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Manuscript ID : 542439 Visit : 134 Page: 68 - 77

Article Type: Original Research

Geochemical evolution and petrogenesis of the eocene Kashmar granitoid rocks, NE Iran: implications for fractional crystallization and crustal contamination processes

Subject Areas : Mineralogy

Rahim Dabiri 1 , Mohsen Akbari-Mogaddam 2 , Mitra Ghaffari 3

1 - Department of Geology, Faculty of Science, Islamic Azad University, Mashhad, Iran
2 - Geological Survey of Iran, North- East Territory, Mashhad, Iran
3 - Department of Geology, Tarbiat Modares University, Tehran, 14115–175, Iran

Received: 2018-08-10 Accepted : 2018-08-10 Published : 2018-04-01

Keywords: Contamination, Geochemical Modeling, Petrogenesis, Granitoids, Taknar Zone,

Abstract :

Kashmar granitoids of Taknar zone, in north part of Lut block, intruded into volcanic rocks and consist of granites, granodiorites, monzodiorite and gabbrodiorites. They are composed of mainly plagioclase, alkali-feldspar, quartz, amphibole, biotite and pyroxene minerals. Harker diagram variation, including negative correlations CaO, MgO, FeO, TiO2 and V and positive correlations K2O, Rb, Ba, and Th, with increasing SiO2 and chondrite-normalized REE patterns, suggest that fractional crystallization of gabbrodioritic rocks could have played a significant role in the formation of granites. Their chondrite-normalized REE patterns are characterized by LREE enrichment and show slight negative Eu anomalies. Chondrite-normalized REE modelling indicates that the magma of Kashmar gabbrodiorites were generated with 3–5% of partial melting of a a spinel-lherzolite source. Melting of parental magma located at ~53 km.

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