Quy mô tương tác giữa pluton và đá vách gần hồ May, Công viên Quốc gia Yosemite, California, Hoa Kỳ

Springer Science and Business Media LLC - Tập 158 - Trang 263-281 - 2009
Ryan D. Mills1, Allen F. Glazner1, Drew S. Coleman1
1University of North Carolina at Chapel Hill, Chapel Hill, USA

Tóm tắt

Sự tương tác giữa magma với đá vách là một quá trình quan trọng trong địa chất học xâm nhập, nhưng các cơ chế diễn ra tương tác này vẫn chưa được hiểu rõ. Granodiorite ngoại vi phía tây của Khối xâm nhập Tuolumne thuộc kỷ Creta ở Công viên Quốc gia Yosemite, California, đã xâm nhập vào một loạt các đá biến chất và đá xâm nhập vào khoảng 93.1 triệu năm trước. Màng biến chất May Lake là một phần còn lại của đá biến chất, vùng tiếp xúc của nó thể hiện nhiều hiện tượng tương tác bao gồm sự tích hợp xenolith, phân tán và nóng chảy một phần. Sự tương phản hóa học của các loại đá biến chất này với pluton xâm nhập cung cấp thang đo tuyệt vời về tương tác giữa pluton và đá vách. Các xenolith đá vách (chủ yếu là quartzite pelitic) chủ yếu được tìm thấy trong một chân trời kéo dài bao quanh bởi granodiorite mịn đã được lai ghép. Tỷ lệ đồng vị Sr và Nd ban đầu của granodiorite đã lai ghép cho thấy sự kết hợp cục bộ đáng kể của vật liệu thạch quyển. Dữ liệu hóa học về nguyên tố chính và nguyên tố vi lượng cho thấy rằng sự ô nhiễm của granodiorite xảy ra thông qua sự hấp thụ có chọn lọc cả những dòng chảy nóng chảy một phần có hàm lượng kali cao và thấp, giàu silica từ quartzite pelitic. Mặc dù granodiorite đã lai ghép cho thấy lượng ô nhiễm đáng kể, nhưng quanh các xenolith, tỷ lệ ô nhiễm không thể phát hiện được hơn một mét. Những kết quả này cho thấy rằng sự biến đổi hóa học và đồng vị của Khối xâm nhập Tuolumne không phải do sự ô nhiễm magma thông qua sự hấp thụ đá vách tại chỗ.

Từ khóa

#tương tác magma #đá vách #granodiorite #xenolith #hóa học đá biến chất #địa chất học xâm nhập

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