1、agofrommagmaticfluidsthatoriginatedmoltengranitelikebodiesdeepbeneathsurfaceEarth.Thistheoryiscontrarywidelyheldviewdepositedmetamorphicfluids,is,thatformedduringdehydrationwetsedimentaryrocks.Therecentlydevelopedtheoryhasconsiderablepracticalimportance.Mostgolddepositsdiscoveredtheoriginalrushesexp
2、osedatEarthsandfoundbecausetheyhadshedtrailsalluvialeasilytracedbysimpleprospectingmethods.Althoughthesesamemethodsstillleasanoccasionaldiscovery,mostnotyethavegoneundetectedtheyburiednosurfaceexpression.challengeinexplorationthereforeunravelsubsurfacegeologyanareapinpointpositionminerals.Methodsuse
3、dtodayincludeanalysisaerialimagesyieldbroadgeologicaloverview,geophysicaltechniquesprovidedatamagnetic,electrical,mineralogicalpropertiesrocksbeinginvestigated,sensitivechemicaltestsabledetect:subtlehalosoftenenvelopmineralization.However,nonehigh-technologyanyvalueifsiteswhichappliednevermineralize
4、d,maximizechancesdiscoveryexplorermustpayparticularattentionselectinggroundformationslikelybemineralized.Suchselectionreliesvaryingdegreesconceptualmodels,takeintoaccounttheoreticalstudiesrelevantfactors.Thesemodelsconstructedprimarilyempiricalobservationsknownmineraltheoriesore-formingprocesses.use
5、sidentifythosefeaturescriticalformationmineralizationmodeled,thentriesselectareasforexhibitasmanypossible.1.authorconcernedwith .A.advocatingreturnoldermethodology.B.explainingimportancetheory.C.enumeratingdifferencesbetweenmethodsD.describingeventsleadingdiscovery2.passage,heldveinsuchsystemsAfluid
6、s.BgranitelikebodiesCdepositsDgenerallyexpression3.passageimpliesstepswouldfirstperformedexplorerswho wishtheirdiscoveringgold?Surveyingseveralknownbeenmorethanbillionago.Limitingformmetamorphicfluid.Usingappropriatemodelsitefurtherexploration.analyzerocksarea.4.Whichstatementsaboutdiscoveriesgoldsu
7、pportedinformationpassage?numberdiscovermadeannuallyincreasedtimeofpresentNewresultexplorationtechniquesdesignedlocatemineralizationItunlikelynewlywillevermuchdidrushes.Moderndividedquestionutilitysimplesourcenewdeposits.5.caninferredeasiesttodetect?systemoriginatingmagmaticdepositmixedwithgranite.gold.6.mentionedlineIrelatesdiscussedways?mayfurnishvalidprocesses,hence,cansupportgreatsignificance.suggestscertainformations,longbelievedmineralized,factmineralizedthusconfirmingcurrentmodels.thereenoughsimilarityacrossgold-quartzwarrantformulationcorrectsexistingdeposits,andprovidesbasis
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