Evolution of ore fluids in the Donggou giant porphyry Mo system, East   Qinling, China, a new type of porphyry Mo deposit: Evidence from fluid   inclusion and H-O isotope systematics

doi:10.1016/j.oregeorev.2014.09.011

CORC > 北京大学 > 地球与空间科学学院

	Evolution of ore fluids in the Donggou giant porphyry Mo system, East Qinling, China, a new type of porphyry Mo deposit: Evidence from fluid inclusion and H-O isotope systematics
	Yang, Yong-Fei ; Chen, Yan-Jing ; Pirajno, Franco ; Li, Nuo
刊名	ore geology reviews
	2015
关键词	Ore fluids Fluid inclusion Isotope Porphyry Mo deposit Qinling Orogen Post-collision ZIRCON U-PB MESOZOIC MOLYBDENUM DEPOSITS MAGMATIC-HYDROTHERMAL FLUID FREEZING-POINT DEPRESSION DABIE OROGENIC BELT WT-PERCENT NACL HENAN PROVINCE COLUMBIA SUPERCONTINENT TECTONIC IMPLICATIONS GRANITOID MAGMATISM
DOI	10.1016/j.oregeorev.2014.09.011
英文摘要	The Donggou Mo deposit in the eastern Qinling area, China, is a giant porphyry system discovered based on a targeting concept by using the tectonic model for collisional orogeny, metallogeny and fluid flow (CMF model). Mo mineralization is associated with the Donggou aluminous A-type granite porphyry and was formed during the Early Cretaceous in a tectonic regime of continental extension. The orebodies mainly occur as numerous veinlets in the host-rocks. Hydrothermal ore-forming processes include at least three stages, characterized by veinlets of (1) quartz + K-feldspar + minor molybdenite, (2) quartz + molybdenite +/- beryl and (3) quartz + carbonate + fluorite. Three types of fluid inclusions (FIs) are distinguished in quartz and beryl in stages 1 and 2, i.e., aqueous (W-type), carbonic-aqueous (C-type) and solid-bearing (S-type), with only aqueous FIs observed in stage 3 minerals. S-type FIs contain variable daughter minerals including halite, chalcopyrite, calcite and an unidentified transparent crystal, but only halite can dissolve during heating. Halite-bearing S-type FIs are mainly homogenized by halite dissolution at 182-416 degrees C, corresponding to salinities of 30.9-49.2 wt.% NaCl equiv.; minor halite-bearing S-type FIs are homogenized to liquid at 190-360 degrees C via vapor disappearance, with salinities of 29.1-36.2 wt.% NaCl equiv. Other FIs in minerals of stages 1, 2 and 3 are homogenized at temperatures of 341-550 degrees C, 220-440 degrees C and 125-225 degrees C, with salinities of 8.0-18.3, 5.3-16.8 and 0.5-7.3 wt.% NaCl equiv., respectively. The estimated minimum trapping pressures are up to 141 MPa in stage 1 and up to 81 MPa in stage 2, respectively, corresponding to an initial mineralization depth of no less than 5 km. The quartz in veinlets yields delta O-18 values of 85-10.0%0, corresponding to delta(OH2O)-O-18 values of -2.9 to 5.9%., while the delta D-H2O values of fluid inclusions range from -59 to -82%.. These data suggest that the ore fluids forming the Donggou deposit changed from high-temperature, high-salinity, CO2-rich magmatic to low-temperature, low-salinity and CO2-poor meteoritic fluids via boiling and mixing, resembling those of other magmatic-hydrothermal systems in Qinling Orogen and Dabie Shan. This supports the notion that the porphyry systems generated in a post-collisional tectonic setting were initially CO2-rich, as indicated by abundant C-type and CO2-bearing S-type fluid inclusions. (C) 2014 Elsevier B.V. All rights reserved.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000348084400009&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geology; Mineralogy; Mining & Mineral Processing; SCI(E); EI; 24; ARTICLE; P1; 148-164; 65
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/206342]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Yang, Yong-Fei,Chen, Yan-Jing,Pirajno, Franco,et al. Evolution of ore fluids in the Donggou giant porphyry Mo system, East Qinling, China, a new type of porphyry Mo deposit: Evidence from fluid inclusion and H-O isotope systematics[J]. ore geology reviews,2015.
APA	Yang, Yong-Fei,Chen, Yan-Jing,Pirajno, Franco,&Li, Nuo.(2015).Evolution of ore fluids in the Donggou giant porphyry Mo system, East Qinling, China, a new type of porphyry Mo deposit: Evidence from fluid inclusion and H-O isotope systematics.ore geology reviews.
MLA	Yang, Yong-Fei,et al."Evolution of ore fluids in the Donggou giant porphyry Mo system, East Qinling, China, a new type of porphyry Mo deposit: Evidence from fluid inclusion and H-O isotope systematics".ore geology reviews (2015).