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1、02第二章+矿床学基础ThesecondchapteristhebasisofmineraldepositsSection1BasicConceptsI.oredepositsDeposit(mineral):ageologicalbodythatisformedbygeologicalactionintheearth'scrustandwhosequalityandquantitymeetindustrialrequirementsandcanbeusedinexistingeconomicandtechnologicalconditions・Oredepositsarecomposedof
2、orebodiesandsurroundingrocks,andoneormoreorebodiesmaybeincludedinthedeposits・Deposit(mineral):ageologicalbodythatisformedbygeologicalactionintheearth'scrustandwhosequalityandquantitymeetindustrialrequirementsandcanbeusedinexistingeconomicandtechnologicalconditions・Oredepositsarecomposedoforebodiesan
3、dsurroundingrocks,andoneormoreorebodiesmaybeincludedinthedeposits・1,syngeneticdeposit(syngeneticdeposits):theorebodyandthesurroundingrockareformedinthesamegeologicalprocessatthesametimeoratthesametime・2,epigeneticoredeposits(epigenetic,deposits):theformationoforebodiesisobviouslylaterthanakindofored
4、epositsofsurroundingrock・Two,orebodyandsurroundingrock1,body(ore):anindependentgeologicalbodycomposedofore(ore)andgangue(gangue),isthemaincomponentofthedeposit,andisthemainobjectofminingandutilization.Theorebodyhasadefiniteshape(form/morphology),sizeandmodeof(occurrence),andoccupiesacertainspatiallo
5、cation,surroundedbysurroundingrock・2,(countryrock,hostrockrock,wallrock):referstotheorebodyofsurroundingrock,theboundaryofsomeveryclear(suchasvein),andsomeshowedgradualtransition(suchascomposedofveinletdisseminatedoreore)・3,rock(mother):referstotheformationoforedepositsintheprocessofprovidingmineral
6、sfromthesourcerock・Itiscloselyrelatedtooredepositsinspaceandgenesis・MagnesianchromiteisthemotherrockofCHROMITEDEPOSIT,suchaschromiteoreformationinmagnesianrichultrabasicrockformedbymagmaticcrystallizationdifferentiation・4,theshapeoftheorebody(formoforebody),thatis,theshapeoftheorebody.Theorebodiesar
7、edividedintothreebasictypesaccordingtotheproportionofthelengthofthespaceinthethreedimension1)equiaxedorebody:threeorebodiestobalancetheextension,suchasnodule(diametertensofmetersabove),thenest(thediam
