Characteristics, genetic mechanism, and exploration perspective of Ni-rich sulfide in magmatic Ni-Cu systems

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院矿产资源研究重点实验室

	Characteristics, genetic mechanism, and exploration perspective of Ni-rich sulfide in magmatic Ni-Cu systems
	Mao YaJing 1,2; Qin KeZhang 1,2,3; Tang DongMei 1,2
刊名	ACTA PETROLOGICA SINICA
	2018
卷号	34 期号:8 页码:2410-2424
关键词	Magmatic sulfide deposit High Ni tenor sulfide Huangshannan Poyi Xiarihamu Orogenic Ni-Cu deposit exploration
ISSN号	1000-0569
英文摘要	Nickel content in sulfide ( Ni tenor) is an important parameter in magmatic Ni-Cu deposit. It records Ni content in magma, the degrees of magma evolution and sulfide fractionation. Generally, high-Ni tenor sulfides are believed to be associated with komatiitic magma or alteration processes. However, it is shown that some of the high-Ni tenor sulfides could also be generated by basaltic, picritic magmas without secondary alteration process. This study summarized the characteristics and genetic mechanism of the Ni-Cu deposits having high-Ni tenor sulfides, proposed the discernment sign for different mechanisms, discussed its exploration prospect. The high Ni tenor deposits commonly occur in continental rift and orogenic belts and hosted by olivine-rich rocks, forming by less evolved magmas which are relatively enriched in Ni. The primary Ni-bearing mineral is dominantly by pentlandite, but some komatiitic related deposits are dominated by millerite. According to the Ni tenor in sulfide, the komatiitic related sulfides having higher than 16% Ni could be defined as high-Ni tenor, whereas the non-komatiitic related sulfides could be defined as high Ni tenor ( Ni > 10%) , medium Ni tenor (5% similar to 10%) , and low Ni tenor ( Ni < 5% , Cu > Ni) . The primary high Ni sulfide can be formed by segregation from Ni-rich magma, the absorption of Ni from olivine, the sulfide fractional crystallization, and the reaction of sulfide with sulfur-unsaturated magma. For picritic and basaltic magmas ( relatively Ni-rich) , Fe-Ni exchange between sulfide and olivine is an important mechanism. Whether the partial melting of the pyroxene mantle source is a necessary condition for the formation of high-Ni tenor sulfides remains debatable. The high-Ni sulfides formed by different mechanisms have diverse rock-mineral assemblages and geochemical characteristics, i. e. sulfide mineral assemblages, olivine components ( Fo values, Ni contents, correlations between Fo values versus Ni content) , chalcophile element ( copper, platinum group elements) abundance in sulfide. Thus, these features are valid indicators of the different high-Ni sulfide formation mechanisms. In China, the sulfides in the Huangshannan, Poyi, and Xiarihamu deposits are characterized by high-Ni tenor, whereas those in the Kalatongke deposit are featured by low-Ni and high-Cu tenor. Recent research indicates that Ni-rich sulfide hosting deposits in China were formed by relatively Ni-rich parent magma and FeNi exchange between sulfide and olivine, the latter factor results in 3% similar to 5% Ni tenor increase in the sulfide. For exploration in high-Ni sulfide bearing intrusions, industrial Ni grades could be achieved for sparse disseminated ores, whereas very high Ni grade could be achieved for densely disseminated ores. Therefore, these intrusions are capable of exploring high-grade Ni ores. In orogenic belts, magmas with relatively high oxygen fugacity ( up to QFM + 1) and water may provide favorable conditions for the formation of high-Ni sulfides. In such setting, intrusions with olivine high Fo values ( > 87mol% ) may host high Ni sulfides.
WOS关键词	PLATINUM-GROUP ELEMENTS ; ASIAN OROGENIC BELT ; MAFIC-ULTRAMAFIC INTRUSION ; MONOSULFIDE SOLID-SOLUTION ; TALC-CARBONATE ALTERATION ; WESTERN-AUSTRALIA ; NW CHINA ; OXYGEN BAROMETRY ; EASTERN TIANSHAN ; GREENSTONE-BELT
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000451727800014
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/89606]
专题	地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者	Qin KeZhang
作者单位	1.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Mao YaJing,Qin KeZhang,Tang DongMei. Characteristics, genetic mechanism, and exploration perspective of Ni-rich sulfide in magmatic Ni-Cu systems[J]. ACTA PETROLOGICA SINICA,2018,34(8):2410-2424.
APA	Mao YaJing,Qin KeZhang,&Tang DongMei.(2018).Characteristics, genetic mechanism, and exploration perspective of Ni-rich sulfide in magmatic Ni-Cu systems.ACTA PETROLOGICA SINICA,34(8),2410-2424.
MLA	Mao YaJing,et al."Characteristics, genetic mechanism, and exploration perspective of Ni-rich sulfide in magmatic Ni-Cu systems".ACTA PETROLOGICA SINICA 34.8(2018):2410-2424.