Multidisciplinary Constraints on the Thermal‐Chemical Boundary Between Earth's Core and Mantle

Frost, Daniel A.; Avery, Margaret S.; Buffett, Bruce A.; Chidester, Bethany A.; Deng, Jie; Dorfman, Susannah M.; Li, Zhi; Liu, Lijun; Lv, Mingda; Martin, Joshua F.

doi:10.1029/2021GC009764

Multidisciplinary Constraints on the Thermal‐Chemical Boundary Between Earth's Core and Mantle

Journal Article · Mon Feb 28 00:00:00 EST 2022 · Geochemistry, Geophysics, Geosystems

DOI:https://doi.org/10.1029/2021GC009764· OSTI ID:1846677

^[1]; ^[2]; ^[1]; ^[3]; ^[4]; ^[5]; ^[6]; ^[7]; ^[5]; Martin, Joshua F. ^[8]

University of California, Berkeley Berkeley CA USA
University of California, Berkeley Berkeley CA USA, U.S. Geological Survey, Moffett Field Menlo Park CA USA
University of California, Davis Davis CA USA
University of California, Los Angeles Los Angeles CA USA
Michigan State University East Lansing MI USA
University of Cambridge Cambridge UK
University of Illinois at Urbana‐Champaign Champaign IL USA
The Ohio State University Columbus OH USA

Abstract

Heat flux from the core to the mantle provides driving energy for mantle convection thus powering plate tectonics, and contributes a significant fraction of the geothermal heat budget. Indirect estimates of core‐mantle boundary heat flow are typically based on petrological evidence of mantle temperature, interpretations of temperatures indicated by seismic travel times, experimental measurements of mineral melting points, physical mantle convection models, or physical core convection models. However, previous estimates have not consistently integrated these lines of evidence. In this work, an interdisciplinary analysis is applied to co‐constrain core‐mantle boundary heat flow and test the thermal boundary layer (TBL) theory. The concurrence of TBL models, energy balance to support geomagnetism, seismology, and review of petrologic evidence for historic mantle temperatures supports Q _CMB ∼15 TW, with all except geomagnetism supporting as high as ∼20 TW. These values provide a tighter constraint on core heat flux relative to previous work. Our work describes the seismic properties consistent with a TBL, and supports a long‐lived basal mantle molten layer through much of Earth's history.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: European Research Council (ERC); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003842

OSTI ID:: 1846677

Alternate ID(s):: OSTI ID: 1854612
OSTI ID: 1978512

Journal Information:: Geochemistry, Geophysics, Geosystems, Journal Name: Geochemistry, Geophysics, Geosystems Journal Issue: 3 Vol. 23; ISSN 1525-2027

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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Convection, composition, and the thermal state of the lower mantle

Journal Article · Mon Sep 10 00:00:00 EDT 1979 · J. Geophys. Res.; (United States) · OSTI ID:5858717

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Multidisciplinary Constraints on the Thermal‐Chemical Boundary Between Earth's Core and Mantle

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