کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6436176 1637553 2016 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Investigating the effects of growth rate and temperature on the B/Ca ratio and δ11B during inorganic calcite formation
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Investigating the effects of growth rate and temperature on the B/Ca ratio and δ11B during inorganic calcite formation
چکیده انگلیسی


- B co-precipitation into inorganic calcite depends on temperature and growth rate.
- B isotope fractionation into inorganic calcite depends on growth rate.
- The concept of the surface entrapment model can explain B co-precipitation into inorganic calcite.

To deconvolve the effect of growth rate and temperature on the boron partitioning into calcite and its isotope fractionation, seeded calcite precipitation experiments were performed at a constant temperature and various growth rates and at a constant growth rate and various temperatures. We show that boron partitioning increases with increasing growth rate and decreases with increasing temperature. The B isotope fractionation between calcite and B(OH)4− increases with increasing growth rate favoring the lighter B isotope for incorporation into calcite whereas no effect of temperature was observed within the temperature range investigated (12 °C to 32 °C). At the lowest temperature and growth rate δ11B of the calcite almost equals that of B(OH)4− in solution. Applying the surface entrapment model (SEMO) of Watson and Liang (1995) to our data, we demonstrate that the observed effects of temperature and growth rate on B concentration can be explained by processes in the near surface layer of the calcite crystal.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Geology - Volume 421, 10 February 2016, Pages 81-92
نویسندگان
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