Title: Geochemistry and Petrogenesis of Plutonic Bodies in Tazeh Shahr (NW of Orumieh Lake)
Abstract:The study area is located in the northwest of Sal mas district in western Azarbayjan province. This region forms a part of Mesozoic-Ther tiary plutonic belt in sanandaj-sirj an zone. The plutonic rock...The study area is located in the northwest of Sal mas district in western Azarbayjan province. This region forms a part of Mesozoic-Ther tiary plutonic belt in sanandaj-sirj an zone. The plutonic rocks have been intruded into the Precambrian metamorphic complex with metamorphic grade ranges from green schist Facies to Amphibolite. Based on fie ld, petrographic and geochemicaly studies these plutons contain intermediate-basic and acidic spectrums. Contact of intermediate-basic Plutons with Metamorphic marbles has been caused Skarnization. The rocks texture widely varies from granular to granoporphyry. Based on results of modal analysis the intermediate-basic plutons are composed of Diorite, Quartzdiorite, Monzodiorite, Quartzmonzodiorite, Monzonite and Gabrodiorite. Furthermore, these plutons consist of Plagioclase, Hornblend and pyrexon (Augite) minerals. The acidic rocks composed of Quartz and Feldspar (Plagioclase and Alkalifeldspar) ranging from Granite to Granodiorite. Mafic magmatic enclaves or Mafic microgranolar enclaves (MME) occur in the interior part of plutons with different dimensions. These enclaves have fine texture and more mafic minerals. From the geochemical viewpoint, intermediate-basic rocks show tholeitic nature while acidic rocks have Calc-Alkaline nature. Also, the Alumina saturation index indicates that rocks have the metalominouse nature. In addition, their are Calcic, Magnesian, Cordilleran I-Type characteristics. Their geodynamical quantities closely resemble Batholith 0f Peru plutons of type VAG. geochemical data indicate that intermediate-Basic plutons originate from evolutionary lithospheric mantle while acidic plutons have been produced by fraction melting of crust rocks.Read More
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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