کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4677080 1634782 2013 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Simultaneous calculation of metamorphic fluid fluxes, reaction rates and fluid–rock interaction timescales using a novel inverse modeling framework
ترجمه فارسی عنوان
محاسبه همزمان شار مایع متا مورفیک، سرعت واکنش و زمانبندی تعامل با روان فلزی، با استفاده از یک چارچوب مدلسازی معکوس
کلمات کلیدی
مدل سازی معکوس، مایع متامورف واکنش پذیر، تکامل دیفرانسیل، شارژ، نرخ عکس العمل
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
چکیده انگلیسی


• A new inverse modeling framework to constrain parameters of metamorphic fluid flow.
• The quasi-stationary state approximation in metamorphic systems is verified.
• Roles of parameters of metamorphic fluid flow were tested by sensitivity analysis.

To study metamorphic carbonation at greenschist facies conditions in the SW Scottish Highlands, a novel inverse modeling framework, which combines solutions of the transport equation with a global optimization method of differential evolution, was developed. Using this framework, we calculated simultaneously time-integrated and time-averaged metamorphic fluid fluxes of 83.4±35.4 m3 m−2 and 10–10.1±0.5 m3 m−2 s−1, respectively, a time-averaged reaction rate constant of 10–12.7–−10.2 m s−1 and comparable timescales for fluid flow and fluid-driven reaction of 104.3±0.5 yr and 102.7–5.2 yr, respectively. These parameters were calculated using an empirical estimate of the coefficient of molecular diffusion and a calculated value for metamorphic porosity. Our estimates are (1) consistent with single pass flow of fluid released by metamorphic devolatilization, (2) within the range where heat is transported by conduction and matter is transported by advection, (3) in agreement with an emerging consensus that metamorphic events are relatively short-lived, and (4) supportive of applying laboratory-based estimates of kinetic parameters to metamorphic systems. Based on a sensitivity analysis, we show that (1) selecting the diffusion coefficient (rather than fluid velocity, reaction rate or flow duration) as an input parameter yields more robust estimates of metamorphic fluid flow parameters, and (2) ignoring reaction-dependent porosity and reaction rates can result in an order-of-magnitude uncertainty in best-fit flow parameters, evaluated from concentration profiles. Finally, similarity between our calculated time-averaged metamorphic fluid fluxes which were obtained numerically and those which were obtained analytically confirms the validity of using the ‘quasi-stationary state’ assumption to quantify metamorphic fluid flow parameters.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 373, 1 July 2013, Pages 217–227
نویسندگان
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