The Ashele deposit: A recently discovered volcanogenic massive sulfide;Cu-Zu deposit in Xinjiang, China

doi:10.1111/j.1751-3928.1998.tb00005.x

CORC > 中国地质调查局 > 中国地质调查局 > 中国地质科学院矿产资源研究所

	The Ashele deposit: A recently discovered volcanogenic massive sulfide;Cu-Zu deposit in Xinjiang, China
	Wang, DH; Chen, YC; Mao, JW
刊名	RESOURCE GEOLOGY
	1998
卷号	48 期号:1 页码:31-42
关键词	Ashele Cu-Zn deposit volcanogenic massive sulfide deposit Devonian System Xinjiang northwestern China
ISSN号	1344-1698
DOI	10.1111/j.1751-3928.1998.tb00005.x
英文摘要	The Ashele Cu-Zn deposit is a recently discovered volcanogenic massive sulfide deposit in Xinjiang, Northwestern China. It is the largest Cu-Zn deposit in this type of deposits in. China, which were formed in the early period of later Palaeozoic Era. This deposit is hosted within a suit of bimodal submarine volcanic rocks of the Ashele Formation of Lower-Middle Devonian System formed in an environment of paleocontinental margin rift setting. Lensoid orebodies occur between spilitic rocks developed at footwall and quartz-keratophyric tuff at hanging wall. Zonation of metal elements in the Ashele mine is one of typical volcanic-related exhalative Cu-Zn sulfide deposits in the world. Black ores enriched in Pb, Zn and Ag occurs on the top of the No.1 orebody in the Ashele deposit, yellow ores enriched, in Cu in the middle part, and the chalcopyritization stringer below the massive sulfide ores. Zonation of ore-structure in the No.1 orebody is also apparent and corresponds to the zoning of elements, i.e. lamellar and/or banded sulfide-sulfate ores on the top, massive sulfide ores in the middle, and stockwork veinlets associated with altered breccia pipe on the bottom. Four epochs of mineralization in the Ashele deposit has been recognized. The first period of syngenetic-exhalative deposition of sulfides is the main epoch of mineralization, and the ores deposited subsequently subjected to thermo-metamorphism at the second epoch, superimposed by hydrothermal mineralization at the third epoch, and weathered or oxidized at the fourth epoch.;More than 100 categories of minerals have been recognized in the Ashele mine, but only pyrite, chalcopyrite, sphalerite, tetrahedrite, galena, barite, quartz, chlorite, sericite, and calcite-are dominant, making up various types of ores, and alteration pipes or horizons. Studies of ore petrology suggest that the massive ores were volcanogenic and deposited by exhalative process.;Geochemical studies on the Ashele deposit not only confirm the above conclusion, but also indicate that copper were originated from the footwall rocks of spilites through water-rock interaction, while sulfur from deep source by direct exhalation at the fumarolic stage. The vented sulfur was changed into S2- by hydrolysis and the S2- subsequently attracted Cu2+ and Fe2+ to deposit as CuFeS2. The different atomic weights of Fe, Cu, Pb and Zn may be responsible for the both vertical and horizontal zoning pattern of elements. Based on this fact, a new model for the exhalative deposits such as the Ashele deposit is suggested in this paper.
学科主题	矿床地质
WOS关键词	WALL-ROCK ALTERATION ; HYDROTHERMAL ALTERATION ; GEOCHEMISTRY ; METAMORPHISM ; DEFORMATION ; GEOLOGY ; PYRITE
WOS研究方向	Geology ; Mineralogy
语种	英语
出版者	SOC RESOURCE GEOLOGY
WOS记录号	WOS:000082182100005
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37294]
专题	中国地质科学院矿产资源研究所
作者单位	Chinese Acad Geol Sci, Inst Mineral Deposits, Beijing 100037, Peoples R China.
推荐引用方式 GB/T 7714	Wang, DH,Chen, YC,Mao, JW. The Ashele deposit: A recently discovered volcanogenic massive sulfide;Cu-Zu deposit in Xinjiang, China[J]. RESOURCE GEOLOGY,1998,48(1):31-42.
APA	Wang, DH,Chen, YC,&Mao, JW.(1998).The Ashele deposit: A recently discovered volcanogenic massive sulfide;Cu-Zu deposit in Xinjiang, China.RESOURCE GEOLOGY,48(1),31-42.
MLA	Wang, DH,et al."The Ashele deposit: A recently discovered volcanogenic massive sulfide;Cu-Zu deposit in Xinjiang, China".RESOURCE GEOLOGY 48.1(1998):31-42.