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1、02第二章+矿床学基础ThesecondchapteristhebasisofmineraldepositsSection1BasicConceptsI.oredepositsDeposit(mineral):ageologicalbodythatisformedbygeologicalactionintheearth'scrustandwhosequalityandquantitymeetindustrialrequirementsandcanbeusedinexistingeconomicandtechnologicalc
2、onditions.Oredepositsarecomposedoforebodiesandsurroundingrocks,andoneormoreorebodiesmaybeincludedinthedeposits.Deposit(mineral):ageologicalbodythatisformedbygeologicalactionintheearth'scrustandwhosequalityandquantitymeetindustrialrequirementsandcanbeusedinexistingec
3、onomicandtechnologicalconditions.Oredepositsarecomposedoforebodiesandsurroundingrocks,andoneormoreorebodiesmaybeincludedinthedeposits.1,syngeneticdeposit(syngeneticdeposits):theorebodyandthesurroundingrockareformedinthesamegeologicalprocessatthesametimeoratthesameti
4、me.2,epigeneticoredeposits(epigenetic,deposits):theformationoforebodiesisobviouslylaterthanakindoforedepositsofsurroundingrock.Two,orebodyandsurroundingrock1,body(ore):anindependentgeologicalbodycomposedofore(ore)andgangue(gangue),isthemaincomponentofthedeposit,andi
5、sthemainobjectofminingandutilization.Theorebodyhasadefiniteshape(form/morphology),sizeandmodeof(occurrence),andoccupiesacertainspatiallocation,surroundedbysurroundingrock.2,(countryrock,hostrockrock,wallrock):referstotheorebodyofsurroundingrock,theboundaryofsomevery
6、clear(suchasvein),andsomeshowedgradualtransition(suchascomposedofveinletdisseminatedoreore).3,rock(mother):referstotheformationoforedepositsintheprocessofprovidingmineralsfromthesourcerock.Itiscloselyrelatedtooredepositsinspaceandgenesis.Magnesianchromiteisthemother
7、rockofCHROMITEDEPOSIT,suchaschromiteoreformationinmagnesianrichultrabasicrockformedbymagmaticcrystallizationdifferentiation.4,theshapeoftheorebody(formoforebody),thatis,theshapeoftheorebody.Theorebodiesaredividedintothreebasictypesaccordingtotheproportionofthelength
8、ofthespaceinthethreedimension1)equiaxedorebody:threeorebodiestobalancetheextension,suchasnodule(diametertensofmetersabove),thenest(thediam
