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Petrogenesis of Middle-Late Triassic volcanic rocks from the Gangdese belt, southern Lhasa terrane: Implications for early subduction of Neo-Tethyan oceanic lithosphere
Wang, C (Wang, Chao)1,2; Ding, L (Ding, Lin)1,3; Zhang, LY (Zhang, Li-Yun)1,3; Kapp, P (Kapp, Paul)4; Pullen, A (Pullen, Alex)4; Yue, YH (Yue, Ya-Hui)1,3; Wang, C
Source PublicationLITHOS
2016
Volume262Issue:0Pages:320-333
DOI10.1016/j.lithos.2016.07.021
AbstractThe Gangdese belt is dominantly composed of igneous rocks that formed during the northward subduction of Neo-Tethyan oceanic lithosphere beneath the Lhasa terrane and has played a crucial role in understanding the pre-collisional evolution of southern Tibet. This paper presents new geochronological and geochemical (whole-rock major and trace element and Sr-Nd and zircon Hf isotope) data for recently identified volcanic rocks exposed in Changguo area, southernmost part of the Lhasa terrane. Zircon U-Pb dating from six samples yields consistent ages of 237.1 +/- 1.1 Ma to 211.7 +/- 1.5 Ma for magma emplacement through volcanic eruption, showing the Middle-Late Triassic magmatic activity in the southernmost Gangdese Belt. The Changguo volcanic rocks are mainly composed of basaltic and andesitic rocks and exhibit LILE enrichment and HFSE depletion. They also exhibit relatively uniform Nd-Hf isotopic compositions (epsilon(Nd)(t) = +5.20 to +7.74 and epsilon(Hf)(t)(zircon) = +10.2 to + 15.9). The basaltic magmas were likely sourced from partial melting of sub-arc mantle wedge that was metasomatized by not only the aqueous fluid derived from subducting altered oceanic crust but also hydrous melt derived from subducting seafloor sediments, and subsequently experienced fractional crystallization and juvenile crustal contamination during ascent. The andesitic magmas were generated by partial melting of maficultramafic metasomes through melt/fluid-peridotite reaction at slab-mantle interface. Taking into account the temporal and spatial distribution of the Early Mesozoic magmatic rocks and regional detrital zircon data, we further propose that the northward subduction of Neo-Tethyan oceanic lithosphere beneath the Lhasa terrane commenced by Middle Triassic. (C) 2016 Elsevier B.V. All rights reserved.
Subject Area地质学
WOS IDWOS:000384783500020
Language英语
Indexed BySCI
KeywordZircon U-pb Indo-asian Collision Island-arc Basalts Tibetan Plateau Hf Isotope Tectonic Evolution Trace-element Neo-tethys Lu-hf Experimental Constraints
Cooperation Status国际
Department碰撞与隆升
SubtypeArticle
Citation statistics
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/7586
Collection图书馆
Corresponding AuthorWang, C
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
4.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA
Recommended Citation
GB/T 7714
Wang, C ,Ding, L ,Zhang, LY ,et al. Petrogenesis of Middle-Late Triassic volcanic rocks from the Gangdese belt, southern Lhasa terrane: Implications for early subduction of Neo-Tethyan oceanic lithosphere[J]. LITHOS,2016,262(0):320-333.
APA Wang, C .,Ding, L .,Zhang, LY .,Kapp, P .,Pullen, A .,...&Wang, C.(2016).Petrogenesis of Middle-Late Triassic volcanic rocks from the Gangdese belt, southern Lhasa terrane: Implications for early subduction of Neo-Tethyan oceanic lithosphere.LITHOS,262(0),320-333.
MLA Wang, C ,et al."Petrogenesis of Middle-Late Triassic volcanic rocks from the Gangdese belt, southern Lhasa terrane: Implications for early subduction of Neo-Tethyan oceanic lithosphere".LITHOS 262.0(2016):320-333.
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