Nội dung được dịch bởi AI, chỉ mang tính chất tham khảo
Đặc điểm địa hóa, tuổi địa chất và thành phần đồng vị Hf của felxit porphiri tại khu vực quặng urani Xiangshan và ý nghĩa địa chất của nó
Tóm tắt
Gần đây, một loại đá núi lửa mới, felxit porphiri, đã được phát hiện qua khoan thăm dò tại khu vực Xiangshan, tỉnh Giang Tây, Trung Quốc. Để hiểu rõ hơn về quá trình hình thành đá và chuỗi tiến hóa magma của phức hợp núi lửa-xâm nhập Xiangshan, chúng tôi đã tiến hành nghiên cứu địa chất hệ thống, địa hóa học, và xác định tuổi U–Pb bằng phương pháp LA-ICP-MS trên zircon, cũng như kết quả đồng vị Hf của felxit porphiri. Kết quả cho thấy, felxit porphiri có đặc điểm địa hóa học tương tự như rhyolite porphiroclastic, loại đá chủ yếu của khu vực quặng urani Xiangshan. Felxit porphiri và rhyolite porphiroclastic có hàm lượng SiO2, Al2O3, và K2O cao, trong khi đó hàm lượng Na2O và MgO thấp, và có sự bất thường Eu nhẹ âm. Hơn nữa, các đá này có sự suy giảm tương đối về các nguyên tố ái lực ion lớn (K, Ba, và Sr) và có sự giàu có về các nguyên tố sức mạnh trường cao (Th, Zr, và Hf). Xác định tuổi U–Pb trên zircon của felxit porphiri cho thấy tuổi kết tinh là 132.2 ± 0.9 triệu năm, tương đồng với tuổi của rhyolite porphiroclastic. Các tuổi này chỉ ra rằng phức hợp núi lửa-xâm nhập Xiangshan hình thành trong kỳ Early Cretaceous, thời kỳ mà toàn bộ Nam Trung Quốc đang ở trong môi trường kiến tạo kéo giãn hậu cung liên quan đến sự chìm lún của bản kiến tạo Thái Bình Dương dưới bản kiến tạo Á-Âu. Dữ liệu đồng vị Hf zircon tại chỗ trên mẫu felxit porphiri cho thấy giá trị εHf(t) từ −8.82 đến −5.11, trong khi tuổi mô hình hai giai đoạn đồng vị Hf (TDM2-Hf) dao động từ 1513 đến 1747 triệu năm. Kết hợp với các kết quả về petrology, khoáng vật học, địa hóa học và địa chất học của felxit porphiri, kết luận rằng felxit porphiri tại Xiangshan có thể xuất phát từ sự nóng chảy một phần của các đá biến chất cổ Mesoproterozoic, với khả năng có sự nhập vào của một lượng nhỏ vật liệu từ manti.
Từ khóa
#felxit porphiri #núi lửa #địa hóa học #đồng vị Hf #tuổi địa chấtTài liệu tham khảo
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