Low Melting Temperature of Anhydrous Mantle Materials at the Core‐Mantle Boundary

Kim, Taehyun; Ko, Byeongkwan; Greenberg, Eran; Prakapenka, Vitali; Shim, Sang‐Heon; Lee, Yongjae

doi:10.1029/2020GL089345

Title: Low Melting Temperature of Anhydrous Mantle Materials at the Core‐Mantle Boundary

Journal Article · 18 October 2020 · Geophysical Research Letters

DOI: https://doi.org/10.1029/2020GL089345 · OSTI ID:1786751

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Department of Earth System Sciences Yonsei University Seoul South Korea
School of Earth and Space Exploration Arizona State University Tempe AZ USA
Center for Advanced Radiation Sources University of Chicago Argonne IL USA

Abstract One of the central challenges in accurately estimating the mantle melting temperature is the sensitivity of the probe for detecting a small amount of melt at the solidus. To address this, we used a multichannel collimator to enhance the diffuse X‐ray scattering from a small amount of melt and probed an eutectic pyrolitic composition to increase the amount of melt at the solidus. Our in situ detection of diffuse scattering from the pyrolitic melt determined an anhydrous melting temperature of 3,302 ± 100 K at 119 ± 6 GPa and 3,430 ± 130 K at the core‐mantle boundary (CMB) conditions, as the upper bound temperature. Our CMB temperature is approximately 700 K lower than the previous estimates, implying much faster secular cooling and higher concentrations of S, C, O, and/or H in the region, and nonlinear, advocating the basal magma ocean hypothesis.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-06CH11357; FG02-94ER14466

OSTI ID:: 1786751

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 20 Vol. 47; ISSN 0094-8276

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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