The Thermal Conductivity of Bridgmanite at Lower Mantle Conditions Using a Multi‐Technique Approach
Eric Edmund
(1)
,
Irina Chuvashova
(1)
,
Zuzana Konôpková
(2)
,
Rachel Husband
(3)
,
Cornelius Strohm
(3)
,
Karen Appel
(2)
,
Carsten Bähtz
(2)
,
Orianna Ball
(4)
,
Victorien Bouffetier
(2)
,
Kara Brugman
(1)
,
Khachiwan Buakor
(2)
,
Julien Chantel
(5)
,
Stella Chariton
(6)
,
Matthew Duff
(4)
,
Anand Dwivedi
(2)
,
Konstantin Glazyrin
(3)
,
S. M. A. Hosseini‐saber
(3)
,
Nicolas Jaisle
(7)
,
Torsten Laurus
(3)
,
Xiang Li
(8)
,
Bernhard Masani
(4)
,
James Mchardy
(4)
,
Malcolm Mcmahon
(4)
,
Sébastien Merkel
(5)
,
Katharina Mohrbach
(3)
,
Anshuman Mondal
(3)
,
Guillaume Morard
(7)
,
Vitali B. Prakapenka
(9)
,
Clemens Prescher
(10)
,
Young‐jay Ryu
(9)
,
Jan‐patrick Schwinkendorf
(2)
,
Minxue Tang
(3)
,
Zena Younes
(4)
,
Carmen Sanchez‐valle
(8)
,
Hanns‐peter Liermann
(3)
,
James Badro
(11)
,
Jung‐fu Lin
(12)
,
R. Stewart Mcwilliams
(4)
,
Alexander F. Goncharov
(13)
1
Carnegie Earth and Planets Laboratory
2 European XFEL Gmbh
3 DESY - Deutsches Elektronen-Synchrotron [Hamburg]
4 Edin. - University of Edinburgh
5 UMET - Unité Matériaux et Transformations - UMR 8207
6 CARS - Center for Advanced Radiation Sources [University of Chicago]
7 USMB [Université de Savoie] [Université de Chambéry] - Université Savoie Mont Blanc
8 WWU - Westfälische Wilhelms-Universität Münster = University of Münster
9 University of Chicago
10 University of Freiburg [Freiburg]
11 UPCité - Université Paris Cité
12 University of Texas at Austin [Austin]
13 Carnegie Institution for Science
2 European XFEL Gmbh
3 DESY - Deutsches Elektronen-Synchrotron [Hamburg]
4 Edin. - University of Edinburgh
5 UMET - Unité Matériaux et Transformations - UMR 8207
6 CARS - Center for Advanced Radiation Sources [University of Chicago]
7 USMB [Université de Savoie] [Université de Chambéry] - Université Savoie Mont Blanc
8 WWU - Westfälische Wilhelms-Universität Münster = University of Münster
9 University of Chicago
10 University of Freiburg [Freiburg]
11 UPCité - Université Paris Cité
12 University of Texas at Austin [Austin]
13 Carnegie Institution for Science
Sébastien Merkel
- Fonction : Auteur
- PersonId : 3148
- IdHAL : sebastien-merkel
- ORCID : 0000-0003-2767-581X
- IdRef : 147966698
Résumé
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 MgSiO3 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 , 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.