SEM-EDS investigation of daughter minerals of fluid inclusions at the Dexing porphyry Cu-Mo deposit, Jiangxi Province, China

	SEM-EDS investigation of daughter minerals of fluid inclusions at the Dexing porphyry Cu-Mo deposit, Jiangxi Province, China
	Liu Xuan 1; Fan HongRui 1; Hu FangFang 1; Hu BaoGen 2; Zhu XiaoYun 2
刊名	ACTA PETROLOGICA SINICA
	2011-05-01
卷号	27 期号:5 页码:1397-1409
关键词	Dexing porphyry Cu-Mo deposit SEM-EDS REE-bearing daughter minerals Hydrothermal alteration Fluid components
ISSN号	1000-0569
文献子类	Article
英文摘要	A large number of daughter mineral-bearing fluid inclusions formed in Q + Py +/- Cp +/- Cc veins, phyllic rocks and Q + Py + Mo +/- Cp veins at the Dexing porphyry copper-molybdenum deposit, SE China. On the basis of microscopic investigation of the vein (and rock) mineral assemblages and fluid inclusion petrology, Scanning Electron Microscopy and X-ray Energy Dispersive Spectrum (SEM-EDS) were employed in identification of the solid phases in fluid inclusions. Our results suggest that (1) transparent daughter minerals in Q + Py Cp +/- Cc veins include sericite, halite, bischofite, dolomite, iron-bearing chlorides, apatite and Ce-bearing phosphates, and opaque phases consist of hematite, iron-bearing oxides and chalcopyrite; (2) transparent daughter minerals in phyllic rocks include halite, anhydrite, gypsum, sericite, magnesium sulfate, magnesite, magnesium chloride, (Fe, Cu, Mg) carbonate and sulfate, while opaque phase include hematite, magnetite, nitile and chalcopyrite; and (3) daughter minerals in Q + Py + Mo +/- Cp veins are far less developed, which include halite, siderite and K-feldspar for the transparent daughters and hematite for the opaque ones. Various types of daughter minerals in Q + Py Cp +/- Cc veins, phyllic rocks and Q + Py + Mo +/- Cp veins indicate that hydrothermal fluids responsible for their formation are significantly complex in composition and appear to be hypersaline, oxidized and ore minerals enriched. However, detailed alteration mineral observation suggests that Na, Ca, Mg, Fe, which appear in those solid phases are probably contributions from the preexisting minerals (plagioclases, hornblendes, biotites and possibly phosphates) by water/rock reaction in the wall rocks. Furthermore, fluid inclusion petrology indicates that those hypersaline fluid inclusions in the phyllic rocks and Q + Py + Mo +/- Cp veins are likely to be generated from low- or moderate-salinity fluids by fluid-vapor phase separation, which are evidenced by coexistence of daughter mineral-bearing inclusions and vapor-rich inclusions or CO(2)-rich inclusions. Finally, monazites and Ce-bearing phosphates in the fluid inclusions of Q + Py Cp Cc veins suggest that hydrothernial fluids forming these veins are hypersaline, acidic and CO(2)-bearing. Separation of CO, from the liquid phases is likely to account for the absence of the Ce from the fluids of phyllic rocks and Q +Py + Mo +/- Cp veins.
WOS关键词	SCANNING-ELECTRON-MICROSCOPY ; COPPER-MOLYBDENUM DEPOSIT ; PB ZIRCON AGES ; LA-ICP-MS ; SOUTH CHINA ; U-PB ; CATHAYSIA BLOCKS ; BRITISH-COLUMBIA ; YANGTZE BLOCK ; SANTA-RITA
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000292712600014
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/74102]
专题	中国科学院地质与地球物理研究所
通讯作者	Liu Xuan
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Dexing Copper Mine Jiangxi Copper Co Ltd, Dexing 334200, Peoples R China
推荐引用方式 GB/T 7714	Liu Xuan,Fan HongRui,Hu FangFang,et al. SEM-EDS investigation of daughter minerals of fluid inclusions at the Dexing porphyry Cu-Mo deposit, Jiangxi Province, China[J]. ACTA PETROLOGICA SINICA,2011,27(5):1397-1409.
APA	Liu Xuan,Fan HongRui,Hu FangFang,Hu BaoGen,&Zhu XiaoYun.(2011).SEM-EDS investigation of daughter minerals of fluid inclusions at the Dexing porphyry Cu-Mo deposit, Jiangxi Province, China.ACTA PETROLOGICA SINICA,27(5),1397-1409.
MLA	Liu Xuan,et al."SEM-EDS investigation of daughter minerals of fluid inclusions at the Dexing porphyry Cu-Mo deposit, Jiangxi Province, China".ACTA PETROLOGICA SINICA 27.5(2011):1397-1409.