Journal Article PUBDB-2024-06367

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The Thermal Conductivity of Bridgmanite at Lower Mantle Conditions Using a Multi‐Technique Approach

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2024
Wiley Hoboken, NJ

JGR / Solid earth 129(6), e2024JB028823 () [10.1029/2024JB028823]
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Abstract: The thermal conductivity of bridgmanite, the primary constituent of the Earth's lower mantle, has been investigated using diamond anvil cells at pressures up to 85 GPa and temperatures up to 3,100 K. We report the results of time-domain optical laser flash heating and X-ray Free Electron Laser heating experiments from a variety of bridgmanite samples with different Al and Fe contents. The results demonstrate that Fe or Fe,Al incorporation in bridgmanite reduces thermal conductivity by about 50% in comparison to end-member MgSiO$_3$ at the pressure-temperature conditions of Earth's lower mantle. The effect of temperature on the thermal conductivity at 28–60 GPa is moderate, well described as $k = k_{300}(300/T)^a$, where a is 0.2–0.5. The results yield thermal conductivity of 7.5–15 W/(m × K) in the thermal boundary layer of the lowermost mantle composed of Fe,Al-bearing bridgmanite.

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Note: ISSN 2169-9356 not unique: **2 hits**. Waiting for fulltext

Contributing Institute(s):
  1. PETRA-D (FS-PETRA-D)
  2. FS-PS Fachgruppe HIBEF (FS-HIBEF)
  3. DOOR-User (DOOR ; HAS-User)
  4. HED (XFEL_E1_HED)
Research Program(s):
  1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
  2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
  3. SEPtiM - Solidification of Earth's Primitive Mantle (101019965) (101019965)
Experiment(s):
  1. PETRA Beamline P02.2 (PETRA III)

Appears in the scientific report 2024
Database coverage:
Medline ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection
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 Record created 2024-10-21, last modified 2025-07-15


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