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AlterationprocessandwateroriginofNi.Cu depositsinorogenicbelts:Insightsfrom H andO isotopesoftheHuangshannandepositinEastTianshan.

文献类型：期刊论文

作者Zheng XuYang3,4; Mao YaJing4; Miao Jun1; Fang KunGen1; Chen ShouBo2; Xi BinBin2; Qin KeZhang3,4
刊名ACTA PETROLOGICA SINICA
出版日期2023-04-01
卷号39期号:4页码:1075-1094
ISSN号1000-0569
关键词Orogenic Ni-Cu sulfide deposit East Tianshan Huangshannan Alteration Fluid source Hydrogen and oxygen isotopes
DOI10.18654/1000-0569/2023.04.09
英文摘要MagmaticNi.Cusulfidedepositsinorogenicbeltsarecharacterizedbyahighproportionofhydrousmineralphases. However,theroleofwater(fluid) intheminimizationprocessanditsmodificationtothehostrockremainsunclear.Thisstudy investigatesalterationprocessesandwateroriginoftheHuangshannanNi.CudepositinEastTianshanbasedonmineralassemblages andH.Oisotopesofultramaficrocks.Theprimaryrock.formingmineralsintheHuangshannandepositmainlyincludespinel,olivine, orthopyroxeneandclinopyroxene,withasmallamountofinterstitialhornblendeandmica;thesecondarymineralsconsistofamphibole (edenite,actinolite,tremolite,hornblende,andcummingtonite),talc,chlorite,serpentineandcarbonates.Intermsoftexturesand alteredmineralassemblages,theHuangshannanrocksareclassifiedintothreealtereddegrees:low,medium,andsevere. The secondarymineralassemblageandtheamphibolecompositionrevealthattheultramaficrockshaveexperiencedthreestagesof alteration:high.temperature(>700 degrees c,formingcummingtonite+talc+chlorite),medium.temperature(700 similar to 550 degrees c),andlow. temperature(<550 degrees c).Themediumandlow.temperaturealterationsformedcalcicamphibolite+talc+chlorite+serpentineandtalc +carbonate+serpentine,respectively.Notethatthemedium.lowtemperaturemineralassemblagesaremorecommon,probablydueto theoverprintandmodificationatmedium.to.lowtemperaturesstages.Thecontentsofmajorelements(suchasSi,Ca,Na,K,Mn) andsomefluid.mobileelements(suchasRbandBa)inwhole.rockdecreasewiththeincreasingalterationdegree,suggestingthat theseelementswerecarriedoutbyfluidsinanopensystem duringalteration.Theedgeofsulfidemineralscommonlyoccursasa needledshapeinthemedium.to.severealteredrocks,butthesulfidephases,pyrrhotite+pentlandite+chalcopyrite,remainthesame. Thissuggeststhatthedissolutionandmigrationofchalcophileelements(likeNi,CuandS)arelimited.Theultramaficrockswith differentalterationdegreesareenrichedinlighterHisotopes(delta D,-86.6 parts per thousand similar to-128.6 parts per thousand)andhaveawided delta(18)Ovariationof1.7 parts per thousand similar to 10.8 parts per thousand.AlthoughtheH.Oisotopesofsomerocksplotclosetothemixinglinebetweenmagmaticwaterandatmosphericprecipitation, mostsamplescounterthistendency.Mostrockshavesimilard delta(18)OvaluesbutdivergentdDvalues,suggestingthatthefluidsweremainly magmaticwaterthathasundergonefluidexsolution(degassing)invaryingdegrees.Thedegreeofdegassingmaystronglyrelatetothe degreeofmagmafractionation.Thus,itisindicatedthatthealterationoftheHuangshannanrocksresultedfrom"self.alteration"atthe magmaticstage. TheH.O isotopescomparisonofNi.Cudepositsfrom diversetectonicsettingssuggeststhat"self.alteration" is widespreadinultramaficrocks;however,thedepositsinorogenicbeltsmayhavearelativelyhigheralterationdegree
WOS关键词NI SULFIDE DEPOSITS ; NW CHINA ; ISOTOPE ; TIANSHAN ; XINJIANG ; OXYGEN
WOS研究方向Geology
语种英语
出版者SCIENCE PRESS
WOS记录号WOS:000970513600009
源URL[http://ir.iggcas.ac.cn/handle/132A11/110881]  
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Mao YaJing
作者单位1.Xinjiang Ruilun Mine Co Ltd, Hami 839000, Peoples R China
2.Xinjiang Geol Explorat Bur Nonferrous Met, Geol Party 704, Hami 839000, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Zheng XuYang,Mao YaJing,Miao Jun,et al. AlterationprocessandwateroriginofNi.Cu depositsinorogenicbelts:Insightsfrom H andO isotopesoftheHuangshannandepositinEastTianshan.[J]. ACTA PETROLOGICA SINICA,2023,39(4):1075-1094.
APA Zheng XuYang.,Mao YaJing.,Miao Jun.,Fang KunGen.,Chen ShouBo.,...&Qin KeZhang.(2023).AlterationprocessandwateroriginofNi.Cu depositsinorogenicbelts:Insightsfrom H andO isotopesoftheHuangshannandepositinEastTianshan..ACTA PETROLOGICA SINICA,39(4),1075-1094.
MLA Zheng XuYang,et al."AlterationprocessandwateroriginofNi.Cu depositsinorogenicbelts:Insightsfrom H andO isotopesoftheHuangshannandepositinEastTianshan.".ACTA PETROLOGICA SINICA 39.4(2023):1075-1094.

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来源：地质与地球物理研究所

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