Ahmad Ahmadikhalaji
Articles written in Journal of Earth System Science
Volume 128 Issue 3 April 2019 Article ID 0063 Research Article
Peshtasar basalts: An example of post-collision basalts in sedimentary basin of Moghan, NW Iran
Abbasali Amraee Reza Zareisahamieh Mohsen Moayyed Ahmad Ahmadikhalaji Amirmorteza Azimzadeh Jose Francisco Santos
With an east–west exposure trend, Peshtasar Complex, which is located in the sedimentary basin of Moghan, northwestern Iran, is lithologically varied. The main constituent minerals are plagioclase, clinopyroxene and iddingsitised olivine in basalts and plagioclase megacryst, clinopyroxene and leucite in tephrite. The studied rocks are plotted in the fields of basaltic trachy-andesite, trachy-andesite and tephri-phonolite in the total alkali-silica (TAS) diagram as well as high-K to calc-alkaline and shoshonite fields. The chondrite normalised pattern of rare earth elements indicates the enrichment of LILE and LREE as well as the depletion of HFSE and HREE. Nb and Ti have a negative anomaly in the spider diagram. Eu/Eu* represents a positive anomaly for Eu indicating the frequency of calcic plagioclase and low oxygen fugacity in rocks. Geochemical parameters and diagrams predict a magmatic evolution via assimilation – fractional crystallisation process. According to the Ce/Yb
Volume 130, 2021
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