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1、02第二章+矿床学基础（Thesecondchapteristhefoundationofthedeposit）Chapteriithefoundationofmineraldeposits§1basicconceptA,thedepositMineraldeposit(mineraldeposit):referstotheformationofgeologicalprocessesintheearth'scrust,whosequalityandquantityareinlinewithindustryrequirementsandcanbe
2、usedintheexistingeconomicandtechnologicalconditions.Theoredepositiscomposedoforebodyandsurroundingrock,whichcanincludeoneormoreorebodies.Mineraldeposit(mineraldeposit):referstotheformationofgeologicalprocessesintheearth'scrust,whosequalityandquantityareinlinewithindustryrequ
3、irementsandcanbeusedintheexistingeconomicandtechnologicalconditions.Theoredepositiscomposedoforebodyandsurroundingrock,whichcanincludeoneormoreorebodies.1.Syngeneticdeposits:theorebodyandthesurroundingrockareformedsimultaneouslyornearthesametimeinthesamegeologicalprocess.2.E
4、pigeneticdeposit(epigeneticdeposit):theformationoforebodyisobviouslylaterthanthatofsurroundingrocks.OrebodiesandsurroundingrocksOrebody:anindependentgeologicalbodycomposedofore(ore)andgangue,themaincomponentoftheoredeposit,isthemainobjectofexploitationandutilization.Theorebo
5、dyhascertainshape(form/morphology),sizeandmodeofoccurrence,andoccupiesacertainspaceposition,surroundedbysurroundingrocks.2,surroundingrock(countryrock,thehostrock,wallrock):referstothesurroundingrock,orebodiesitsboundarieshaveveryclear(e.g.,nervationorebody),somearegradientt
6、ransition(e.g.,madeupofthinoreveindisseminatedorebody).3.Motherrock:itreferstotherocksthatprovidethesourceofmetallogenicmaterialsduringtheformationofdeposits.Thedepositiscloselyrelatedtothespatialandgeneticfactors.Ifthechromitedepositinthesuper-magnesitesuperbaserockformedby
7、thecrystallizationofmagma,themetaflaseisthemotherrockofthechromitedeposit.4.Theformoforebodyistheshapeoftheorebody.Therearethreebasictypesoforebodyaccordingtothedifferenceoftheratioofthreedimensions1)isoaxialorebodies:three-to-equilibriumextensionoforebodies,suchasore(moreth
8、an10metersindiameter),orenests(morethanafewmetersindiameter),orebagsandorec
