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Carbon isotope fractionation during experimental crystallisation of diamond from carbonate fluid at mantle conditions

机译:在地幔条件下金刚石从碳酸盐流体中结晶实验过程中的碳同位素分馏

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We report first results of a systematic study of carbon isotope fractionation in a carbonate fluid system under mantle PT conditions. The system models a diamond-forming alkaline carbonate fluid using pure sodium oxalate (Na2C2O4) as the starting material, which decomposes to carbonate, CO2 and elementary carbon (graphite and diamond) involving a single source of carbon following the reaction 2Na(2)C(2)O(4) -> 2Na(2)CO(3) + CO2 + C. Near-liquidus behaviour of carbonate was observed at 1300 degrees C and 6.3 GPa. The experimentally determined isotope fractionation between the components of the system in the temperature range from 1300 to 1700 degrees C at 6.3 and 7.5 GPa fit the theoretical expectations well. Carbon isotope fractionation associated with diamond crystallisation from the carbonate fluid at 7.5 GPa decreases with an increase in temperature from 2.7 to 1.6 parts per thousand. This trend corresponds to the function Delta(Carbonate fluid-Diamond) = 7.38 x 10(6) T-2.
机译:我们报告了在地幔PT条件下碳酸盐流体系统中碳同位素分馏的系统研究的初步结果。该系统使用纯草酸钠(Na2C2O4)作为起始原料对形成金刚石的碱性碳酸盐流体进行建模,在反应2Na(2)C之后,其分解为碳酸盐,CO2和单碳源的碳素(石墨和钻石) (2)O(4)-> 2Na(2)CO(3)+ CO2 +C。在1300摄氏度和6.3 GPa下观察到碳酸盐的近液相线行为。实验确定的系统组分之间的同位素分馏在6.3和7.5 GPa的温度下(从1300到1700摄氏度)非常符合理论预期。与金刚石从7.5 GPa的碳酸盐流体中结晶相关的碳同位素分馏随着温度从2.7至千分之1000的增加而降低。该趋势对应于函数Delta(碳酸流体-金刚石)= 7.38 x 10(6)T-2。

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