FERRIC IRON IN PERIDOTITES AND MANTLE OXIDATION-STATES
FERRIC IRON IN PERIDOTITES AND MANTLE OXIDATION-STATES
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DOI：
10.1016/0012-821x(94)90268-2
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发表时间：
1994-05-01
影响因子：
5.3
通讯作者：
CARSWELL, DA
中科院分区：
文献类型：
--
作者：
CANIL, D;ONEILL, HS;CARSWELL, DA
利用Fe-57穆斯堡尔光谱对来自法国中部、澳大利亚东南部、坦桑尼亚北部、非洲南部和西伯利亚的28个特征良好的辉石岩和橄榄岩包体的Fe3+/ sigmae比值和Fe2O3含量进行了估算。对不同地幔区域的Fe2O3含量进行了评估，发现Fe2O3含量在0.1 ~ 0.4 wt%之间。通过对地幔中碳、氢、硫元素的估计，表明这些挥发性元素和铁元素对橄榄岩中的氧具有相似的缓冲能力。因此，上地幔橄榄岩的氧化态一般不应受任何特定缓冲体系的控制。对克拉通榴石橄榄岩氧化态的新估计表明，克拉通下的上地幔位于法雅石-磁铁矿-石英（FMQ）缓冲带的1个log单位范围内，但可能自太古宙早期原始形成以来已被逐渐氧化。
Fe-57 Mossbauer spectroscopy is employed to estimate Fe3+/SIGMAFe ratios and the Fe2O3 content of 28 well characterized pyroxenite and peridotite xenoliths from central France, southeastern Australia, northern Tanzania, southern Africa and Siberia. The Fe2O3 contents of various mantle regions were assessed, and found to range from 0.1 to 0.4 wt%. With an appraisal of the likely mantle inventories of C, H and S, the results demonstrate that these volatile elements and Fe all have similar buffering capacities for oxygen in peridotites. For this reason, the oxidation states of upper mantle peridotites should not generally be controlled by any particular buffer system.New estimates for the oxidation states of cratonic garnet peridotites indicate that the upper mantle beneath cratons is within 1 log unit of the fayalite-magnetite-quartz (FMQ) buffer, but may have been progressively oxidized since its original formation in the early Archean.