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Biến đổi vi cấu trúc và thành phần của allanite trong các mạch thủy nhiệt: Ý nghĩa đối với sự di động của các nguyên tố đất hiếm tại khu phức hợp đá granit gneiss Chhotanagpur, huyện Purulia, bang West Bengal, Ấn Độ
Tóm tắt
Nghiên cứu này sử dụng sự kết hợp giữa cấu trúc và thành phần của allanite để điều tra sự phát triển hóa học của các nguyên tố đất hiếm (REEs) trong các mạch thủy nhiệt thuộc khu phức hợp đá granit gneiss Chhotanagpur quanh khu vực Kalapathar, huyện Purulia, bang West Bengal, Ấn Độ. Allanite xuất hiện dưới dạng túi và khối trong các mạch thủy nhiệt. Tại địa phương, các túi/khối allanite có nồng độ cao các nguyên tố đất hiếm (∑REEs ~9,8 wt.%), Th (tối đa 1427,2 ppm) và U (tối đa 642,1 ppm). Ba loại dung dịch thủy nhiệt và sự di động của REE liên quan đã được phân biệt và đặc trưng. Dung dịch thủy nhiệt1 gây ra sự bổ sung metasomatic của REEs dẫn đến sự hình thành allanite giàu REE sớm. Dung dịch thủy nhiệt2 thúc đẩy thay đổi về cấu trúc và thành phần của allanite, trong đó allanite sớm đã bị thay thế bởi allanite tương đối thiếu REE theo sơ đồ thay thế REE+3 + (Fe+2, Mg+2) → Ca+2 + (Al, Fe+3). Dung dịch thủy nhiệt3 được đánh dấu bởi sự chuyển đổi allanite thành bastnaesite và monazite. REEs chủ yếu được vận chuyển trong các phức chlo có nước với độ muối từ cao đến trung bình và nhiệt độ đồng nhất thấp (257°–361°C). Thời gian của sự kiện thủy nhiệt được xác định thông qua phương pháp định tuổi U–Th–tổng Pb đối với monazite, cho giá trị khoảng 875 ± 43 Ma.
Từ khóa
#allanite #nguyên tố đất hiếm #mạch thủy nhiệt #Chhotanagpur #West BengalTài liệu tham khảo
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