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1、51,Precambrianmagnetite,hematiteandmagnetiteconstructioncausesTM.HanUnitedStatesPreparationofmorethanthreehundredpiecesofopticalfilms,beforeandafteroxidationweresignificantlyJiaomirrorBianobserved.TheserockswerecollectedfromthePrecambrianironformationsinthefollowing:1)
2、BiwabikUSALakeSuperiorregionmesabiregion,IronwooGobebicareaandNegauneeMarquettareaandotherplaces.2)LabradorTroughofQuebec,CanadaandAlbaneSokomanLakeareaTemiscamie.3)BrockmanHamerslayregionofWesternAustralia.4)Kuruman,SouthAfricaCapprovinceofTransvaalSupergrouparea.Thei
3、ronformationisessentiallyaccompaniedmainlybychertveins,saltandcarbon-layeredmagneticironoresiliconSuosaltcomposition.Hematitemayhave(containinglessthanmagnetite)maybenone,oroutputintheformofmagnetMinesymbiosis,oroccasionallyirregularenclavesFu.Lostamongstoredinthemagne
4、ticmine.Thefollowingobservationsindicatespecialcauseoxidationplaysakeyroleintheproceduresusedinthestudy:1,astablehematitephaseremainsunchanged.2,mostofthemagnetitestructurealongtheedgeofthepackageearlyexistenceofoxidation,ratherthancleavagesurfaceoxidationofmagnetiteal
5、ongtheedgesoftheseinclusionscanbeseenasearlyhematite(aftermagnetitehematiteillusion),includingmorphologyandthepresenceofresidualhematite(causedbyoxidationbeforeusingtheprogram)toillustratethispoint.3,theearlypresenceofhematiteandmagnetiteorearlygenerationsuccessionorin
6、termittentlyappeartoincreasewiththeproliferation.4,beforemagnetiteformation,someofthehexagonsand第1页diamond-shapedmorphologyduetothepresenceofearlyovergrowthandgrowth(possiblyself-generated)andchange.5,mostoftheearlypresenceofhematiteinclusionsmostlydisorderedarrangemen
7、t,butnearlyhorizontalorientationZheyinotuncommon.6,intheareaofirontobuildsomeofNegauneeclasticlenses,themagnetitedebriscontainingtitaniferousmagnetiteandchromitemagnetiteasacoregrowth.Accordingtotheaboveobservationscanbeenvisaged:A,themajorityofbothnativehematitemayals
8、obeformedduringdiagenetichematitemaybethroughdepositionorafterdepositionofFe(OH)immediatelyfromdehydration.Mightalsob
