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Title

PETROLOGY AND PETROGENESIS OF MAFIC IGNEOUS ROCKS IN MASHIRAN, NORTH OF MESHKINSHAHR

Pages

  201-212

Abstract

 The study area is located in the Ardabil province and in the north of Meshkin shahr town. A large part of the areais formed of Eocene igneous rocks. These rocks include basaltic andesite, basalt, tephriteand occasionally ANALCIMITE. They are silica saturated or relatively saturated. According to tectonomagmatic diagrams, the original setting of the parental magma wasa volcanic arc and subduction zone. The negative anomalies of Nb, the high ratio of LILE/HFSE, the high mounts of Al2O3 & P2O5, the low titanium contents, and the degree of PARTIAL MELTING of the metasomatized upper mantle, strengthens the subduction related processes for the formation of the primary magma (alkali olivine basalt). Petrographic evidences suggest that the primary magma is mixed with crustal materials. The chemical composition of rocks, according to geochemical diagrams, is shoshonitic. These rocks may have been formed by the subduction of the oceanic crust of Neoteties during the Mesozoic and early Cenozoic periods. Releasing fluids exerted from the subducting slab, METASOMATISM of the lithospheric mantle and subsequently the appropriate conditions for melting of the metasomatized mantle, all led to the formation of potasic magmatism and finally, generation of magma with a shoshonitic nature found its way to the surface under the influence of an extension phase and complex fault systems.

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    APA: Copy

    POOSTI, M., & FADAEIAN, M.. (2015). PETROLOGY AND PETROGENESIS OF MAFIC IGNEOUS ROCKS IN MASHIRAN, NORTH OF MESHKINSHAHR. GEOSCIENCES, 24(96), 201-212. SID. https://sid.ir/paper/32483/en

    Vancouver: Copy

    POOSTI M., FADAEIAN M.. PETROLOGY AND PETROGENESIS OF MAFIC IGNEOUS ROCKS IN MASHIRAN, NORTH OF MESHKINSHAHR. GEOSCIENCES[Internet]. 2015;24(96):201-212. Available from: https://sid.ir/paper/32483/en

    IEEE: Copy

    M. POOSTI, and M. FADAEIAN, “PETROLOGY AND PETROGENESIS OF MAFIC IGNEOUS ROCKS IN MASHIRAN, NORTH OF MESHKINSHAHR,” GEOSCIENCES, vol. 24, no. 96, pp. 201–212, 2015, [Online]. Available: https://sid.ir/paper/32483/en

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