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Petrogenesis and tectonic setting of Early Cretaceous granodioritic porphyry from the giant Rongna porphyry Cu deposit, central Tibet
Zhang, XN (Zhang, Xia-Nan)1,2,3; Li, GM (Li, Guang-Ming)1,4; Qin, KZ (Qin, Ke-Zhang)1,4; Lehmann, B (Lehmann, Bernd)3; Li, JX (Li, Jin-Xiang)4,5; Zhao, JX (Zhao, Jun-Xing)1; Cao, MJ (Cao, Ming-Jian)1; Zou, XY (Zou, Xin-Yu)1,2
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
2018-08-01
Volume161Issue:0Pages:74-92
DOI10.1016/j.jseaes.2018.05.006
Abstract

The Rongna Cu-(Au) deposit is a recently discovered giant low-grade composite porphyry-high sulfidation epithennal system in the Duolong ore district of central Tibet. We present zircon U-Pb ages, bulk-rock geo-chemical and Sr-Nd isotope data, as well as zircon Hf-O isotope data to constrain the petrogenesis of the Rongna granodioritic porphyry, on which the ore system is centered. Secondary ion mass spectrometry (SIMS) zircon U-Pb data for two samples yielded ages of 118.7 +/- 0.9 Ma and 117.1 +/- 0.9 Ma, respectively. The granodioritic porphyry is of high-K talc-alkaline and magnetite-series affinity, with enrichment of light rare earth elements (LREEs) and large-ion lithophile elements (e.g., Rb, Pb, and K), and depletion of high-field strength elements (e.g., Ta, Nb, and Ti), typical of the geochemical signature of arc magmas. The Rongna granodioritic porphyry has initial Sr isotopic ratios of 0.7060-0.7099, and epsilon(Nd)(t) values of -5.7 to -1.7 with T-DM (Nd) of 983-1900 Ma. The zircons have relatively narrow Hf-O isotopic compositions (epsilon(Hf)(t) = + 3.30- + 6.43; 8180 = + 5.94- + 6.96 parts per thousand), indicating the involvement of old crustal materials. Our data suggest that the Rongna granodioritic porphyry likely evolved by fractional crystallization from a hybrid magma of mantle-derived mafic melts and lower crustal felsic melts during a period of magmatic flare-up following flat-slab subduction.

Subject Area地质学
WOS IDWOS:000435062400006
Language英语
Indexed BySCIE
KeywordZircon U-pb Nujiang Metallogenic Belt Au Deposit Copper-deposit Hydrothermal Alteration Southern Qiangtang Phase-equilibria Duolong Porphyry Volcanic-rocks El-salvador
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
Cooperation Status国际
ISSN1367-9120
Department大陆碰撞与高原隆升重点实验室
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8588
Collection图书馆
Corresponding AuthorLi, GM (Li, Guang-Ming)
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China;
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China;
3.Tech Univ Clausthal, Mineral Resources, Adolph Roemer Str 2A, D-38678 Clausthal Zellerfeld, Germany;
4.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100085, Peoples R China;
5.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China.
Recommended Citation
GB/T 7714
Zhang, XN ,Li, GM ,Qin, KZ ,et al. Petrogenesis and tectonic setting of Early Cretaceous granodioritic porphyry from the giant Rongna porphyry Cu deposit, central Tibet[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,161(0):74-92.
APA Zhang, XN .,Li, GM .,Qin, KZ .,Lehmann, B .,Li, JX .,...&Zou, XY .(2018).Petrogenesis and tectonic setting of Early Cretaceous granodioritic porphyry from the giant Rongna porphyry Cu deposit, central Tibet.JOURNAL OF ASIAN EARTH SCIENCES,161(0),74-92.
MLA Zhang, XN ,et al."Petrogenesis and tectonic setting of Early Cretaceous granodioritic porphyry from the giant Rongna porphyry Cu deposit, central Tibet".JOURNAL OF ASIAN EARTH SCIENCES 161.0(2018):74-92.
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