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Springer Science and Business Media LLC Nature Communications 15(1)
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    초록·키워드

    To gain insights into the composition and heterogeneity of Earth's interior, the partial pressure of oxygen (oxygen fugacity, or fO<sub>2</sub>) in igneous rocks is characterized. A surprising observation is that relative to reference buffers, fO<sub>2</sub>s of mantle melts (mid-ocean ridge basalts, or MORBs) and their presumed mantle sources (abyssal peridotites) differ. Globally, MORBs have near-uniform fO<sub>2</sub>s, whereas abyssal peridotites vary by about three orders of magnitude, suggesting these intimately related geologic reservoirs are out of equilibrium. Here, we characterize fO<sub>2</sub>s of mantle melting increments represented by plagioclase-hosted melt inclusions, which were entrapped as basaltic melts migrated from their sources toward the seafloor. At temperatures and fO<sub>2</sub>s constrained by rare earth element distributions, a range of fO<sub>2</sub>s consistent with the abyssal peridotites is recovered. The fO<sub>2</sub>s are correlated with geochemical proxies for mantle melting, suggesting partial melting of Earth's mantle decreases its fO<sub>2</sub>, and that the uniformity of MORB fO<sub>2</sub>s is a consequence of the melting process and plate tectonic cycling.

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