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Subduction of Indian continental lithosphere constrained by Eocene-Oligocene magmatism in northern Myanmar
Li, JX (Li, Jin-Xiang)1,2; Fan, WM (Fan, Wei-Ming)1,2,3; Zhang, LY (Zhang, Li-Yun)1,2; Ding, L (Ding, Lin)1,2; Sun, YL (Sun, Ya-Li)1,2; Peng, TP (Peng, Tou-Ping)2,4; Cai, FL (Cai, Fu-Long)1,2; Guan, QY (Guan, Qiu-Yun)3; Sein, K (Sein, Kyaing)5
Source PublicationLITHOS
2019
Volume348Issue:0Pages:105211
DOI10.1016/j.lithos.2019.105211
Abstract

Subduction of the Indian continental lithosphere in the eastern Tibet-Himalaya orogenic belt remains unclear. Newly reported zircon U-Pb ages in this study indicate that the Shangalon intermediate-felsic magmatic rocks in northern Myanmar formed at Eocene-Oligocene (similar to 40-32 Ma). They have calc-alkaline to shoshonitic characteristics, LREE-enriched patterns, enrichments in LILE (e.g., Rb, Cs), and depletions in HFSE (e.g., Nb). Obviously, they show the higher initial Sr and lower Nd-Hf isotopic compositions (Sr-87/Sr-86(i) = 0.7054-0.7082, epsilon Nd(t) =-5.3 to-0.4, and epsilon Hf(t) =-3.4 to 10.8) than Cretaceous arc-related mafic-felsic rocks in the West Burma terrane. A positive correlation between Nd isotopic compositions and SiO2 contents indicates that the Eocene Shangalon diorite and andesite with the lowest epsilon Nd(t) values (-5.3 to -4.0) likely derived from a mantle source contaminated by the subducted Indian continental lithosphere. Coupled with regional coeval OIB-like mafic melts and high temperature metamorphism, the Eocene-Oligocene Shangalon magma might have formed in the Neo-Tethyan oceanic slab break-off setting after the India-Asia collision. In addition, Eocene granodioritic rocks have the adakitic features, which possibly resulted by fractional crystallization of hornblende. The hornblende-dominated crystallization in the Shangalon ore-bearing granodioritic rocks is well consistent with magma evolution of H2O-rich melts, which play an important role in the formation of the Eocene Shangalon porphyry Cu-Au deposit. (C) 2019 Elsevier B.V. All rights reserved.

Subject AreaGeoscience
WOS IDWOS:000500375700022
Language英语
Indexed BySCI
KeywordZircon U-pb Southern Tibet Evidence Porphyry Cu Deposits Tectonic Evolution Dominated Fractionation Isotopic Constraints Cenozoic Volcanism Eurasia Collision Neotethyan Slab Orogenic Belt
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
Cooperation Status国内
ISSN0024-4937
Department大陆碰撞与高原隆升重点实验室
URL查看原文
PublisherELSEVIER
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9053
Collection图书馆
Corresponding AuthorLi, JX (Li, Jin-Xiang)
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China;
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China;
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China;
4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China;
5.Myanmar Geosci Soc, Yangon, Myanmar.
Recommended Citation
GB/T 7714
Li, JX ,Fan, WM ,Zhang, LY ,et al. Subduction of Indian continental lithosphere constrained by Eocene-Oligocene magmatism in northern Myanmar[J]. LITHOS,2019,348(0):105211.
APA Li, JX .,Fan, WM .,Zhang, LY .,Ding, L .,Sun, YL .,...&Sein, K .(2019).Subduction of Indian continental lithosphere constrained by Eocene-Oligocene magmatism in northern Myanmar.LITHOS,348(0),105211.
MLA Li, JX ,et al."Subduction of Indian continental lithosphere constrained by Eocene-Oligocene magmatism in northern Myanmar".LITHOS 348.0(2019):105211.
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