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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Experimental investigation on dolomite dissociation into aragonite+magnesite up to 8.5 GPa
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Experimental investigation on dolomite dissociation into aragonite+magnesite up to 8.5 GPa

机译：高达8.5 GPa的白云石分解为文石+菱镁矿的实验研究

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We carried out high-pressure and high-temperature experiments on the composition CaMg(CO_3)_2 to determine the equilibrium boundary of dolomite=aragonite+magnesite up to 8.5 GPa and 1200 ℃, using a 6-8 type multianvil high-pressure apparatus employing a quenching technique. Dolomite dissociates into aragonite and magnesite under high P-T conditions and the phase boundary of dissociation is described by a linear equation P (GPa) = 1.75 + 0.0061T (℃). At P > 6.3 GPa and T > 800 ℃, the equilibrium boundary was established by reverse and backward experiments to grow dolomite from mixtures of CaCO_3 and MgCO_3 with or without dolomite, respectively. This study suggests that the equilibrium line of the dolomite=aragonite+magnesite reaction could be very useful in addition to phase transformation of quartz-coesite and graphite-diamond to constrain P-T conditions for the metamorphism of dolomite-bearing ultrahigh-pressure rocks.
机译：我们使用6-8型多砧高压装置，对组成为CaMg（CO_3）_2的高压和高温实验进行了测定，以确定高达8.5 GPa和1200℃的白云石=文石+菱镁矿的平衡边界。淬火技术。在高P-T条件下，白云石分解为文石和菱镁矿，并且解离的相界由线性方程P（GPa）= 1.75 + 0.0061T（℃）描述。在P> 6.3 GPa和T> 800℃时，通过反向和反向实验建立了平衡边界，以分别从含或不含白云石的CaCO_3和MgCO_3的混合物中生长白云石。这项研究表明，白云石=文石+菱镁矿反应的平衡线除了对石英-柯氏岩和石墨-金刚石的相变以约束P-T条件以用于含白云石的超高压岩石的变质外，可能非常有用。

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