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 Publication | JOURNAL OF ASIAN EARTH SCIENCES |
2018-08-01 | |
Volume | 161Issue:0Pages:74-92 |
DOI | 10.1016/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 ID | WOS:000435062400006 |
Language | 英语 |
Indexed By | SCIE |
Keyword | Zircon U-pb Nujiang Metallogenic Belt Au Deposit Copper-deposit Hydrothermal Alteration Southern Qiangtang Phase-equilibria Duolong Porphyry Volcanic-rocks El-salvador |
WOS Research Area | Geology |
WOS Subject | Geosciences, Multidisciplinary |
Cooperation Status | 国际 |
ISSN | 1367-9120 |
Department | 大陆碰撞与高原隆升重点实验室 |
Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.itpcas.ac.cn/handle/131C11/8588 |
Collection | 图书馆 |
Corresponding Author | Li, GM (Li, Guang-Ming) |
Affiliation | 1.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. |
Files in This Item: | ||||||
File Name/Size | DocType | Version | Access | License | ||
2018128.pdf(7604KB) | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text |
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment