Geophysical implications of reduction in thermal conductivity due to hydration

Details Geophysical implications of reduction in thermal conductivity due to hydration Geophysical implications of reduction in thermal conductivity due to hydration

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3311310h&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 11, CiteID L11310

Physics

5

Mineral Physics: General Or Miscellaneous, Physical Properties Of Rocks: Transport Properties, Tectonophysics: Heat Generation And Transport, Tectonophysics: Planetary Interiors (5430, 5724, 6024), General Or Miscellaneous: Techniques Applicable In Three Or More Fields

Scientific paper

Laser-flash measurements show that hydration lowers the lattice component of thermal diffusivity (D) for calcic and Fe-Mg garnets, and glasses. Hydration depresses D above the glass transition, suggesting that melts respond likewise. For garnets, which have a wide range of total water and OH- contents (X), ∂(lnD)/∂X = -0.003%/ppm H2O. For olivine and quartz, D is constant, but thermal conductivity (k = ρCPD) decreases because hydration lowers density (ρ) but negligibly changes heat capacity (CP). This finding is geophysically significant: specifically, it suggests that hydration leads to heat retention, promoting convective instabilities and melting.

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