کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8850178 1618706 2018 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Multi-isotope (Ba, C, O) partitioning during experimental carbonatization of a hyper-alkaline solution
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Multi-isotope (Ba, C, O) partitioning during experimental carbonatization of a hyper-alkaline solution
چکیده انگلیسی
Carbonates formed from hyperalkaline aqueous solutions at the Earth́s surface are known to bear the most extreme disequilibrium isotope signatures reported so far in nature. We present here the results for stable carbon (C), oxygen (O), and barium (Ba) isotope fractionation during the precipitation of witherite (BaCO3) induced by the chemical absorption of atmospheric carbon dioxide (CO2) into an aqueous hyper-alkaline solution (at 4° and 21 °C; 1 atm total pressure). Independent from temperature, the barium carbonate formation was associated with a substantial enrichment of the lighter C and O isotopes in the solid compared to the atmosphere (C, O), close to previous results found in experiments and nature. A new approach is introduced to explain oxygen isotope fractionation upon hydroxylation of CO2. With Ba isotope enrichment factors between −0.45 and −0.53‰ (138/134ε) or −0.34 and −0.40‰ (137/134ε), respectively, the synthesized BaCO3 displays the highest kinetic enrichment of the light Ba isotope in the carbonate solid reported so far.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemie der Erde - Volume 78, Issue 2, May 2018, Pages 241-247
نویسندگان
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