کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9531898 | 1638793 | 2005 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Compositionally zoned Cl-rich amphiboles from North Dabie Shan, China: monitor of high-pressure metamorphic fluid/rock interaction processes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Different generations of amphiboles are related to different metamorphic stages of the granulite in Yanzihe, and provide a monitor for fluid/rock interactions and P-T evolution during the high-pressure metamorphism of Dabie Shan. Pressure and temperature estimates suggest that Am-in was formed during prograde metamorphism of â¼10 kbar and 700-800 °C; Am-I was formed under peak metamorphic conditions (â¼20 kbar, 800-960 °C), whereas Am-II and Am-III were formed during retrograde metamorphic stages (560-770 °C and 5-7 kbar, and 520-670 °C and <5 kbar, respectively). In contrast to most previous studies, in which the earliest amphiboles to form are typically Cl-poor and later amphiboles become progressively Cl-rich, we show that the earliest amphiboles in the investigated rock are Cl-rich and later formed amphiboles are Cl-poor. The present study also demonstrates that the fluid system of the granulites in North Dabie Shan did not evolve in a simple way: while it behaved as a closed system during prograde and peak metamorphism, after the metamorphic peak it probably acted as an open system in which new fluids were introduced. The varying magnitude of Cl contents in amphiboles stresses the very local fluid control during metamorphism.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Lithos - Volume 81, Issues 1â4, April 2005, Pages 279-295
Journal: Lithos - Volume 81, Issues 1â4, April 2005, Pages 279-295
نویسندگان
Yilin Xiao, Jochen Hoefs, Andreas Kronz,