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首页> 外文期刊>Contributions to Mineralogy and Petrology >Liquidus karrooite stability and composition at reducing conditions
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Liquidus karrooite stability and composition at reducing conditions

机译:液相还原条件下液相线型核铁矿的稳定性和组成

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We have determined the stability of rutile and karrooite on the liquidus of pseudobinary silicate melts of anorthite-diopside eutectic composition with, in addition, of up to 32 wt percent TiO_2 at one atm total pressure and at wide range of oxygen fugacities. At 1,300 deg C and at an fO_2 below 10~(-11.2) atm rutile (TiO_2) is replaced as liquidus phase by the pseudobrookite-type MgTi_2O_5-Ti_3O_5 solid solution with some Al in the crystal structure. The composition of karrooite was found to be strongly dependent on oxygen fugacity. Crystalline phases were identified by transmission electron microscopy (TEM). The results obtained in this study are relevant for understanding the chemistry of lunar armalcolites. Using "excess" rutile solubility at reducing conditions, we estimated the Ti~(4 +) /Ti~(3 +) ratio in silicate melts at 1.300 deg C as function of fO_2
机译:我们已经确定了在一个大气压总压力和宽范围的氧逸度下,钙长石-透辉石共晶组合物的准二元硅酸盐熔体的液相线中的金红石和铁矾石的稳定性,此外,TiO_2含量高达32 wt%。在1,300摄氏度和低于10〜(-11.2)的fO_2下,金红石(TiO_2)被液相结构的伪板钛矿型MgTi_2O_5-Ti_3O_5固溶体取代,其中的Al处于晶体结构中。已经发现,核铁矿的组成强烈依赖于氧逸度。通过透射电子显微镜(TEM)鉴定结晶相。在这项研究中获得的结果与了解月球粉的化学性质有关。使用还原条件下的“过量”金红石溶解度,我们估算了在1.300℃下硅酸盐熔体中Ti〜(4 +)/ Ti〜(3 +)的比率与fO_2的关系

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