Sub-volcanic hydrothermal mineralization of the Wulaga gold deposit, Heilongjiang, China: Evidences from melt and fluid inclusions

	Sub-volcanic hydrothermal mineralization of the Wulaga gold deposit, Heilongjiang, China: Evidences from melt and fluid inclusions
	Xu JiuHua 1; Wei Hao 1; Wang YanHai 1; Zeng QingDong 2; Liu JianMing 2; Wang YongBin 2; Mao Qian 2
刊名	ACTA PETROLOGICA SINICA
	2012-04-01
卷号	28 期号:4 页码:1305-1316
关键词	Melt inclusions Fluid inclusions Subvolcanic rock Wulaga gold deposit Heilongjiang
ISSN号	1000-0569
文献子类	Article
英文摘要	The Wulaga gold deposit, located in the northeastern edge of the joint of Paleo-Asiatic and Pacific tectonic domains, is one of the most important gold deposits in China The ore bodies are mainly hosted in secondary faults of the Wulaga fault, and cryptoexplosive breccia zone within the Tuanjiegou plagioclase granite-porphyry, and in the layer fractures of metamorphic Heilongjiang Group. There are three types of fluid inclusions in quartz phenocryst of plagioclase granite-porphyry, that is, melt inclusions, primary L-V and L-V-S inclusions, as well as secondary L-V inclusions. Glassy melt inclusions are characterized by acid magma (SiO2 = 69. 5% similar to 73. 8%), with the trapping of temperatures higher than 800 degrees C. Secondary L-V inclusions in quartz phenocryst have 210 similar to 350 degrees C of homegenization temperatures (Th), which represents the features of sub-volcanic hydrothermal fluids and are coincide with those of pyrite-white chalcedony quartz stage (Q1), while salinities (5% similar to 7% NaCleqv) are slightly higher than those of Q1. Gold mineralization of the Wulaga can be divided into three stages. Fluid inclusions in pyrite-early white chalcedony quartz stage (stage I) are characterized by aqueous solution with homogenization temperatures of 154 similar to 355 degrees C, mainly in 230 similar to 270 degrees C. Salinities of fluid inclusions are 1. 3% similar to 8. 2% NaCleqv, with densities of 0. 53 similar to 0. 88g/cm(3). Homogenization temperatures of fluid inclusions in smoky gray chalcedony quartz-polymetallic sulfide stage (stage II) are 159 similar to 196 degrees C, mainly in 170 similar to 190 degrees C, with salinities of 2. 2% similar to 3. 2% NaCleqv and densities of 0. 79 similar to 0. 92g/cm(3). Those in calcite of carbonate-quartz stage (stage III) are mainly in 170 similar to 270 degrees C, with salinities of 0. 5% similar to 2. 9% NaCleqv and densities of 0. 80 similar to 0. 88g/cm(3). Ore-forming fluids in the main mineralization stage are characterized by mid to low temperatures, low salinities, and lack of CO2, which is similar with epithermal deposit related with continental volcanic-subvolcanic rocks in the world. Melt and fluid inclusion study show that gold mineralization has a close relationship with plagioclase granite-porphyry, and it is possible for silicate magma to produce salt-aqueous solution through immiscibility in magmatic differentiation. The Wulaga gold deposit should belong to epithermal gold deposit related to Cretaceous plagioclase granite-porphyry.
WOS关键词	FREEZING-POINT DEPRESSION ; AQUEOUS FLUIDS ; IMMISCIBILITY ; PHILIPPINES ; EVOLUTION ; PORPHYRY ; MAGMAS
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000303970100026
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/84472]
专题	中国科学院地质与地球物理研究所
通讯作者	Xu JiuHua
作者单位	1.Univ Sci & Technol Beijing, Dept Resource Engn, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Xu JiuHua,Wei Hao,Wang YanHai,et al. Sub-volcanic hydrothermal mineralization of the Wulaga gold deposit, Heilongjiang, China: Evidences from melt and fluid inclusions[J]. ACTA PETROLOGICA SINICA,2012,28(4):1305-1316.
APA	Xu JiuHua.,Wei Hao.,Wang YanHai.,Zeng QingDong.,Liu JianMing.,...&Mao Qian.(2012).Sub-volcanic hydrothermal mineralization of the Wulaga gold deposit, Heilongjiang, China: Evidences from melt and fluid inclusions.ACTA PETROLOGICA SINICA,28(4),1305-1316.
MLA	Xu JiuHua,et al."Sub-volcanic hydrothermal mineralization of the Wulaga gold deposit, Heilongjiang, China: Evidences from melt and fluid inclusions".ACTA PETROLOGICA SINICA 28.4(2012):1305-1316.