Crystal Chemistry of Some Silicates and Carbonates

网络结构中Al和Si的扩散大大增强 在氢气存在下，在大于10 kbar的压力下，和 长石的有序-无序反应速率为 加速到一定程度， 在不存在水的情况下，在 温度低至650 oC。 此外，直接无水氧 可以进行碳酸盐和硅酸盐之间的同位素交换， 出去 氢激活高压扩散强化 在本项目中，将从以下几个方面进行：a）反应 机制等B）结构状态平衡。 c）平衡 CaCO 3与石英之间的氧同位素分馏因子， 钠长石、钙长石、钙铝榴石将进一步细化， 磁铁矿、层状构造和角闪石。 （四） KAlSi_3O_8在高压下的水热熔融关系， 追究 加速这些扩散机制， 氢的存在将使我们能够在实验室中确定， 时间尺度，地质年代中发生的自然反应。

Diffusion of Al and Si in network structures is greatly enhanced at pressures greater than 10 kbar in the presence of hydrogen, and the rate of the order-disorder reaction in feldspar is accelerated enough that structural state equilibration of some compositions was achieved, in the absence of water, at temperatures as low as 650oC. Further, direct anhydrous oxygen isotopic exchange between carbonates and silicates can be carried out. Hydrogen activated high-pressure diffusional enhancement will be pursued in this project in several directions: a)Reaction mechanisms. b) Structural state equilibration. c) Equilibrium oxygen isotope fractionation factors between CaCO3 and quartz, albite, anorthite, grossular will be further refined, and extended to magnetite, layer structures and amphiboles. d) The hydrothermal melting relations of KAlSi3O8 at high pressures will be investigated. Speeding up these diffusional mechanisms by the presence of hydrogen will permit us to determine, in laboratory time scales, natural reactions that occur in geologic time.