Farimah Ayati; Hashem Bagheri; Hooshang Asadi Harooni; Mahmoud Khalili; Salimeh sadat Komeili
Volume 5, Issue 19 , December 2014, , Pages 1-20
Abstract
The study area is located in the Uromieh-Dokhtar volcanic belt and composed of andesite-basalt, andesite, dacite and quartz-monzonite as volcanic and subvolcanic. The occurrence of ...
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The study area is located in the Uromieh-Dokhtar volcanic belt and composed of andesite-basalt, andesite, dacite and quartz-monzonite as volcanic and subvolcanic. The occurrence of phyllic, argillic and propyllitic alterations point to the presense of hydrothermal fluids. The studied amphiboles have tschermakite and ferro-edenite composition. The compositional changes from core (Fe-Mg-Mn) to rim (calcic) refer to the variation of physico-chemical condition of magma in the last stage of crystallization. The biotites are assumed to be primary, their Fe/Fe+Mg ratio is over than 0.33% and they are iron enriched. The composition of the chlorites plotted in the repidolite field with Fe and Si in the range of 6.56% to 6.76% and 5.19% to 5.61% respectively. The low content of Al+Fe3+ in sphene, can be the result of high temperature of its formation. The potassium content of the Kahang jarosites is more than that of the sodium indicating the hydrothermal-magmatic condition of these phases formation.
