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首页> 外文期刊>Meteoritics & planetary science >FeO-rich silicates in the Sahara 97159 (EH3) enstatite chondrite: Mineralogy, oxygen isotopic compositions, and origin
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FeO-rich silicates in the Sahara 97159 (EH3) enstatite chondrite: Mineralogy, oxygen isotopic compositions, and origin

机译：撒哈拉沙漠97159（EH3）顽辉岩球粒陨石中的富FeO硅酸盐：矿物学，氧同位素组成和成因

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摘要

We report the mineralogy and oxygen isotopic compositions of FeO-rich silicates in the Sahara 97159 EH3 chondrite. This component is referred to as FeO-rich because it contains substantially more FeO than the characteristic FeO-poor silicates in the highly reduced enstatite meteorites. These FeO-rich silicates are mostly low-Ca pyroxene (Fs_(5-35)) and their compositions suggest an origin under more oxidizing conditions, like those for the ordinary chondrites. However, the mafic silicates in ordinary and carbonaceous chondrites are dominantly olivine, and the FeO-rich silicates in the E chondrites are less commonly olivine. The oxygen isotopic compositions of the FeO-rich silicates are indistinguishable from those of FeO-poor silicates in Sahara 97159. These observations suggest that both the FeO-rich silicates and the FeO-poor silicates in EH chondrites formed from the same oxygen reservoir where redox conditions varied widely.
机译：我们报告了撒哈拉97159 EH3球粒陨石中富含FeO的硅酸盐的矿物学和氧同位素组成。该组分被称为富含FeO，因为它在高度还原的顽辉陨石中比特征性的贫FeO硅酸盐含有更多的FeO。这些富FeO的硅酸盐大多为低钙辉石（Fs_（5-35）），它们的组成暗示了在更多氧化条件下的成因，如普通球粒陨石。但是，普通和碳质球粒陨石中的镁铁质硅酸盐主要为橄榄石，而E球粒陨石中的富含FeO的硅酸盐则较少为橄榄石。富含FeO的硅酸盐的氧同位素组成与撒哈拉沙漠97159中贫FeO的硅酸盐的氧同位素组成没有区别。这些观察结果表明，EH球粒陨石中的富FeO的硅酸盐和贫FeO的硅酸盐都由相同的储氧层形成，氧化还原条件差异很大。

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