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Title: The source location of mantle plumes from 3D spherical models of mantle convection
Award ID(s):
1645245
NSF-PAR ID:
10052237
Author(s) / Creator(s):
;
Date Published:
Journal Name:
Earth and Planetary Science Letters
Volume:
478
Issue:
C
ISSN:
0012-821X
Page Range / eLocation ID:
47 to 57
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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  1. 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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