مطالعات پترولوژی و زمین شناسی سنگهای سیل مختلط در شمال روستای چهرگان (غرب تسوج – آذربایجان شرقی)

Petrological and Geological Studies of Complex Sill in north of cheheregan Village

(West of Tasuj, East Azerbaidjan)

Abstract :

Complex sill intrusion of Gatheroochan mount situated at north of chehregan village, north of urmia lake that extend for ۴ kilometer with ۴۰۰m width. This sill contains mafic rock include of Gabbro, Dolerite and diabase and felsic rocks include Rhyolite and qranophyre. Parental magmas of these rocks is mafic magmas that differentiated due to different density, temperature into the different density, temperature into the different acidic and mafic immisible melts. This differentiation process caused to formation of basic rock and acidic rocks such as granophyre and Rhyolite. In the intrusion acidic rocks occur at upper part and mafic rocks occur at lower part of intrusion. Acidic rocks Characterize with prophyritic texture and mafic rocks with ophitic to subophitic texture. Geochemical data and discrimination diagrams, Suggest within continental Plate magma. Emplcement and display tholoeitic magmatic character. Age of this intrusion according to field data is pre – Permian.