University of Isfahan Petrological Journal 2228-5210 7 25 2016 03 20 A study of the Eocene S-type granites of Chapedony metamorphic core complex (northeast of Yazd province, Central Iran) A study of the Eocene S-type granites of Chapedony metamorphic core complex (northeast of Yazd province, Central Iran) 33 50 20831 10.22108/ijp.2016.20831 FA Zahraalsadat Zakipour Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran Ghodrat Torabi گروه زمین شناسی دانشگاه اصفهان Journal Article 2016 11 26 The Eocene Chapedony metamorphic core complex, is located in western part of the Posht-e-Badam block. This complex is consisting of migmatite, gneiss, amphibolite, marble, micaschist and various types of granitoids. In middle part of this complex (Kalut-e-Chapedony), an Eocene granitic rock unit cross cuts the other rocks. The minerals of this granite are plagioclase (An9Ab87Or4), potassium feldspars (orthoclase), quartz, euhedral garnet (Alm77Sps13Prp9Grs1), zircon, apatite, fibrolitic sillimanite and muscovite. Petrology and geochemical studies reveal calc-alkaline, peraluminous and S-type nature of the studied granites. Chondrite-normalized REE patterns represent evident negative anomaly of Eu and low values of the REEs. Continental crust and North American shale composite (NASC) - normalized multi-elements spider diagrams indicate trace elements depletion. These granites are formed by melting of continental crust sedimentary rocks, resulted by emplacement of mantle-derived magma at the bottom of continental crust which formed the Chapedony metamorphic core complex. The source rock of these granites should be a clay-rich sedimentary rock with low amount of plagioclase and CaO/Na2O ratio. The Eocene Chapedony metamorphic core complex, is located in western part of the Posht-e-Badam block. This complex is consisting of migmatite, gneiss, amphibolite, marble, micaschist and various types of granitoids. In middle part of this complex (Kalut-e-Chapedony), an Eocene granitic rock unit cross cuts the other rocks. The minerals of this granite are plagioclase (An9Ab87Or4), potassium feldspars (orthoclase), quartz, euhedral garnet (Alm77Sps13Prp9Grs1), zircon, apatite, fibrolitic sillimanite and muscovite. Petrology and geochemical studies reveal calc-alkaline, peraluminous and S-type nature of the studied granites. Chondrite-normalized REE patterns represent evident negative anomaly of Eu and low values of the REEs. Continental crust and North American shale composite (NASC) - normalized multi-elements spider diagrams indicate trace elements depletion. These granites are formed by melting of continental crust sedimentary rocks, resulted by emplacement of mantle-derived magma at the bottom of continental crust which formed the Chapedony metamorphic core complex. The source rock of these granites should be a clay-rich sedimentary rock with low amount of plagioclase and CaO/Na2O ratio. https://ijp.ui.ac.ir/article_20831_25169f1858e4703e781fe0f1bbc8dc09.pdf