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Late Cretaceous adakitic and A-type granitoids in Chanang, southern Tibet: Implications for Neo-Tethyan slab rollback

Wang, Zhenzhen and Zhao, Zhidan and Li, Xuping and Asimow, Paul D. and Liu, Dong and Mo, Xuanxue and Qi, Ningyuan and Tang, Yan and Wang, Qing and Zhu, Di-Cheng and Zhang, Liangliang and Sheikh, Lawangin (2021) Late Cretaceous adakitic and A-type granitoids in Chanang, southern Tibet: Implications for Neo-Tethyan slab rollback. Gondwana Research, 96 . pp. 89-104. ISSN 1342-937X. doi:10.1016/j.gr.2021.04.007. https://resolver.caltech.edu/CaltechAUTHORS:20210514-140222611

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Abstract

The co-existence of Cretaceous adakitic and A-type granitoids in southern Tibet can offer fundamental constraints on subduction of the Neo-Tethyan oceanic plate and associated crustal growth processes, if their petrogenetic relationships are understood. Here, we report whole-rock geochemistry, zircon U-Pb geochronology, in situ zircon Hf isotopes and zircon trace elements from the Chanang intrusive suite, including the Zeyu and Cuojielin plutons. The Cuojielin pluton is composed of A-type quartz syenites with high K₂O + Na₂O, FeO^T, and Zr contents and distinct negative Eu anomalies, consistent with fractional crystallization of mafic magma in a reducing, low-pressure, high-temperature environment. The adakitic Zeyu pluton, by contrast, has a strikingly high density of mafic enclaves. The elemental and isotopic signatures of the Zeyu mafic enclaves indicate a hybrid origin by mixing of magmas derived from the mantle wedge and from juvenile lower crust. The adakitic Zeyu host rocks, with low MgO, Cr, and Ni contents, show typical characteristics which originate from residual or fractionated amphibole of juvenile lower crust. The co-existence of aluminous A₂-type granites and adakitic rocks indicates an anomalous high-temperature and relatively H₂O-rich environment. The synchronous regional occurrence of calc-alkaline magmatism, charnockites, granulite-facies metamorphism, back-arc extension, and generation of the two studied types of Chanang intrusive rocks can best be explained in the context of an episode of rollback of the Neo-Tethyan slab in the late Cretaceous.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.gr.2021.04.007DOIArticle
ORCID:
AuthorORCID
Asimow, Paul D.0000-0001-6025-8925
Additional Information:© 2021 International Association for Gondwana Research. Published by Elsevier B.V. Received 16 January 2021, Revised 9 April 2021, Accepted 14 April 2021, Available online 12 May 2021. We thank the editor for handling this manuscript and two anonymous reviewers for constructive comments. We are grateful to Youqing Wei, Mingchun Dong, Han Yan, Jiayi Liu and Jinbao Yang for assistance of fieldwork in Tibet and geochemical analyses. This research was supported by the Second Tibetan Plateau Scientific Expedition and Research (STEP) program (grant 2019QZKK0702), the National Key Research and Development Project of China (project 2016YFC0600304), the Natural Science Foundation of China (grant 41802058), the Fundamental Research Funds for the Central Universities (grants 2652018122 and QZ05201902), and the 111 Project of the Ministry of Science and Technology of China (projects BP0719021 and B18048). ZW acknowledges a fellowship from the China Scholarship Council (CSC No. 201806400019). CRediT authorship contribution statement: Zhenzhen Wang: Writing - original draft, Conceptualization, Methodology. Zhidan Zhao: Writing - review & editing, Supervision. Xuping Li: Supervision. Paul D. Asimow: Writing - review & editing, Supervision. Dong Liu: Supervision. Xuanxue Mo: Resources. Ningyuan Qi: Data curation. Yan Tang: Data curation. Qing Wang: Methodology. Di-Cheng Zhu: Methodology. Liangliang Zhang: Methodology. Lawangin Sheikh: Data curation. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Funders:
Funding AgencyGrant Number
Second Tibetan Plateau Scientific Expedition and Research (STEP)2019QZKK0702
National Key Research and Development Project of China2016YFC0600304
Natural Science Foundation of China41802058
Fundamental Research Funds for the Central Universities2652018122
Fundamental Research Funds for the Central UniversitiesQZ05201902
Ministry of Science and Technology (China)BP0719021
Ministry of Science and Technology (China)B18048
China Scholarship Council201806400019
Subject Keywords:Adakitic rocks; A-type rocks; Slab rollback; Southern Tibet
DOI:10.1016/j.gr.2021.04.007
Record Number:CaltechAUTHORS:20210514-140222611
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210514-140222611
Official Citation:Zhenzhen Wang, Zhidan Zhao, Xuping Li, Paul D. Asimow, Dong Liu, Xuanxue Mo, Ningyuan Qi, Yan Tang, Qing Wang, Di-Cheng Zhu, Liangliang Zhang, Lawangin Sheikh, Late Cretaceous adakitic and A-type granitoids in Chanang, southern Tibet: Implications for Neo-Tethyan slab rollback, Gondwana Research, Volume 96, 2021, Pages 89-104, ISSN 1342-937X, https://doi.org/10.1016/j.gr.2021.04.007.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109139
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:14 May 2021 21:37
Last Modified:26 May 2021 16:57

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