Hoạt động thoát khí CO2 trong vỏ trái đất ở những khu vực va chạm kiến tạo: Nghiên cứu trường hợp từ các khu vực Pollino và Calabria (Nam Ý)
Tóm tắt
Carbon dioxide (CO2) được phát thải từ nội tâm của Trái Đất vào bầu khí quyển thông qua cả nguồn núi lửa và phi núi lửa trong nhiều bối cảnh kiến tạo khác nhau. Việc hiểu biết định lượng về lưu lượng thoát khí CO2 ở các bối cảnh địa chất khác nhau là rất quan trọng để giải mã mối liên hệ giữa ngân sách carbon toàn cầu và các quá trình tự nhiên khác nhau (ví dụ, sự phun trào núi lửa và sự hình thành động đất) cũng như tác động của chúng đến sự phát triển khí hậu qua các thời đại địa chất. Gần đây, người ta đã đề xuất rằng sự thoát khí CO2 từ những khu vực phi núi lửa là một thành phần chính trong ngân sách phát thải CO2 tự nhiên, nhưng dữ liệu hiện có vẫn còn thưa thớt và chưa đầy đủ. Tại đây, chúng tôi báo cáo kết quả của một cuộc khảo sát địa hóa nhằm định lượng lượng phát thải CO2 qua các suối nước nóng và lạnh ở khối Pollino và vòng cung Calabria (Nam Ý), nơi có hoạt động kiến tạo. Thành phần hóa học và đồng vị (He và C) của năm mươi lăm mẫu khí hòa tan cho phép xác định hai miền khác nhau: 1) một hệ thống nông có sự chiếm ưu thế của các thành phần khí có đặc trưng khí quyển (helium, sau đây là He) và nguồn gốc sinh học (C), và 2) một hệ thống sâu hơn là nơi mà các chất lỏng trong vỏ/trong sâu (CO2 và He) chiếm ưu thế. Tỷ lệ đồng vị He đo được dao động từ 0.03 đến 1.1 Ra (trong đó Ra là tỷ lệ đồng vị He trong khí quyển) cho thấy sự ô nhiễm khí quyển thay đổi. Hơn nữa, dữ liệu đồng vị He chỉ ra sự hiện diện của dấu vết đóng góp của He từ manti (2%–3%) trong nước ngầm nhiệt. Các giá trị R/Ra thấp chiếm ưu thế phản ánh sự bổ sung He đồng vị phóng xạ 4He trong quá trình tuần hoàn nước ngầm. Sử dụng dữ liệu đồng vị helium và carbon, chúng tôi khám phá các nguồn có thể của chất lỏng và các quá trình thứ cấp (hoà tan/ kết tủa) tác động đến việc thay đổi hóa học của các chất dễ bay hơi tinh khiết. Đối với các suối nước nóng, chúng tôi ước tính sản lượng C sâu là 2.3 x 107 đến 6.1 x 108 mol năm−1. Những giá trị này tương ứng với các lưu lượng CO2 sâu theo km vuông tương đương với những giá trị được ước tính trong một số khu vực núi lửa đang hoạt động và không hoạt động, cũng như trong các vùng lục địa bị ảnh hưởng bởi sự thoát khí CO2 biến chất (ví dụ, rìa phía nam của Cao nguyên Tây Tạng).
Từ khóa
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