کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8910168 | 1637481 | 2018 | 30 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Deuteriumâhydrogen inter-diffusion in chlorite
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Interactions between aqueous fluids and rocks occur in a broad range of contexts ranging from hydrothermal alteration veins to regional metamorphism. Tracking these processes and understanding their reaction kinetics require a precise knowledge of the diffusion of water in rocks, and of isotope fractionation in major minerals, such as chlorite. Deuteriumâhydrogen exchange between Mg-rich chlorite and water (D2O) was experimentally investigated using a belt press over the temperature range of 315-650â¯Â°C at pressures of 1.5â¯GPa and 3â¯GPa. Both chloritite chip and chlorite powder were used. D/(Dâ¯+â¯H) ratios in chlorite grains were mapped using Raman spectroscopy. Deuteriumâhydrogen exchange proceeded by deuteriumâhydrogen inter-diffusion in chlorite (lattice diffusion). As chlorite is a phyllosilicate, i.e. an anisotropic mineral, diffusion coefficients were determined for crystallographic directions parallel and perpendicular to the silicate layers (perpendicular and parallel to the c* axis, respectively). Arrhenius relations for deuteriumâhydrogen inter-diffusion coefficients were derived from the new dataset. Activation energy (E) is comprised between 215â¯Â±â¯21 (1Ï) kJ/mol (perpendicular to the c* axis) and 194â¯Â±â¯21â¯kJ/mol (parallel to the c* axis). Log10(D0) is â2.2â¯Â±â¯1.3â¯m2/s for diffusion in the direction perpendicular to the c* axis and â4.5â¯Â±â¯1.3â¯m2/s for diffusion parallel to it. The bulk diffusion law derived from a combination of our data with data from Graham et al. (1987) yields Eâ¯=â¯176â¯Â±â¯8â¯kJ/mol and log10(D0)â¯=â¯â5.1â¯Â±â¯0.4â¯m2/s.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Geology - Volume 493, 20 August 2018, Pages 518-524
Journal: Chemical Geology - Volume 493, 20 August 2018, Pages 518-524
نویسندگان
Anne-Céline Ganzhorn, Hélène Pilorgé, Sylvie Le Floch, Gilles Montagnac, Hervé Cardon, Bruno Reynard,