Abdorazagh Jabbari; Mansoor Ghorbani; Juergen Koepke; Ghodrat Torabi; Nargess Shirdashtzadeh
Volume 1, Issue 2 , September 2010, , Pages 17-30
Abstract
In Borooni area (SW of Ardestan), which is a part of Uromiyeh â Dokhtar magmatic belt, the Miocene basaltic columnar-jointed dikes cross cut the Eocene volcanic rocks. These ...
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In Borooni area (SW of Ardestan), which is a part of Uromiyeh â Dokhtar magmatic belt, the Miocene basaltic columnar-jointed dikes cross cut the Eocene volcanic rocks. These rocks contain the granitoid enclaves of Oligocene age and possibly, they are Miocene in age. The studied rocks are composed of chloritized olivine, clinopyroxene, plagioclase, chlorite, ilmenite and magnetite. Textures of these rocks are porphyritic, microlitic, microlitic porphyritic, glomerophyric, and sieved texture of plagioclases. Clinopyroxenes are augite to diopside in composition, and plagioclases range from labradorite to bytownite. Chlorites show diabantite composition and most of them produced by olivine alteration. Some chlorites are present in groundmass. Petrography and chemistry of minerals show that the parent magma subjected to a magma mixing with xenoliths of granitoid rocks during the ascending. These rocks are similar to the volcanic arc basalts.
