PETROLOGY, GEOCHEMISTRY AND TECTONOMAGMATISM OF GRANITOIDIC ROCKS OF TAKNAR COMPLEX, IRAN

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RAHMANI H.; POURMOAFI M.; GHORBANI M.; MASOUDI F.; SOLTANI A.

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Journal: Iranian Journal of Geology Year:2012 | Volume:6 | Issue:23 Page(s): 3-17

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Title

PETROLOGY, GEOCHEMISTRY AND TECTONOMAGMATISM OF GRANITOIDIC ROCKS OF TAKNAR COMPLEX, IRAN

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Keywords

GRANITOIDQ2

I-TYPEQ2

INCOMPATIBLE ELEMENTSQ2

VOLCANIC ARCQ2

NEOTETHYSQ2

Abstract

Taknar complex which is situated at the Taknar structural zone is in northern part of Central Iranian microcontinent. The position of this assemblage is at the 20Km of northwestern of Bardaskan County. Taknar complex with Late Jurassic–Early Cretaceous is the result of extensive magmatism in northern part of Central Iranian microcontinent which is caused by Middle Cimmerian to Late Cimmerian orogenic events. This complex are an assemblage of leucogranite, granite, granodiorite, tonalite and granophyre. The mail texture of these rocks is granular and also we can see porphyroid, pertitic and granophyric textures. The major constitutive minerals of these granitic rocks are orthoclas and microcline with pertitic texture and amorphic quartz. The granodioritic and tonalitic rocks of this assemblage have dark color due to frequent existence of biotite. The granophyre rocks of this assemblage are small apophysis in the old rocks.The magmatic series of rocks in the rocks of this complex are calcalkaline. The chemical characteristics and tectonic environment of the studied GRANITOIDics of the complex are completely similar to each other. From the alomine saturation point of view, the samples are in the range of meta-alomine to per-alomine. In addition to petrographic characteristics, the I-TYPE granites are comparable with the mentioned GRANITOIDics in their geochemical features. These are Medium-K rocks and also enriched in the LILE such as Rb, Cs and Th while depleted in the Nb and Ti. Therefore, it shows that these rocks resulted from the mixing by the lower crust. The comparison of the major and trace elements within these rocks indicates their orogenic tectonic environment. The rocks of this complex are formed at the continental margin and (VAG) environment which it is related to the subduction of the NEOTETHYS oceanic crust under Central Iranian Microcontinent.

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APA: Copy

RAHMANI, H., POURMOAFI, M., GHORBANI, M., MASOUDI, F., & SOLTANI, A.. (2012). PETROLOGY, GEOCHEMISTRY AND TECTONOMAGMATISM OF GRANITOIDIC ROCKS OF TAKNAR COMPLEX, IRAN. IRANIAN JOURNAL OF GEOLOGY, 6(23), 3-17. SID. https://sid.ir/paper/129499/en

Vancouver: Copy

RAHMANI H., POURMOAFI M., GHORBANI M., MASOUDI F., SOLTANI A.. PETROLOGY, GEOCHEMISTRY AND TECTONOMAGMATISM OF GRANITOIDIC ROCKS OF TAKNAR COMPLEX, IRAN. IRANIAN JOURNAL OF GEOLOGY[Internet]. 2012;6(23):3-17. Available from: https://sid.ir/paper/129499/en

IEEE: Copy

H. RAHMANI, M. POURMOAFI, M. GHORBANI, F. MASOUDI, and A. SOLTANI, “PETROLOGY, GEOCHEMISTRY AND TECTONOMAGMATISM OF GRANITOIDIC ROCKS OF TAKNAR COMPLEX, IRAN,” IRANIAN JOURNAL OF GEOLOGY, vol. 6, no. 23, pp. 3–17, 2012, [Online]. Available: https://sid.ir/paper/129499/en

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