Abstract
The Zouzan pluton is one of the intrusive bodies in the NE of Lut block enclosed by Cenozoic volcanic and sedimentary rocks. It consists of two distinct mafic and felsic magmas which are genetically unrelated. All studied rocks are calc-alkaline in nature, with LILE/REE and HFSE/REE ratios compatible with arc related magmatism. Mafic phase has dioritic composition emplaced as small stocks in felsic rocks. Geochemical characteristics in dioritic rocks (relatively high contents of incompatible elements, low Na2O and Mg#>44) suggest they were derived from partial melting of metabasalt sources in a subduction settings. Felsic phase composed of granodiorite to granite rocks with high-K calcalkaline metaluminous to slightly peraluminous signature. Major and trace element data exclude high pressure melting and metasedimentary parental in the formation of Zouzan felsic rocks. They have been formed by partial melting of mantle-derived mafic rocks. Field relation, petrographical evidences and chemical composition show that partial melting of a mantle wedge in conjunction with magma mixing and crystal fractionation would have led to generation of Zouzan pluton.
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