简介：Wepresentnewgeochemicaldatafortheuppermantleandcrustalsections(whole-rockmajorandtraceelementcompositions)aswellasmineralchemicaldata,fromtheNorthernCarbibbeanophiolitesintheHabana-MatanzasregioninWesternCuba.TheseophiolitesarepartoftheNorthernCubanOphioliticBelt(NCOB),extendingformorethan1000kmalongtheisland.Theuppermantleperidotitesarecomposedmainlyofrefractoryharzburgitewithtectonitetextures,andshowconvex-downwardpatternsdepletedinMREEnormalizedtochondritevalues(McDonoughandSun,1995).Thesegeochemicaltrendsarecharacteristicfordepletedmantlewedgeperidotitesmetasomatizedbyslab-derived,LREEenrichedmelts.TheNCOBalsoincludesabyssalperidotiteshavinglowerLREE/HREEratiosanddisplayingrelativelyhomogeneousandflatpatternsfromMREEtoHREE.Theseperidotitesrepresentfragmentsaccretedintothecontinentalmarginfromasubductedoceaniclithosphere.GabbroanddoleriteunitsintheNCOBaresystematicallydepletedinHighFieldStrengthElements(HFSE:Nb,Ta,Hf,Ti)andREEwithrespecttoN-MORB(<1XN-MORB).Theirmeltevolutionwasaffectedbysubductioninput.Spatiallyassociatedgraniticrockshaveavolcanicarcgeochemicalaffinity.SomemaficextrusiverockswithintheNCOBexhibitboniniticsignatures,andmayrepresenttheproductsofsubductioninitiationmagmatism,whereasotherextrusiverockoccurrencesdisplayN-MORBtoE-MORBgeochemicalfingerprints,slightlymodifiedbysubductionderivedfluids.Usingthesegeochemicaldataandconstraints,wepresentatectonomagmaticmodelfortheevolutionoftheNCOBwithintheframeworkoftheCaribbeangeology.