Fluid evolution of the Zhunuo porphyry Cu-Mo deposit in Gangdese Tract, Tibet, China: A fluid-inclusion investigation

doi:10.1016/j.oregeorev.2021.104484

CORC > 深海科学与工程研究所 > 中国科学院深海科学与工程研究所 > 深海科学研究部 > 深海极端环境模拟研究实验室

	Fluid evolution of the Zhunuo porphyry Cu-Mo deposit in Gangdese Tract, Tibet, China: A fluid-inclusion investigation
	Dai, Jie 4,5; Chou, I-Ming 3; Pan, Xiaodong 2; Ding, Jun 5; Huang, Yong 5; Yan, Guoqiang 1; Shen, Hualiang 4,5; Ren, Jing 4,5
刊名	ORE GEOLOGY REVIEWS
	2021-12-01
卷号	139 页码:17
关键词	Fluid evolution Zhunuo porphyry Cu-Mo deposit Gangdese Tract in Tibet China A fluid-inclusion investigation
ISSN号	0169-1368
DOI	10.1016/j.oregeorev.2021.104484
通讯作者	Chou, I-Ming
英文摘要	The Zhunuo porphyry Cu-Mo deposit in the western part of south Gangdese porphyry copper belt (GPCB), Tibet, is a large porphyry system. The Cu-Mo mineralization of this deposit is mainly associated with a weakly aluminous I-type Miocene granite porphyry pluton that formed in a post-collisional extensional tectonic setting. Field observations and petrographic studies demonstrate that emplacement of the pluton took place in several intrusive pulses, each with associated hydrothermal activities. Early hydrothermal alteration produced a potassic assemblage, overprinted by later phyllic alteration. At least three main stages of mineralization have been identified: (1) early A stage quartz +K-feldspar + minor sulfide veins; (2) middle stage B1-subtype veins composed of quartz + molybdenite + sporadic sulfide and B2-subtype quartz + pyrite + chalcopyrite veins; and (3) late stage pyrite + quartz D veins. Three types of fluid inclusions (FIs) in quartz were identified in the early and middle stages (i.e., CO2 bearingaqueous vapor (V)-type and liquid (L)-type, and solid (S)-type); only aqueous L-type FIs were observed in the late stage minerals. S-type FIs contain variable solid particles, including halite, calcite, anhydrite (or gypsum), and chalcopyrite, hematite, and an unidentified transparent crystal. Only halite was dissolved during heating. Halitebearing S-type FIs were mainly homogenized by halite dissolution at 300-470 degrees C (S2-type), corresponding to salinities of 38.9-56.3 wt% NaCl equiv.; and minor halite bearing S-type FIs were homogenized to liquid at 360-520 degrees C via vapor disappearance (S1-type), with salinities of 31.9-56.7 wt% NaCl equiv. Other FIs in minerals of A, B1, B2 and D veins were homogenized at temperatures of 350-550 degrees C, 303-500 degrees C, 305-460 degrees C, and 250-347 degrees C with salinities of 3.4-20.9, 2.6-22.4, 4.8-21.8, and 4.7-18.2 wt% NaCl equiv., respectively. These data suggest that the ore fluids forming the Zhunuo deposit changed from high-temperature, low-moderate salinity, CO2-bearing magmatic fluids to low-temperature, low-salinity and CO2-poor meteoric fluids. Phase separation and cooling caused the precipitation of the abundant chalcopyrite in the middle stage B2-subtype veins. The molybdenite mineralization was caused mainly by the decrease of pressure due to the release of CO2, and by phase separation of fluid in the middle stage as recorded in the B2-subtype veins. This hydrothermal oreforming system is different from other magmatic-hydrothermal systems in GPCB, but is similar to the typical CuMo porphyry systems, which were initially CO2-bearing as indicated by the presence of abundant CO2-bearing, low-moderate salinity FIs and calcite-bearing S-type FIs.
WOS关键词	MAGMATIC-HYDROTHERMAL FLUIDS ; PHASE-EQUILIBRIUM PROPERTIES ; COPPER-MOLYBDENUM DEPOSIT ; WT-PERCENT NACL ; SYSTEM H2O-NACL ; GEOCHRONOLOGICAL CONSTRAINTS ; HIGH-TEMPERATURE ; PVTX PROPERTIES ; SOUTHERN TIBET ; ORE DEPOSITION
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000710662500001
内容类型	期刊论文
源URL	[http://ir.idsse.ac.cn/handle/183446/9423]
专题	深海科学研究部_深海极端环境模拟研究实验室
通讯作者	Chou, I-Ming
作者单位	1.China Geol Survey, Tianjin Ctr, Tianjin 300170, Peoples R China 2.Liwu Copper Min Co Ltd, Ganzi 626200, Sichuan, Peoples R China 3.Chinese Acad Sci, Inst Deep Sea Sci & Engn, CAS Key Lab Expt Study Deep Sea Extreme Condit, Sanya 572000, Hainan, Peoples R China 4.Minist Nat Resources, Key Lab Sedimentary Basin & Oil & Gas Resources, Beijing, Peoples R China 5.China Geol Survey, Chengdu Ctr, Chengdu 610081, Peoples R China
推荐引用方式 GB/T 7714	Dai, Jie,Chou, I-Ming,Pan, Xiaodong,et al. Fluid evolution of the Zhunuo porphyry Cu-Mo deposit in Gangdese Tract, Tibet, China: A fluid-inclusion investigation[J]. ORE GEOLOGY REVIEWS,2021,139:17.
APA	Dai, Jie.,Chou, I-Ming.,Pan, Xiaodong.,Ding, Jun.,Huang, Yong.,...&Ren, Jing.(2021).Fluid evolution of the Zhunuo porphyry Cu-Mo deposit in Gangdese Tract, Tibet, China: A fluid-inclusion investigation.ORE GEOLOGY REVIEWS,139,17.
MLA	Dai, Jie,et al."Fluid evolution of the Zhunuo porphyry Cu-Mo deposit in Gangdese Tract, Tibet, China: A fluid-inclusion investigation".ORE GEOLOGY REVIEWS 139(2021):17.