Mineralogy, Geochemistry and Geotectonic of Plagiogranites from Shahre-Babak Ophiolite, Zagros Zone, Iran-中国期刊网

摘要 Shahre-BabakophioliteisapartoftheinnerZagrosophiolitebeltinIran.MajorpartsofintrusivemassesofShare-Babakophiolitearegabbroandplagiogranite.TheSiO2versusNa2O+K2Odiagramshowsthatthepalgiogranitesarerelatedtocalk-alkalineseries.Rareearthelementsexhibitrelativelysimilarpatternthatindicatestheserocksaresyngenetic.Also,REEpatternsdisplayanenrichmentofLREEcomparedtoHREE,andarecharacterizedbyflattoslightlyconcaveuppatternsfromGdtoYb.Suchpatternscontrastsharplywiththoseofplagiogranitesinmorecompleteophiolitesequences,suchastheSemailophiolite,Oman,ortheTroodosophiolite,Cyprus,andNeyriz,wherepatternsaremuchflatterandslightlyLREE-depleted.TheslightlyLREE-enrichedpatternsoftheShahre-Babakplagiogranitessupportapartialmeltingoriginforthem.ThelowTiO2,Nb,TacontentandhighLREEconcentrationsoftheShahre-Babakplagiogranitesindicatethattherockswerelikelyderivedfromtheanatexisofamphibolites,whichwererelatedtohydrothermalalterationofgabbrosinintra-oceanicback-arcbasin.

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Mineralogy, Geochemistry and Geotectonic of Plagiogranites from Shahre-Babak Ophiolite, Zagros Zone, Iran

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Mineralogy, Geochemistry and Geotectonic of Plagiogranites from Shahre-Babak Ophiolite, Zagros Zone, Iran

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