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Petrology, Geochemistry and Tectonomagmatic Settinng of Kaleybar Intrusion (Eastern Azarbaijan)

Document Type : Original Research Paper

Authors

1 PhD. Student, Tarbiat Moddares University, Faculty of Basic Sciences, Department of Geology, Tehran, Iran

2 Associate Professor, Reserch Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran.

3 Professor, Kharazmi University, Faculty of Basic Sciences, Department of Geology, Tehran, Iran.

4 Assistant Professor, Tarbiat Moddares University, Faculty of Basic Sciences, Department of Geology, Tehran, Iran.

Abstract

Nepheline syenite intrusive of Kaleybar is located in South and West of the Kaleybar city in eastern Azarbayjan province. This zoned intrusive complex is formed by penetration of two separated silica undersaturated and saturatated magmatic phases with Oligocene-Miocene ages. Undersaturated rocks are composed of alkali pyroxenite, mela alkali-gabbro to nepheline gabbro-diorte, nepheline syenite and nepheline sodalite syenite dikes. Silica saturated rocks is consist of  a quartz monzonitic stock, which has penetrated in the center of nepheline syenite intrusive and related quartz syenite - micro syenite dikes. Undersaturated phase has potassic alkaline affinity and nepheline syenites are miaskitic Malignite. In contrast, silica saturated rocks belong to high-K calc-alkaline to shoshonitic magma. Field observation, petrographical and geochemical studies, indicates that undersaturated rocks are comagmatic and crystal fractionation, accumulation and low density minerals floatation processes play significant role in their magmatic evolution. High enrichment of rare elements especially LREE and LILE compare to variable depletion of HREE and HFSE are infer a basanitic parental magma generated from a previously subduction-metasomatised lithospheric mantle source. Silica saturated magma of Kaleybar was probably resulted form the lower crust Partial melting and geochemical similarities resulted from partial melting of lower crust and its geochemical similarities with undersaturated parts is due to magma mixing and contamination. Repeatedly injection of alkaline and calc-alkaline magmas could be occurred in a post collision setting after Eocene in Azerbaijan region.

Keywords

References
 
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Scientific Quarterly Journal of Geosciences
Volume 22, Issue 85
December 2013
Pages 205-224
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