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Emplacement age of leucogranite in the Kampa Dome, southern Tibet
Liu, XC (Liu, Xiao-Chi)1; Wu, FY (Wu, Fu-Yuan)1; Yu, LJ (Yu, Liang-Jun)1; Liu, ZC (Liu, Zhi-Chao)2; Ji, WQ (Ji, Wei-Qiang)1; Wang, JG (Wang, Jian-Gang)1; Liu, XC
Source PublicationTECTONOPHYSICS
2016
Volume667Issue:0Pages:163-175
DOI10.1016/j.tecto.2015.12.001
AbstractHimalayan leucogranite is an important rock to decipher the orogenic evolution of the Himalayan orogen. It has been recognized that the leucogranite occurred as two separate, but parallel belts within Himalaya. Leucogranite in the north belt is mainly exposed an intrusion component within the gneissic dome. Although most domes have been intensively studied, the Kampa Dome, located in the east of Southern Tibet, is less investigated due to its inaccessibility. In this study, we conducted a comprehensive set of U(-Th)-Pb zircon, monazite and xenotime dating and trace element composition analyses using laser ablation technique, in order to constrain the emplacement age and lithological nature of the Kampa leucogranite. Zircons from gneiss are mainly magmatic and define a protolith age of ca. 498 Ma, but no Cenozoic age is documented. Zircons from leucogranite display inherited magmatic core overgrown by thin dark rim, which occasionally gives a much younger age of 27.7 +/- 1.0 Ma. However, monazites from leucogranite yield a Th-Pb age of 25.7 +/- 0.5 Ma to 26.8 +/- 0.4 Ma, which is comparable to the U-Pb age of 24.8 +/- 0.4 Ma obtained from xenotimes. For the granitic gneiss into which the leucogranite intruded, monazites and xenotimes give ages of 25.8 +/- 0.6 Ma to 26.6 +/- 0.8 Ma and 25.0 +/- 0.4 Ma to 26.0 +/- 1.0 Ma, respectively. These ages are comparable to those obtained from the leucogranite, and suggest that the metamorphic monazite and xenotime from gneiss formed during the leucogranite emplacement Trace element analyses indicated that zircons from leucogranite have high P (up to 3721 ppm) and REE concentrations, but have low in Th/U ratios (0.04-0.16). Similarly, monazites from leucogranite generally show extreme HREE depletion and significant negative Eu anomaly with some displaying significantly tetrad effect These geo-chemical features indicated that the Kampa leucogranite was highly fractionated during its evolution. (C) 2015 Elsevier B.V. All rights reserved.
Subject Area地质学
WOS IDWOS:000378099700011
Language英语
Indexed BySCI
KeywordHimalayan Gneiss Domes India-asia Collision Central Nepal Manaslu Rb-sr Systematics U-pb Tethyan Himalaya Zircon Geochronology Tectonic Evolution Crustal Anatexis Kangmar Dome
Cooperation Status国内
Department碰撞与隆升
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/7777
Collection图书馆
Corresponding AuthorLiu, XC
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Liu, XC ,Wu, FY ,Yu, LJ ,et al. Emplacement age of leucogranite in the Kampa Dome, southern Tibet[J]. TECTONOPHYSICS,2016,667(0):163-175.
APA Liu, XC .,Wu, FY .,Yu, LJ .,Liu, ZC .,Ji, WQ .,...&Liu, XC.(2016).Emplacement age of leucogranite in the Kampa Dome, southern Tibet.TECTONOPHYSICS,667(0),163-175.
MLA Liu, XC ,et al."Emplacement age of leucogranite in the Kampa Dome, southern Tibet".TECTONOPHYSICS 667.0(2016):163-175.
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