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Đặc điểm địa chất của lớp manti vỏ trái đất dưới khu vực Nui Nua và Ba Ria, miền Nam Việt Nam
Tóm tắt
Các mẫu spinel peridotite từ các nhóm núi lửa Nui Nua và Ba Ria ở miền Nam Việt Nam đã được nghiên cứu nhằm giải đoán các quá trình trong manti và sự tiến hóa hóa học của lớp manti thạch quyển bên dưới miền Nam Việt Nam. Spinel peridotite từ cả hai khu vực nghiên cứu bao gồm lherzolite và harzburgite với các kết cấu porphyroclastic. Các mẫu spinel peridotite có thể đã trải qua quá trình nóng chảy phân đoạn với mức độ thấp (1–13%). Sự biến đổi của các nguyên tố đất hiếm nhẹ (LREEs) và các nguyên tố không tương thích khác trong clinopyroxene cho thấy hầu hết các mẫu spinel peridotite đã trải qua quá trình biến chất silicat. Các xenolith spinel peridotite của cả hai khu vực có nguồn gốc từ độ sâu nằm giữa 35 và 52 km với nhiệt độ cân bằng dao động từ 714–1211 °C (±15 °C). Sự tương quan giữa các thành phần đồng vị Sr, Nd và Pb của clinopyroxene cho thấy rằng các mẫu spinel peridotite có nguồn gốc từ sự trộn lẫn giữa các nguồn manti bị suy thoái (DM) và các nguồn manti phong phú (EM2). Các mẫu spinel peridotite từ Nui Nua đưa ra tuổi isohron Pb-Pb là 3.6 ± 0.3 Ga, cho thấy thời điểm hình thành lớp manti thạch quyển dưới miền Nam Việt Nam do quá trình trích xuất nhiệt độ ban đầu.
Từ khóa
#spinel peridotite #lherzolite #harzburgite #quá trình biến chất #đồng vị #lớp manti thạch quyển #miền Nam Việt NamTài liệu tham khảo
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