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学科主题: 地球科学::地质学
题名: Petrogenesis of Middle-Late Triassic volcanic rocks from the Gangdese belt, southern Lhasa terrane: Implications for early subduction of Neo-Tethyan oceanic lithosphere
作者: 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
通讯作者: Wang, C
关键词: ZIRCON U-PB ; INDO-ASIAN COLLISION ; ISLAND-ARC BASALTS ; TIBETAN PLATEAU ; HF ISOTOPE ; TECTONIC EVOLUTION ; TRACE-ELEMENT ; NEO-TETHYS ; LU-HF ; EXPERIMENTAL CONSTRAINTS
刊名: LITHOS
发表日期: 2016
DOI: 10.1016/j.lithos.2016.07.021
卷: 262, 期:0, 页:320-333
收录类别: SCI
合作性质: 国际
文章类型: Article
部门归属: 碰撞与隆升
英文摘要: The 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.
语种: 英语
WOS记录号: WOS:000384783500020
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7586
Appears in Collections:图书馆_期刊论文

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作者单位: 1.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:
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.
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