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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霁話rilmry-jIieilhn-MMJiinirnthiI-Iehban-ilcunk1!:口醫-PfH/i
13、叫訓nc-undifTiiTnEiHkl|iCrrtimwti*-cindifm.niiitpJ|tIttaKG山、$ukurlkA1J-uruikkmIiiikjiIjhitniiukalidhfcMi-zvk-UhdlilTtanEiHU|lkMiuir4iiilhhfmk-mei:amiirphic|Aridinfruho|Mnficrntraina|4idilcIMfljihycLEGEND;CEMOmiCWOiCMICPOCKSneooeneiwhusioms7AENClll:S.IACHJGHJjFAtlLTS.GOLDDEPOSE.PRINCIPALGOLD0EPOSITStNT
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
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