Symplectite of Pyrite and Magnetite in the Massive Sulphide Ore of the Mashan Mine,Anhui Province

(整期优先)网络出版时间:1997-04-14
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AsymplectiteofpyriteandmagnetiteinthemassivesulphideoreoftheMashanmine,AnhuiProvince,isinterpretedtohavebeenformedbytheirreplacingearlierpyrrhotite.Thecompositionsofpyrrhotite,pyriteandmagnetiterelatedtothistexturearegivenbyelectronmicroprobeanalysis.Suchatextureislikelytobeformedwhentheore-formingsystemreachesthethree-phasepointofpyrrhotite,pyriteandmagnetitefromthepyrrhotitestabilityfield.Theverysmallprobabilityforthesystemtoreachthispointcouldbeusedtoaccountfortherareoccurrenceofsuchsymplectiteinnaturalores.