مطالعه كانسار فلوگوپيت املش

Study of Amlash phlogopite deposit

Southern highland of Amlash city including ophiolitic rocks of upper cretaceous age that pillow lavas and isotropic gabbros are make its major outcrops. Mica-bearing dikes (Alkaline dikes) without specified trend and in different direction have infiltrated in nominated rocks. Based on field evidences and microscopic study of dikes, this dikes are kind of alkaline lamprophyre feldspar-bearing which 6Cm idiomorphic megacryst make almost 10 percent of them. According to Guilan province industries and mines organization (2008) two amlshʹs mica mines (Ya ali govabar & param sara) proved reserved is more than 240 thousand tones. Abounding of zoned phlogopite in alkaline dikes in different sizes according to their formation conditions (High water vapor pressure and more than 1100 °c temperature) probably dikes melt has made of molten mantle wedge in sub duction with low melt percent (at last 3 percents).