Thermal conductivity of aluminous garnets in Earth’s deep interior
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2023-04-21 |
| Journal | American Mineralogist |
| Authors | Yu-Ping Hung, Yi‐Chi Tsao, Chun‐Hung Lin, Wen‐Pin Hsieh |
| Institutions | Institute of Earth Sciences, Academia Sinica, National Taiwan University |
| Citations | 2 |
Abstract
Section titled “Abstract”Abstract Aluminous garnets [(Mg,Fe,Ca)3Al2(SiO4)3] are a key mineral group in Earth’s interior. Their thermal conductivity with relevant chemical compositions and at high-pressure-temperature (P-T) conditions plays a crucial role in affecting the thermal states of pyrolytic mantle and subducted basaltic crust over the depth range they are present. Using ultrafast optical pump-probe spectroscopy combined with an externally-heated diamond-anvil cell, we have precisely determined the high-P-T thermal conductivity of aluminous garnets, including pyrope, grossular, and pyrope-almandine solid solution. We find that the variable chemical composition has minor effects on the thermal conductivity of these garnets over the P-T range studied. Combined with previous results, we provide new depth-dependent thermal conductivity profiles for a pyrolytic mantle and a subducted basaltic crust. These results significantly benefit geodynamics simulations and advance our understanding of the thermal structure and evolution dynamics in Earth’s upper mantle and transition zone. In addition, as garnets are also a key, useful material family for modern technology, our results on the thermal property of natural garnets also shed light on the novel design of optical and electronic devices based on various synthetic nonsilicate garnets.
Tech Support
Section titled “Tech Support”Original Source
Section titled “Original Source”References
Section titled “References”- 2015 - Sound velocities of Fe3Al2Si3O12 almandine up to 19 GPa and 1700 K [Crossref]
- 1978 - Elastic properties of garnet solid-solution series [Crossref]
- 2016 - Thermodynamics and phonon dispersion of pyrope and grossular silicate garnets from ab initio simulations [Crossref]
- 2004 - Analysis of heat flow in layered structures for time-domain thermoreflectance [Crossref]
- 2014 - Nanoscale thermal transport. II. 2003-2012 [Crossref]
- 2017 - Hydration-reduced lattice thermal conductivity of olivine in Earth’s upper mantle [Crossref]
- 2011 - Thermal conductivity of compressed H2O to 22 GPa: A test of the Leibfried-Schlömann equation [Crossref]
- 1999 - The high-pressure, single-crystal elasticity of pyrope, grossular, and andradite [Crossref]
- 2009 - Electrical conductivity of pyrope-rich garnet at high temperature and high pressure [Crossref]
- 1988 - Ocean bathymetry and mantle convection 1. Large-scale flow and hotspots [Crossref]