geol-minerals(菲律賓礦產(chǎn)分布圖)

1、PHILIPPINEGEOLOGYANDMINERALIZATION:ANOVERVIEWThePhilippinesmaybeviewedasacollageofmetamorphicterranes,magmaticarcs,ophioliticcomplexes,sedimentarybasinsandcontinentalblockofEurasianaffinitysubjectedtotectonicprocessessuchassubduction,collisionandmajorstrikeslipfaulting.Thesubductionzonesarerepresent

2、edontheeastbythewestdippingPhilippineTrenchtraversingtheeasternseaboardofthePhilippinesfromMindanaouptoapointinLuzonandtheEastLuzonTrough.EastdippingsubductionzonesincludetheManilaTrench,NegrosTrenchandCotabatoTrench.ThesouthernterminationoftheManilaTrenchischaracterizedbythetransformationofthesubdu

3、ctionoftheSouthChinaSeaPlateintoanarc-continentcollisionaldeformationwithinMindoroIsland.ThecontinentalblockisrepresentedbynorthernPalawan,southernMindoro,RomblonIslandGroupandBuruangaPeninsulainPanayIsland,knowncollectivelyastheNorthPalawanBlock.Rocksuitesinthisblockincludeschiststhatarecharacteris

4、ticallyrichinquartzandchertformationsthathavebeendatedLatePermiantoJurassic.TherestofthearchipelagoisconsideredasthePhilippineMobileBelt.Approximatelyco-axialwiththemobilebeltisthePhilippineFault,amajorstrikeslipfaultthatapparentlydevelopedpartiallyinresponsetothekinematicforcesfromthesubductionfrom

5、theeastandwestofthemobilebelt.Manyareasofthismobilebeltareunderlainbyophioliticcomplexes.Usuallyoccurringtogetherwithpre-Cenozoicschistsandphyllites,theophioliticrocksrepresentbasementonwhichmagmaticarcshavedeveloped.TheagesoftheophioliticcomplexesrangefromJurassictoearlyPaleogene.Oneofthebeststudie

6、dcompleteophiolitesequenceistheZambalesOphiolitewheretectonizedperidotitesprogresstolayeredandisotropicgabbro,sheeteddikecomplex,pillowbasaltsandfinallypelagicsedimentaryrocks.OtherophioliticcomplexesincludethoseinIsabela,PolilloIsland,easternRizal,CamarinesNorte,CaramoanPeninsula,Mindoro,southernPa

7、lawan,PanayIsland,BoholIsland,LeyteIsland,SamarIsland,DinagatIslandGroup,north-centralZamboanga,MindanaoCentralCordilleraandPujadaPeninsula.Ultramaficrocksoftheseophiolitesarehoststosignificantdepositsofchromiteandnickel.Lateritesovertheserocksalsocontaineconomicdepositsofsecondarynickelminerals.Ont

8、heotherhand,massivesulphideandmanganesedepositsareassociatedwiththevolcanicandsedimentarycarapaceoftheophiolite.Ancientmagmaticarcsinthemobilebeltarecharacterizedbythickvolcanicflowsintercalatedwithpyroclasticandsedimentaryrocksandintrusionsofdiorite,quartzdioriteandandesitictodaciticrocks.Someintru

9、sions,however,haveamorealkaliccharactersuchasthesyenitesinIsabelaandmonzonitesinQuirinoandNuevaVizcaya.Theagesofthedioriteintrusionsvary,fromlateEarlyCretaceous(AlbianinCebutoLateMiocene-Pliocene(BlackMountainQuartzDioriteinBaguioDistrict.Youngervolcanicrocks,occurringasflows,intrusionsandvolcaniced

10、ificesdisposedinlinearbeltsareassociatedwithactivesubductionprocesses.ThesearebestexemplifiedbytheBataanvolcanicbeltandBicolvolcanicchain.SedimentarybasinslocatedbetweenarcsincludetheIlocos-CentralValleyBasin,CagayanValleyBasin,southeastLuzonBasin,VisayanSeaBasin,Agusan-DavaoBasinandCotabatoBasin.Go

11、ldandcopperdepositsinthePhilippinestendtobeclusteredincertainareassuchasLuzonCentralCordillera,CamarinesNorte,SurigaoandDavao,althoughlargedepositsmayalsobefoundelsewhere,asinZambales(Dizonmine,Cebu(AtlasmineandSouthCotabato(Tampakanproject.Manycopper-golddepositsareassociatedwithintrusions(mostlydi

12、oriteandquartzdiorite,butalsomonzonitesandsyenitesaswellasPliocene-Pleistocenevolcanism(LepantomineatMankayan,Benguet.IrondepositsarealsoassociatedwithNeogeneintrusionsofdioriteandquartzdiorite.LegonJ1QuslcrtuiniEMiflttvrHliitirdQujltmiin気JIhhf霽話rilmry-jIieilhn-MMJiinirnthiI-Iehban-ilcunk1!：口醫(yī)-PfH/i

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14、HEPHIUPP1NESLtGENC;NEOCENEIZ-HLi戲曲5rAi.:TSAENGHE8.TfiChjGHSPRINCIPALGOLDDEPOSITSENTHEPHILIPPINESPRINCIPALGOLDDEPOSITSINTHEPHILIPPINESLGENC;CEMCHDICVO.CVJICPOCKS=4gteMEWEiNTpuaimsTRENCHES,TROUGHSjyymim33QOLDDE?OnilBim.LESEMDTP囲CXE-TTKXiHNICKrLCP05.TSCHDMrTEDEPOSITSLUzUNPRINCIPALNICKELANDCHROMITEDEPOSITSINTHEPHILIPPINESUUHAM肝皿昭HELTW_LEGEMDULfH/.MAFICHCCKtBELTSTPEtJCES.TFKX_rsCHROMrrEDEPOSITS,PRINCIPALNICKELANDCHROMITEDEPOSITSINTHEPHILIPPINESPRINCIPALCOPPERDEPOSITSJNTHEPHILIPPINESLEGEHO:CtNUiOltVOLC*MGRDCK5tMIkCMLKEIMTRUSO!S.TPENCUES.H93HSr.CcfpercerosiFS.PRINCIPALCOPPE