气候变化领域集成服务门户(CCPortal): Petrogenesis of ore-bearing porphyries from the Duolong porphyry Cu-Au deposit, central Tibet: Evidence from U-Pb geochronology, petrochemistry and Sr-Nd-Hf-O isotope characteristics

CCPortal

DOI	10.1016/j.lithos.2012.12.015
	Petrogenesis of ore-bearing porphyries from the Duolong porphyry Cu-Au deposit, central Tibet: Evidence from U-Pb geochronology, petrochemistry and Sr-Nd-Hf-O isotope characteristics
	Li, Jin-Xiang; Qin, Ke-Zhang; Li, Guang-Ming; Xiao, Bo; Zhao, Jun-Xing; Cao, Ming-Jian; Chen, Lei
通讯作者	Li, JX (通讯作者)
发表日期	2013
ISSN	0024-4937
EISSN	1872-6143
起始页码	216
结束页码	227
卷号	160
英文摘要	The Duolong porphyry Cu-Au deposit (5.4 Mt at 0.72% Cu, 41 t at 0.23 g/t Au), which is related to the granodiorite porphyry and the quartz-diorite porphyry from the Bangongco copper belt in central Tibet, formed in a continental arc setting. Here, we present the zircon U-Pb ages, geochemical whole-rock, Sr-Nd whole-rock and zircon in-situ Hf-O isotopic data for the Duolong porphyries. Secondary ion mass spectrometry (SIMS) zircon U-Pb analyses for six samples yielded consistent ages of similar to 118 Ma, indicating a Cretaceous formation age. The Duolong porphyries (SiO2 of 58.81-68.81 wt.%, K2O of 2.90-5.17 wt%) belong to the high-K calc-alkaline series. They show light rare earth element (LREE)-enriched distribution patterns with (La/Yb)(N) = 6.1-11.7, enrichment in large ion lithophile elements (e.g., Cs, Rb, and Ba) and depletion of high field strength elements (e.g., Nb), with negative Ti anomalies. All zircons from the Duolong porphyries share relatively similar Hf-O isotopic compositions (delta O-18 = 5.88-727%.; epsilon Hf(t) =3.6-7.3), indicating that they crystallized from a series of cogenetic melts with various degrees of fractional crystallization. This, along with the general absence of older inherited zircons, rules out significant crustal contamination during zircon growth. The zircons are mostly enriched in delta O-18 relative to mantle values, indicating the involvement of an O-18-enriched crustal source in the generation of the Duolong porphyries. Together with the presence of syn-mineralization basaltic andesite, the mixing between silicic melts derived from the lower crust and evolved H2O-rich mafic melts derived from the metasomatized mantle wedge, followed by subsequent fractional crystallization (FC) and minor crustal contamination in the shallow crust, could well explain the petrogenesis of the Duolong porphyries. Significantly, the hybrid melts possibly inherited the arc magma characteristics of abundant F, Cl, Cu, and Au elements and high oxidation state, which contributed to the formation of the Duolong porphyry Cu-Au deposit. (C) 2013 Elsevier B.V. All rights reserved.
关键词	MAGMATIC-HYDROTHERMAL EVOLUTION ZIRCON REFERENCE MATERIAL COPPER-DEPOSIT TRACE-ELEMENT ARC MAGMAS LU-HF FRACTIONAL CRYSTALLIZATION ADAKITIC PORPHYRIES MINERAL CHEMISTRY HIGH-TEMPERATURE
英文关键词	Duolong porphyry Cu-Au deposit; Zircon Hf-O isotope; Petrogenesis; Tibet
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:000316035600013
来源期刊	LITHOS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258147
推荐引用方式 GB/T 7714	Li, Jin-Xiang,Qin, Ke-Zhang,Li, Guang-Ming,et al. Petrogenesis of ore-bearing porphyries from the Duolong porphyry Cu-Au deposit, central Tibet: Evidence from U-Pb geochronology, petrochemistry and Sr-Nd-Hf-O isotope characteristics[J]. 中国科学院青藏高原研究所,2013,160.
APA	Li, Jin-Xiang.,Qin, Ke-Zhang.,Li, Guang-Ming.,Xiao, Bo.,Zhao, Jun-Xing.,...&Chen, Lei.(2013).Petrogenesis of ore-bearing porphyries from the Duolong porphyry Cu-Au deposit, central Tibet: Evidence from U-Pb geochronology, petrochemistry and Sr-Nd-Hf-O isotope characteristics.LITHOS,160.
MLA	Li, Jin-Xiang,et al."Petrogenesis of ore-bearing porphyries from the Duolong porphyry Cu-Au deposit, central Tibet: Evidence from U-Pb geochronology, petrochemistry and Sr-Nd-Hf-O isotope characteristics".LITHOS 160(2013).