Sự hình thành của các megacryst K-feldspar trong các pluton granodiorite qua chu trình nhiệt và làm thô kết cấu giai đoạn muộn

Springer Science and Business Media LLC - Tập 159 - Trang 599-619 - 2009
Breck R. Johnson1,2, Allen F. Glazner1
1Department of Geological Sciences, University of North Carolina, Chapel Hill, USA
2Anadarko Petroleum Corporation, The Woodlands, USA

Tóm tắt

Các megacryst K-feldspar trong các pluton granite và granodiorite thường được suy diễn là những giai đoạn tinh thể hóa sớm (phát triển đến kích thước lớn khi magma chủ yếu ở trạng thái lỏng) nhờ vào kích thước lớn, hình dạng euhedral và các đặc điểm gợi ý về sự lắng đọng thông qua sự lắng đọng magmatik. Tuy nhiên, các thí nghiệm về cân bằng pha và các ví dụ tự nhiên về sự kết tinh và nóng chảy một phần cho thấy K-feldspar là một trong những pha cuối cùng nối kết tinh thể và rằng hầu hết sự phát triển tinh thể phải xảy ra sau khi magma vượt quá 50% tinh thể hóa và do đó chủ yếu không thể lưu động và lắng đọng. Phân bố kích thước của megacryst, thành phần và các mối quan hệ cấu trúc từ Cretaceous Tuolumne Intrusive Suite, California, cho thấy rằng sự chuyển đổi dần từ granodiorite đồng hạt sang megacrystic khả năng xảy ra thông qua sự làm thô cấu trúc do chu trình nhiệt. Các nghiên cứu thực nghiệm và lý thuyết cho thấy rằng nhiệt độ tăng lên gây ra sự nóng chảy tương đối nhiều hơn ở các tinh thể nhỏ so với các tinh thể lớn, trong khi tốc độ phát triển tuyến tính trong quá trình làm lạnh là tương tự. Do đó, trong quá trình nóng chảy nhiệt, chất liệu được chuyển từ các tinh thể nhỏ sang các tinh thể lớn hơn. Sự phát triển của megacryst qua chu trình nhiệt trong quá trình đặt dần là nhất quán với sự điểm cần thiết phát triển muộn của K-feldspar, giải thích sự hiện diện của các megacryst trong các phần bên trong của Tuolumne Intrusive Suite và những nơi khác, và có thể là một quá trình phổ biến trong sự hình thành của các đá granit megacrystic.

Từ khóa

#K-feldspar #megacryst #granodiorite #chu trình nhiệt #sự kết cấu #tinh thể hóa

Tài liệu tham khảo

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