Crustal thickening in an active margin setting (Philippines): The whys and the hows

(整期优先)网络出版时间:2004-04-14
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Asynthesisofcrustalthicknessestimateswasmaderecentlyutilizingavailablefield,geochemical,seismicity,shearwavevelocityandgravitydatainthePhilippines.TheresultsshowthatasignificantportionofthePhilippinearchipelagoisgenerallycharacterizedbycrustwithathicknessofaround25to30kilometers.However,twozones,whicharemadeupofathickercrust(from30to65km)havealsobeendelineated.TheLuzonCentralCordilleraregionischaracterizedbythickcrust.AnotherbeltofthickenedcrustisobservedintheBicol-Negros-Panay-CentralMindanaoregion.ThispaperexaminestheinterplayoftectonicandmagmaticprocessesandtheirroleinmodifyingPhilippinearccrust.Theprocesses,whichcouldaccountfortheobservedcrustalthicknesses,arepresented.Thecontributionsofmagmaticarcsascomparedtothecontributionoftheemplacementandaccretionofophiolitecomplexestocrustalthicknessarealsodiscussed.