Carbonated mantle domains at the base of the Earth's transition zone
Sun, Wei-dong; Hawkesworth, Chris J.; Yao, Chao; Zhang, Chan-chan; Huang, Rui-fang; Liu, Xi; Sun, Xin-lei; Song, Mao-shuang; Ling, Ming-xing; Ding, Xing; Zhang, Zhao-feng; Fan, Wei-ming; Wu, Zhong-qing; Ireland, Trevor
The oxygen fugacity of the upper mantle is 3–4 orders of magnitude higher than that of the lower mantle and this has been attributed to Fe²⁺ disproportionating into Fe³⁺ plus Fe⁰ at pressures > 24 GPa. The upper mantle might therefore have been expected to have evolved to more oxidizing compositions through geological time, but it appears that the oxygen fugacity of the upper mantle has remained constant for the last 3.5 billion years. Thus, it indicates that the mantle has been actively...[Show more]
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