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Hóa học địa chất của Biotit trong các Pegmatit của thung lũng Kudi, khu vực Paddar, huyện Kishtwar, Jammu và Kashmir
Tóm tắt
Các pegmatit trong thung lũng Kudi, khu vực Paddar được phân loại khoáng vật học với sự có mặt của Na-plagioclase, thạch anh, perthite, tourmaline, biotit và một lượng nhỏ muscovite, sillimanite và garnet. Khoáng vật biotit từ các pegmatit cho thấy nồng độ cao của Al2O3, FeO, K2O, nồng độ SiO2, MgO, Cr2O3, TiO2, F ở mức độ trung bình; và nồng độ thấp của Na2O, CaO, MnO, Cl. Chúng được phân loại là loại siderophyllite. Chữ ký địa hóa của biotit cho thấy tính chất peraluminous của dung nham pegmatit được hình thành từ quá trình nóng chảy của vỏ lục địa trong bối cảnh va chạm kiến tạo. Chúng chủ yếu mang nguồn gốc magmatic; tuy nhiên, một số trong số chúng cũng cho thấy tính chất tái cân bằng. Biotit kết tinh ở nhiệt độ cao (600°C–700°C) ở áp suất ôxy thấp. 3Mg↔2Al và sự thay thế kết hợp giữa LiIV+SiIV=(Fe2+)IV đã đóng vai trò quan trọng trong quá trình kết tinh của biotit được nghiên cứu.
Từ khóa
#biotit #pegmatit #hóa học địa chất #thung lũng Kudi #huyện Kishtwar #Jammu và KashmirTài liệu tham khảo
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