Geology and origin of the post-collisional Narigongma porphyry Cu-Mo deposit, southern Qinghai, Tibet

doi:10.1016/j.gr.2013.07.012

	Geology and origin of the post-collisional Narigongma porphyry Cu-Mo deposit, southern Qinghai, Tibet
	Yang, Zhiming 1; Hou, Zengqian ; Xu, Jifeng 2; Bian, Xiongfei 3; Wang, Guiren 4; Yang, Zhusen 5; Tian, Shihong 5; Liu, Yingchao ; Wang, Zhaolin
刊名	GONDWANA RESEARCH
	2014
卷号	26 期号:2 页码:536-556
关键词	Porphyry Cu deposits Post-collisional setting High-K adakite Narigongma Tibet
ISSN号	1342-937X
DOI	10.1016/j.gr.2013.07.012
英文摘要	Narigongma is a poorly studied Mo-rich (similar to 0.06 wt.%) post-collisional porphyry Cu deposit located in southern Qinghai Province, Tibet, 400 km northwest of the Yulong porphyry Cu-Mo-Au belt. The Narigongma deposit has a similar age (43-40 Ma) to porphyry deposits in the Yulong belt, but different ore assemblages. The Narigongma deposit is associated with Eocene granodiorite and granite intrusions that were emplaced into a Permian volcanic-sedimentary rock sequence. An similar to 43.3 Ma biotite granite stock (P1 porphyry) is the earliest Eocene intrusion, and this was itself intruded by a number of smaller, similar to 43.6 Ma fine-grained granite porphyry stocks (P2 porphyry) and several post-ore quartz diorite porphyry dikes (similar to 41.7 Ma). The main Cu-Mo mineralization at Narigongma is associated with the P1 porphyry. Hydrothermal alteration surrounding the deposits is generally characterized by concentric zones that range from an inner potassic zone outward to phyllic and argillic alteration zones, and an outer propylitic zone. Hypogene mineralization at Narigongrna was characterized by early-stage precipitation of molybdenite during potassic alteration and late-stage deposition of chalcopyrite during phyllic alteration. Deposition of both the Mo and Cu mineralization stages was caused by decreasing temperature. A high degree of crystallization of the P1 porphyry occurred prior to fluid saturation that produced Mo enrichment in the residual melt due to the incompatible behavior of Mo. However, compatible Cu was sequestered by the crystallizing phases and resulted in the generation of a high-Mo/Cu magmatic-hydrothermal fluid and the final Mo +/- Cu mineralization assemblage. Zircon epsilon(Hf)(t) values of +4.1 to +7.9 are indicative of magma derivation from a depleted source. These isotopic data, coupled with other geochemical characteristics of the Narigongma porphyry, such as high SiO2 and K2O contents, low MgO contents and compatible element abundances, and highly fractionated rare earth element patterns, indicate a mixing model for the origin of the porphyry bodies. Generation of the post-collisional ore-forming porphyries occurred in two stages: (1) partial melting of metasomatized phlogopite-bearing lithospheric mantle that generated potassic to ultra-potassic mafic melts, and (2) underplating of such melts beneath thickened juvenile lower crust, which triggered partial melting of the lower crust to produce the ore-forming, high-K adakitic magma. (C) 2013 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
学科主题	矿床地质
WOS关键词	U-PB GEOCHRONOLOGY ; SR-ND-PB ; TECTONIC EVOLUTION ; COPPER-DEPOSITS ; ORE-DEPOSITS ; CONTINENTAL COLLISION ; ISOTOPIC COMPOSITIONS ; BINGHAM PORPHYRY ; NORTHERN TIBET ; EASTERN TIBET
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000339037800010
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40592]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 2.James Cook Univ, EGRU Econ Geol Res Ctr, Sch Earth & Environm Sci, Townsville, Qld 4811, Australia 3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China 4.Shenyang Inst Geol & Mineral Resources, Shenyang 110034, Peoples R China 5.Qinghai 5th Explorat Fac Geol & Mineral Resources, Xining 810012, Peoples R China 6.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Yang, Zhiming,Hou, Zengqian,Xu, Jifeng,et al. Geology and origin of the post-collisional Narigongma porphyry Cu-Mo deposit, southern Qinghai, Tibet[J]. GONDWANA RESEARCH,2014,26(2):536-556.
APA	Yang, Zhiming.,Hou, Zengqian.,Xu, Jifeng.,Bian, Xiongfei.,Wang, Guiren.,...&Wang, Zhaolin.(2014).Geology and origin of the post-collisional Narigongma porphyry Cu-Mo deposit, southern Qinghai, Tibet.GONDWANA RESEARCH,26(2),536-556.
MLA	Yang, Zhiming,et al."Geology and origin of the post-collisional Narigongma porphyry Cu-Mo deposit, southern Qinghai, Tibet".GONDWANA RESEARCH 26.2(2014):536-556.