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Early Cretaceous bimodal volcanic rocks in the southern Lhasa terrane, south Tibet: Age, petrogenesis and tectonic implications
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; Wang, C
Source PublicationLITHOS
2017
Volume268Issue:0Pages:260-273
DOI10.1016/j.lithos.2016.11.016
AbstractLimited 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.
Subject Area地质学
WOS IDWOS:000392680400017
Language英语
Indexed BySCI
KeywordZIRCON U-PB INDO-ASIAN COLLISION HIGH-ALUMINA BASALTS LITHOSPHERE-ASTHENOSPHERE INTERACTION FORE-ARC BASIN TRACE-ELEMENT ISOTOPIC CONSTRAINTS GANGDESE BATHOLITH GRANITIC-ROCKS GEOCHEMICAL EVIDENCE
WOS Research AreaGeochemistry & Geophysics; Mineralogy
WOS SubjectGeochemistry & Geophysics; Mineralogy ; Geochemistry & Geophysics; Mineralogy
Cooperation Status国内
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8400
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.Sun Yat Sen Univ, Sch Earth Sci & Geol Engn, Guangzhou 510275, Guangdong, Peoples R China.
Recommended Citation
GB/T 7714
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.
APA Wang, C ,Ding, L ,Liu, ZC ,Zhang, LY ,Yue, YH ,&Wang, C.(2017).Early Cretaceous bimodal volcanic rocks in the southern Lhasa terrane, south Tibet: Age, petrogenesis and tectonic implications.LITHOS,268(0),260-273.
MLA Wang, C ,et al."Early Cretaceous bimodal volcanic rocks in the southern Lhasa terrane, south Tibet: Age, petrogenesis and tectonic implications".LITHOS 268.0(2017):260-273.
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