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首页> 外文期刊>Contributions to Mineralogy and Petrology >Mineral-fluid equilibria in the system CaO-MgO-SiO_2-H_2O-CO_2-NaCl and the record of reactive fluid flow in contact metamorphic aureoles
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Mineral-fluid equilibria in the system CaO-MgO-SiO_2-H_2O-CO_2-NaCl and the record of reactive fluid flow in contact metamorphic aureoles

机译：CaO-MgO-SiO_2-H_2O-CO_2-NaCl体系中的矿物液平衡及接触变质金极中反应性流体流动的记录

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摘要

Phase equilibria in the system CaO-MgO-SiO_2-H_2O-CO_2-NaCl are calculated to illustrate phase relations in metacarbonates over a wide-range of P-T--X[H_2O-CO_2-NaCl] conditions. Calculations are performed using the equation of state of Duan et al. (Geochim Cosmochim Acta 59:2869-2882, 1995) for H_2O-CO_2-NaCl fluids and the internally consistent data set of Gottschalk (Eur J Mineral 9:175-223, 1997) for thermodynamic properties of solids. Results are presented in isothermal-isobarical plots showing stable mineral assemblages as a function of fluid composition. It is shown that in contact-metamorphic P-T regimes the presence of very small concentrations of NaCl in the fluid causes almost all decarbonation reactions to proceed within the two fluid solvus of the H_2O-CO_2-NaCl system. Substantial flow of magma-derived fluids into marbles has been documented for many contact aureoles by shifts in stable isotope geochemistry of the host rocks and by the progress of volatile-producing mineral reactions controlled by fluid compositions. Time-integrated fluid fluxes have been estimated by combining fluid advection/dispersion models with the spatial arrangement of mineral reactions and isotopic resetting. All existing models assume that minerals react in the presence of a single phase H_2O-CO_2 fluid and do not allow for the effect that fluid immiscibility has on the flow patterns.
机译：计算了CaO-MgO-SiO_2-H_2O-CO_2-NaCl体系中的相平衡，以说明在宽范围的P-T--X [H_2O-CO_2-NaCl]条件下碳酸根的相关系。使用Duan等人的状态方程进行计算。 （Geochim Cosmochim Acta 59：2869-2882，1995）中的H_2O-CO_2-NaCl流体和内部一致的Gottschalk数据集（Eur J Mineral 9：175-223，1997）。结果以等温-等压线图形式表示，该图显示了稳定的矿物组合随流体组成的变化。结果表明，在接触变质的P-T体系中，流体中极少量NaCl的存在会导致几乎所有脱碳反应在H_2O-CO_2-NaCl系统的两种流体溶液中进行。大量岩浆流体流入大理石后，由于接触岩的稳定同位素地球化学变化以及受流体成分控制的产生挥发性矿物的反应的进展，已记录了许多接触性金刚烷大量流入大理石的现象。通过将流体对流/弥散模型与矿物反应的空间布置和同位素重置相结合，可以估算出时间积分流体通量。所有现有模型均假设矿物在单相H_2O-CO_2流体存在下发生反应，并且不考虑流体不混溶性对流型的影响。

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