Hypersaline, high-oxygen fugacity and F-rich fluid inclusions in Jiguanshan porphyry molybdenum deposit, Xilamulun metallogenic belt

	Hypersaline, high-oxygen fugacity and F-rich fluid inclusions in Jiguanshan porphyry molybdenum deposit, Xilamulun metallogenic belt
	Wu HuaYing 1,2; Zhang LianChang 1; Chen ZhiGuang 1,2; Wan Bo 2,3; Xiang Peng 1,2; Zhang XiaoJing 1,2
刊名	ACTA PETROLOGICA SINICA
	2010-05-01
卷号	26 期号:5 页码:1363-1374
关键词	Fluid inclusion Fluid boiling Fluid mixing Porphyry molybdenum deposit High-oxygen fugacity fluid Xilamulun metallogenic belt
ISSN号	1000-0569
文献子类	Article
英文摘要	Jiguanshan porphyry molybdenum deposit in the southern part of Xilamulun metallogenic belt, located NE 35km of Chifeng City, tectonically belonged to the northern marginal orogen of North China Block. Molybdenum mineralization is disseminated in the granite porphyry, and is partly developed in the rhyolitic breccia-bearing tuff, rhyolite and diabase occurring as stockwork. Ore minerals in the deposit are mainly molybdenite and pyrite with minor chalcopyrite, sphalerite and magnetite. The gangue minerals in the ores are predominately quartz, feldspar and sericite with minor amounts of calcite and fluorite. Mineral assemblage and crosscutting relationship of the stockworks suggest the ore-forming process may include three stages corresponding to three mineralization-related veins: (1) Quartz-molybdenite veins; (2) Fluorite-(Quartz) -molybdenite polymetallic sulfide veins; (3) Barren fluorite veins. The mineralization-related veins contained abundant various fluid inclusions including aqueous water (W-type), H(2)O-CO(2) (C-type) and daughter mineral-bearing inclusions (S-type). The S-type inclusions are prominent, in which abundant daughter minerals including halite, sylvite, hematite, anhydrite, molybdenite, calcite and some other unknown minerals are contained, and sometimes a single inclusion may contain as much as 4 5 daughter minerals. The presence of hematite, anhydrite and molybdenite indicates that the ore-bearing fluid is high in oxygen fugacity and has strong capacity of carrying the metals. Petrography, laser Raman and microthermometry analysis on inclusions show that the ore-bearing fluid consists of high-temperature, hypersaline and high-oxygen fugacity fluids with magmatic origin and medium-low temperature, low salinity ones derived from the mixing of the meteoric water with magmatic hydrothermal fluids. The high-temperature and hypersaline fluids are characterized by containing S-type inclusions with the forming temperature of over 440 degrees C and salinity of 28% similar to 76% NaCleqv, and some of the inclusions may have a salinity over 76% NaCleqv. While the medium-low temperature, low salinity fluid have a salinity of 0. 9% similar to 20. 3% NaCleqv with a forming temperature of 322 degrees C. Our study show that the precipitation of the metal sulfides mainly occurred at temperature of 310 to 400 C secondly for the temperature of 210 to 320 degrees C. The Jiguanshan deposit is related to the high-temperature, hypersaline and high-oxygen fugacity H(2)O-NaCl fluid system rich in F element and the molybdenum mineralization should be triggered by the temperature dropping, fluid boiling and mixing.
WOS关键词	NORTH CHINA CRATON ; HYDROTHERMAL FLUIDS ; TECTONIC EVOLUTION ; COPPER-DEPOSIT ; INNER-MONGOLIA ; ORE-FLUIDS ; MO DEPOSIT ; NEW-MEXICO ; MARGIN ; GEOCHEMISTRY
WOS研究方向	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000278597800004
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/72516]
专题	中国科学院地质与地球物理研究所
通讯作者	Wu HuaYing
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Wu HuaYing,Zhang LianChang,Chen ZhiGuang,et al. Hypersaline, high-oxygen fugacity and F-rich fluid inclusions in Jiguanshan porphyry molybdenum deposit, Xilamulun metallogenic belt[J]. ACTA PETROLOGICA SINICA,2010,26(5):1363-1374.
APA	Wu HuaYing,Zhang LianChang,Chen ZhiGuang,Wan Bo,Xiang Peng,&Zhang XiaoJing.(2010).Hypersaline, high-oxygen fugacity and F-rich fluid inclusions in Jiguanshan porphyry molybdenum deposit, Xilamulun metallogenic belt.ACTA PETROLOGICA SINICA,26(5),1363-1374.
MLA	Wu HuaYing,et al."Hypersaline, high-oxygen fugacity and F-rich fluid inclusions in Jiguanshan porphyry molybdenum deposit, Xilamulun metallogenic belt".ACTA PETROLOGICA SINICA 26.5(2010):1363-1374.