The Malayer plutonic complex: field geology, petrography and geochemical interpretation

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Yeganehfar hadi; AHADNEJAD VAHID; DEEVSALAR REZA

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2019 | Volume:27 | Issue:3 Page(s): 577-596

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Title

The Malayer plutonic complex: field geology, petrography and geochemical interpretation

Author(s)

Yeganehfar hadi | AHADNEJAD VAHID | DEEVSALAR REZA | Issue Writer Certificate

Keywords

Malayer plutonic rocksQ1

magma mixingQ2

magmatic fractionationQ1

partial meltigQ2

Abstract

The geochemical signatures like discordant variation of major and trace elements among felsic-intermediate and basic rocks and mafic enclaves of Malayer region on binary variation plots, decreasing values of FeOt, TiO2, MgO, MnO and CaO accompanied with increasing of SiO2 content from basic to felsic rocks, and decreasing Ni, Cr and Co with increasing SiO2 are considered as indications of magma mixing/mingling event in the petrogenesis of high potassium calk-alkaline granitic rocks of the Malayer region. Felsic and basic rocks of Malayer pluton show different REE pattern (LREEs/HREEs), where Eu-anomalies values such as LaN/SmN content as an index for concentration of LREEs and GdN/YbN content as an index for the concentration of HREEs are different. The relative enrichment in LILEs (e. g. U, Th, Ba, Rb, Cs, K) than HFSEs (Y, Yb, Zr, Ti, Tb, etc), constant variation of compatible elements (such as V, Ni, and Cr) in the differentiated phases, and negative anomaly of Nb and Ta can be attributed to the role of the components from the subducted oceanic plate as long as crustal components in the formation of granitic magma. The results show that magmatic differentiation associated with crustal contamination and partial mixing (or mingling) is responsible for the formation of granitic and dioritic intrusions, while magmatic enclaves are generated by magma mixing process. Negative Eu-anomaly in the felsic-intermediate rocks with respect to their concordant REEs variations suggests plagioclase fractionation plays role in their petrogenesis. The non-concordant REEs variations and less enriched LREEs in basic rocks are consistent with partial melting process of an ultrabasic source. The heat transfer and further crustal anatexis may lead to extensive granitization. The mixing of basic magma and anatectic melts is suggested as being responsible for the generation of microgranular mafic enclaves and basic dykes.

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APA: Copy

AHADNEJAD, VAHID, DEEVSALAR, REZA, & Yeganehfar, hadi. (2019). The Malayer plutonic complex: field geology, petrography and geochemical interpretation. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 27(3 ), 577-596. SID. https://sid.ir/paper/3959/en

Vancouver: Copy

AHADNEJAD VAHID, DEEVSALAR REZA, Yeganehfar hadi. The Malayer plutonic complex: field geology, petrography and geochemical interpretation. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2019;27(3 ):577-596. Available from: https://sid.ir/paper/3959/en

IEEE: Copy

VAHID AHADNEJAD, REZA DEEVSALAR, and hadi Yeganehfar, “The Malayer plutonic complex: field geology, petrography and geochemical interpretation,” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 27, no. 3 , pp. 577–596, 2019, [Online]. Available: https://sid.ir/paper/3959/en

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