Interplay of variable thermal conductivity and expansivity on the thermal structure of oceanic lithosphere

Details Interplay of variable thermal conductivity and expansivity on the thermal structure of oceanic lithosphere Interplay of variable thermal conductivity and expansivity on the thermal structure of oceanic lithosphere

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..351h&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 2, p. 351-354

Physics

Geophysics

6

Marine Geology And Geophysics: Heat Flow (Benthic) And Hydrothermal Processes, Marine Geology And Geophysics: Plate Tectonics, Marine Geology And Geophysics: Seafloor Morphology And Bottom Photography

Scientific paper

The sensitivity of pressure- and temperature-dependent thermal conductivity (k:W/m/K) and the thermal expansivity (α:1/K) on the thermal structure of the oceanic plate is investigated parametrically by comparing the ocean floor depth and heat flux calculated by one-dimensional conduction model with those of GDH1, a theoretical thermal model of the oceanic lithosphere. We find that an optimum fit is obtained, when the value of thermal expansivity is ~3×10-5, while those associated with the thermal conductivity have many possibilities. The estimates, which give an equally good fit to the GDH1 model, of the plate thickness D (km) and the temperature at the base of the plate Tm(°C) may be given by Tm~1450-(k0-4.5)×100-(α-3.0×10-5)×105×100, D~90+(k0-4.5)×20-(α-3.0×10-5)×105×20 where k0(W/m/K) is the lattice thermal conductivity at the ocean floor. A similar relation is obtained for constant thermal conductivity.

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