气候变化领域集成服务门户(CCPortal): Low Melting Temperature of Anhydrous Mantle Materials at the Core-Mantle Boundary

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DOI	10.1029/2020GL089345
	Low Melting Temperature of Anhydrous Mantle Materials at the Core-Mantle Boundary
	Kim T.; Ko B.; Greenberg E.; Prakapenka V.; Shim S.-H.; Lee Y.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:20
英文摘要	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. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	X ray scattering; Anhydrous mantle; Core-mantle boundary; Diffuse scattering; Diffuse X-ray scattering; In-situ detections; Low melting temperatures; Pyrolitic composition; Sensitivity of the probe; Melting point; concentration (composition); cooling; core-mantle boundary; diffusion; estimation method; melting; probe; scattering; temperature
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169569
作者单位	Department of Earth System Sciences, Yonsei University, Seoul, South Korea; School of Earth and Space Exploration, Arizona State University, Tempe, AZ, United States; Center for Advanced Radiation Sources, University of Chicago, Argonne, IL, United States
推荐引用方式 GB/T 7714	Kim T.,Ko B.,Greenberg E.,et al. Low Melting Temperature of Anhydrous Mantle Materials at the Core-Mantle Boundary[J],2020,47(20).
APA	Kim T.,Ko B.,Greenberg E.,Prakapenka V.,Shim S.-H.,&Lee Y..(2020).Low Melting Temperature of Anhydrous Mantle Materials at the Core-Mantle Boundary.Geophysical Research Letters,47(20).
MLA	Kim T.,et al."Low Melting Temperature of Anhydrous Mantle Materials at the Core-Mantle Boundary".Geophysical Research Letters 47.20(2020).