کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8910196 | 1637485 | 2018 | 51 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Fractionation of the isotopes of boron between granitic melt and aqueous solution at 700â¯Â°C and 800â¯Â°C (200â¯MPa)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
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چکیده انگلیسی
Results from the current study show significant fractionation of boron's isotopes between granitic melt and aqueous solution at these high temperatures. Values of Î11BM-V for 'Low B' and 'High B' glasses range from â10.9 (±1.3â°) to â6.1 (±1.7â°) at 800â¯Â°C and â7.8 (±1.5â°) to â5.3 (±1.3â°) at 700â¯Â°C, and the Î11BM-V values do not correlate with the concentration of B in melt (glass). One experiment (CGB88) conducted at 750â¯Â°C and 200â¯MPaH2O using MAC yielded a Î11BM-V value (â8.4â°) similar to that reported by Hervig et al. (2002). The Î11BM-V values reported in this study form a linear trend with temperature through the Î11B values for boromuscovite-aqueous solution, illite-aqueous solution, and melt-aqueous solution. Therefore, based on the results of this study, we concur with Hervig et al. (2002) that the fraction of B in 4-fold coordination in hydrous granitic melt is significant, if this is the fundamental cause of the fractionation effect. Spectroscopic studies on hydrous glass compositions similar to those reported in this study might elucidate the coordination environment of B in melts to the extent that its structural state is quenchable.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Geology - Volume 489, 20 June 2018, Pages 16-27
Journal: Chemical Geology - Volume 489, 20 June 2018, Pages 16-27
نویسندگان
James L. IV, David London,