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叶蜡石化蚀变过程中的元素活动性与流体性质:以山西五台-岩石学报
10000569/2017/033(06)187292 ActaPetrologicaSinica 岩石学报
叶蜡石化蚀变过程中的元素活动性与流体性质:
以山西五台地区白云叶蜡石矿为例
张少颖 张华锋
ZHANGShaoYingandZHANGHuaFeng
中国地质大学地球科学与资源学院,北京 100083
SchoolofEarthSciencesandResources,ChinaUniversityofGeosciences,Beijing100083,China
20160610收稿,20160905改回
ZhangSYandZhangHF2017Elementmobilityandfluidcharacteristicsduringpyrophyllitealteration:Acasestudyfrom
theBaiyunpyrophyllitedeposit,WutaiCounty,ShanxiProvinceActaPetrologicaSinica,33(6):1872-1892
Abstract Investigationontheelementmobilityduringhydrothermalalterationprocessescanprovidechallenginginsightsintofluid
propertiesandmetallogenyTheBaiyunpyrophyllitedepositoftheWutaiCounty,ShanxiProvince,providesanaturalcaseforstudyon
fluidpropertiesandelementalmobility,wherethewallrocksmainlyconsistofalbitesericitequartzschist,associatedwithminoralbite
chloriteschistHydrothermalalterationinthemineisdominatedbypyritephyllic(sericitequartzpyrite)andpyrophyllite
(pyrophylliteillitekaolinitequartz)ThegoldmineralizationismainlydevelopedinthepyritephyllicalterationzoneLogf pH
O2
diagramisconstructedtodepictthealterationprocess,andthephasediagramexhibitesthattheearlypyritephyllicalterationfluidwas
weakacidtopartialneutral(pH=524~587)withrelativelylowoxygenfugacity(whichwaslocatedinthestableareaofpyriteand
chalcopyrite)Thealterationfluidleadingtothepyrophyllitealteration,incontrast,wasacidic(pH=207~220)withrelatively
highoxygenfugacity(whichwasabovetheHMbufferline)AccordingtotheimmobilityofAlOfromthepyrophylliteores,themass
2 3
balancecalculationshowsthatthecontentsofSiO,NaOandKOfromthepyrophylliteoresaredramaticallyincreasedbycomparison
2 2 2
withthewallrocks(albitesericitequartzschist),whereas,theothermajoroxideswerepro
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