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学科主题: 地球科学::地质学
题名: Early Cretaceous bimodal volcanic rocks in the southern Lhasa terrane, south Tibet: Age, petrogenesis and tectonic implications
作者: Wang, C (Wang, Chao)1, 2; Ding, L (Ding, Lin)1, 3; Liu, ZC (Liu, Zhi-Chao)4; Zhang, LY (Zhang, Li-Yun)1, 3; Yue, YH (Yue, Ya-Hui)1, 3
通讯作者: Wang, C
关键词: ZIRCON U-PB ; INDO-ASIAN COLLISION ; HIGH-ALUMINA BASALTS ; LITHOSPHERE-ASTHENOSPHERE INTERACTION ; FORE-ARC BASIN ; TRACE-ELEMENT ; ISOTOPIC CONSTRAINTS ; GANGDESE BATHOLITH ; GRANITIC-ROCKS ; GEOCHEMICAL EVIDENCE
刊名: LITHOS
发表日期: 2017
DOI: 10.1016/j.lithos.2016.11.016
卷: 268, 期:0, 页:260-273
收录类别: SCI
合作性质: 国内
文章类型: Article
类目[WOS]: Geochemistry & Geophysics; Mineralogy ; Geochemistry & Geophysics; Mineralogy
研究领域[WOS]: Geochemistry & Geophysics; Mineralogy
英文摘要: Limited geochronological and geochemical data from Early Cretaceous igneous rocks of the Gangdese Belt have resulted in a dispute regarding the subduction history of Neo-Tethyan Ocean. To approach this issue, we performed detailed in-situ zircon U-Pb and Hf isotopic, whole-rock elemental and Sr-Nd isotopic analyses on Late Mesozoic volcanic rocks exposed in the Liqiongda area, southern Lhasa terrane. These volcanic rocks are calc-alkaline series, dominated by basalts, basaltic andesites, and subordinate rhyolites, with a bimodal suite. The LA-ICPMS zircon U-Pb dating results of the basaltic andesites and rhyolites indicate that these volcanic rocks erupted during the Early Cretaceous (137-130 Ma). The basaltic rocks are high-alumina (average >17 wt.%), enriched in large ion lithophile elements (LILEs) and light rare earth elements (LREEs), and depleted in high field strength elements (HFSEs), showing subduction-related characteristics. They display highly positive zircon epsilon(Hf)(t) values (+10.0 to +16.3) and whole-rock epsilon(Nd)(t) values ( +5.38 to +7.47). The silicic suite is characterized by low Al2O3 (<15.4 wt.%), Mg-# (<40), and TiO2 (<03 wt.%) abundances; enriched and variable concentrations of LILEs and REEs; and strongly negative Eu anomalies (Eu/Eu* = 0.08-0.19), as well as depleted Hf isotopic compositions (epsilon(Hf)(t) = +4.9 to +16.4) and Nd isotopic compositions (epsilon(Nd)(t) = +526 to +6.71). Consequently, we envision a process of basaltic magmas similar to that of MORB extracted from a source metasomatized by slab-derived components for the petrogenesis of mafic rocks, whereas the subsequent mafic magma under plating triggered partial melting of the juvenile crust to generate acidic magma. Our results confirm the presence of Early Cretaceous volcanism in the southern Lhasa terrane. Combined with the distribution of the contemporary magmatism, deformation style, and sedimentary characteristics in the Lhasa terrane, we favor the suggestion that the Neo-Tethyan oceanic lithosphere was flat-lying beneath the Lhasa terrane during the Early Cretaceous. (C) 2016 Elsevier B.V. All rights reserved.
语种: 英语
WOS记录号: WOS:000392680400017
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/8400
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.Sun Yat Sen Univ, Sch Earth Sci & Geol Engn, Guangzhou 510275, Guangdong, Peoples R China.

Recommended Citation:
Wang, C ,Ding, L ,Liu, ZC ,et al. Early Cretaceous bimodal volcanic rocks in the southern Lhasa terrane, south Tibet: Age, petrogenesis and tectonic implications[J]. LITHOS,2017,268(0):260-273.
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