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首页> 外文期刊>Contributions to Mineralogy and Petrology >Double carbonate breakdown reactions at high pressures: an experimental study in the system CaO-MgO-FeO-MnO-CO_2
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Double carbonate breakdown reactions at high pressures: an experimental study in the system CaO-MgO-FeO-MnO-CO_2

机译：高压下碳酸氢盐的双重分解反应：CaO-MgO-FeO-MnO-CO_2系统的实验研究

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摘要

The pressure-temperature conditions of the reactions of the double carbonates CaM(CO_3)_2 where M = Mg (dolomite), Fe (ankerite) and Mn (kutnoh-orite), to MCO_3 plus CaCO_3 (aragonite) have been investigated at 5-8 GPa, 600-1,100 deg C, using multi-anvil apparatus. The reaction dolomite = magne-site + aragonite is in good agreement with the results of Sato and Katsura (Earth Planet Sci 184:529-534, 2001), but in poor agreement with the results of Luth (Contrib Mineral Petrol 141:222-232, 2001). The dolomite is partially disordered at 620 deg C, and fully disordered at l,100 deg C. All ankerite and kutnohorite samples, including the synthetic starting materials, are disordered. The P-T slopes of the three reactions increase in the order M - Mg, Fe, Mn. The shallower slope for the reaction involving magnesite is due partly to its having a higher compressibility than expected from unit-cell volume considerations. At low pressures there is a preference for partitioning into the double carbonate of Mg > Fe > Mn. At high pressures the partitioning preference is reversed. Using the measured reaction positions, the P-T conditions at which dolomite solid solutions will break down on increasing P and T in subduction zones can be estimated.
机译：已经在5℃下研究了双碳酸盐CaM（CO_3）_2的反应的压力温度条件，其中M = Mg（白云石），Fe（无烟煤）和Mn（kutnoh-红土）。使用多砧设备，在600-1,100摄氏度下达到8 GPa。白云石=镁矿+文石的反应与Sato和Katsura的结果（Earth Planet Sci 184：529-534，2001）很好地吻合，但是与Luth的结果（Contrib Mineral Petrol 141：222- 232，2001）。白云石在620℃时部分无序，在1100℃时完全无序。所有的无烟石和kutnohorite样品，包括合成原料，都无序。三个反应的P-T斜率按M-Mg，Fe，Mn的顺序增加。涉及菱镁矿的反应的较浅斜率部分是由于其具有比从单元细胞体积考虑所预期的更高的可压缩性。在低压下，优先分配到Mg> Fe> Mn的双碳酸盐中。在高压下，分配偏好被逆转。使用测得的反应位置，可以估算出俯冲带中白云石固溶体随着P和T的增加而分解的P-T条件。

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