PETROGRAPHY, GEOCHEMISTRY AND TECTONIC SETTING OF ROODARE GRANITOID (SOUTH OF BIRJAND)

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MOHAMMADI S.S.

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Journal Paper

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2011 | Volume:19 | Issue:2 Page(s): 339-352

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Information Journal Paper

Title

PETROGRAPHY, GEOCHEMISTRY AND TECTONIC SETTING OF ROODARE GRANITOID (SOUTH OF BIRJAND)

Author(s)

MOHAMMADI S.S. | Issue Writer Certificate

Keywords

ROODAREQ2

BIRJANDQ2

GRANITOIDQ2

GEOCHEMISTRYQ2

TECTONIC SETTINGQ2

Abstract

ROODARE GRANITOID outcropped at contact of upper cretaceous diabas in south of BIRJAND. It is compositionally ranging from tonalite to granodiorite and granite. The main minerals are plagioclase, quartz, alkali feldspar, hornblende and biotite. Disequilibrium evidences such as oscillatory zoning, embayment of hornblende and inclusion of plagioclase in alkali feldspar are present. ROODARE GRANITOID is calc-alkaline, low to medium-K, metaluminousslightly peraluminous and I-type. Based on HFSEs depletion (e.g. Nb, Ti, P, Y, Yb and Ta), these rocks belong to subduction-related TECTONIC SETTING. These depletions can be resulted from contamination and mixing of magma with crustal constituents during ascent and replacement.The REE patterns of analysed samples are characterized by light REE-enrichment, heavy-REE depletion and small negative Eu anomalies (Eu/Eu*=0.71-0.97). Enrichment of samples in LREE and depletion in HREE imply continental margin volcanic arc metaluminous I-type magmatism. These characteristics demonstrated that magma generation occured in subducted oceanic lithosphere and metasomatized mantle wedge which followed by fractional crystallization and crustal contamination. On the tectonic discrimination diagrams, all samples fall within the volcanic arc granite field and subduction zone enrichment. ROODARE GRANITOID have Low Sr (110-261ppm), Sr/Y and plot predominantly in the field of mantle-derived arc magmas (normal calc-alkaline rocks) and hence, are different from adakites.

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References

THE EVOLUTION MECHANISM'S OF ZAHEDAN GRANITOIDIC BATHOLITH, SOUTHEAST IRAN

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APA: Copy

MOHAMMADI, S.S.. (2011). PETROGRAPHY, GEOCHEMISTRY AND TECTONIC SETTING OF ROODARE GRANITOID (SOUTH OF BIRJAND). IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 19(2), 339-352. SID. https://sid.ir/paper/4083/en

Vancouver: Copy

MOHAMMADI S.S.. PETROGRAPHY, GEOCHEMISTRY AND TECTONIC SETTING OF ROODARE GRANITOID (SOUTH OF BIRJAND). IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2011;19(2):339-352. Available from: https://sid.ir/paper/4083/en

IEEE: Copy

S.S. MOHAMMADI, “PETROGRAPHY, GEOCHEMISTRY AND TECTONIC SETTING OF ROODARE GRANITOID (SOUTH OF BIRJAND),” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 19, no. 2, pp. 339–352, 2011, [Online]. Available: https://sid.ir/paper/4083/en

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