange diapir melting Crustal growth Slab rollback Central Tibet |
| WOS ID | WOS:000925285100001 |
| Indexed By | SCI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.gig.ac.cn/handle/344008/72680 |
| Collection | 同位素地球化学国家重点实验室 |
| Corresponding Author | Wang, Qiang |
| Affiliation | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 2.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 5.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China 6.Chinese Acad Sci, Guangzhou Inst Geochem GIG, State Key Lab Isotope Geochem SKLaBIG, Wushan St, Guangzhou 510640, Peoples R China |
| Recommended Citation 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. |
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