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	Stable isotopic compositions of the hongshan skarn copper deposit in the zhongdian area and its implication for the copper mineralization process
	Wang ShouXu1,2; Zhang XingChun1; Leng ChengBiao1,2; Qin ChaoJian1; Wang WaiQuan3; Zhao MaoChun4
刊名	Acta petrologica sinica
	2008-03-01
卷号	24期号:3页码:480-488
关键词	Stable isotope Hongshan skarn copper deposit Zhongdian
ISSN号	1000-0569
通讯作者	Wang shouxu(wsx361@163.com)
英文摘要	The hongshan cu deposit is located in the zhongdian area which lies on the southern part of the yidun island are. it is a medium sized skarn copper deposit formed during the westward subduction of the ganzi-litang oceanic basin in late triassic. generally, the skarn bodies are copper orebodies or copper mineralized bodies occurred in stratoid, bedded, veining and lentoid forms mainly in the contact between marble and hornfels with minor in hornfels. no direct contact between the skarn and intrusive bodies has been observed. the stable isotopic compositions of various kinds of minerals including garnet, magnetite, pyrrhotite, pyrite, chalcopyrite, calcite, which were formed in different stages, and marble have been analyzed respectively. the results indicate that the delta o-18(smow) values of the garnet, major mineral component of the skarn, are varied from 6.2 parts per thousand to 8.3 parts per thousand, indicating the oxygen isotopic compositions of skam could inherited those of the concealed porphyry body. the oxygen isotopic compositions of magnetite have been used to calculate the delta o-18(smow) values of the ore-forming fluid at magnetitization stage. they are 13.1 similar to 14.7 parts per thousand at assumed temperature of 400 degrees c or 12.5 similar to 14.1 parts per thousand at assumed temperature of 500 degrees c respectively. this indicates that the delta o-18-enriched co2 was dissolved into the ore-forming fluid. the delta o-34(cdt) values of sulfides, varying from 4.45 parts per thousand to 6.20 parts per thousand, indicate that the sulfur of the sulfides in the deposit is from a highly homogeneous source, with very weak sulfur isotopic fractionation in the process of sulfide crystallization and precipitation in the ore-forming fluid. thus, it is suggested that the delta s-34(sigma s), value of the ore-forming fluid of the main ore-stage is 5.6 +/- 0.6 parts per thousand. the delta o-13(pdb) value of 2.0 similar to 2.2 parts per thousand and the delta o-18(smow) value of 24.0 similar to 24.8 parts per thousand for the marble in the deposit indicate that the marble was re-crystallized from the oceanic carbonate. the delta o-13(pdb) value of -2.4 similar to 1.7 parts per thousand and the delta o-18(smow) value of 16.3 similar to 22.4 parts per thousand for the calcite vein formed in the late ore-stage indicate that the carbon and oxygen of calcite vein are mainly sourced from the marble. in general, it is suggested that the hongshan skarn could be formed in the lithological transition zone between the clastic rocks and carbonate with the crystallization of a sio2, al2o3, fe2o3, cao-rich secondary magma which was formed through the assimilation of carbonate by the underneath porphyry magma. it is also believed that the ore-forming materials and the ore-forming fluid of the skam mineralization in the hongshan deposit are congenetic to those of the porphyry copper mienralization underneath.
WOS关键词	SYSTEM ; CHINA ; GEOCHEMISTRY ; SULFUR
WOS研究方向	Geology
WOS类目	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000259117700008
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2392451
专题	中国科学院大学
通讯作者	Wang ShouXu
作者单位	1.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 3.Yunnan Geol Survey, Branch Mineral Resources Invest, Dali 671000, Peoples R China 4.Yunnan Inst Geol Explorat, Dali Branch Mineral Resources, Dali 671000, Peoples R China
推荐引用方式 GB/T 7714	Wang ShouXu,Zhang XingChun,Leng ChengBiao,et al. Stable isotopic compositions of the hongshan skarn copper deposit in the zhongdian area and its implication for the copper mineralization process[J]. Acta petrologica sinica,2008,24(3):480-488.
APA	Wang ShouXu,Zhang XingChun,Leng ChengBiao,Qin ChaoJian,Wang WaiQuan,&Zhao MaoChun.(2008).Stable isotopic compositions of the hongshan skarn copper deposit in the zhongdian area and its implication for the copper mineralization process.Acta petrologica sinica,24(3),480-488.
MLA	Wang ShouXu,et al."Stable isotopic compositions of the hongshan skarn copper deposit in the zhongdian area and its implication for the copper mineralization process".Acta petrologica sinica 24.3(2008):480-488.

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