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Premium Thermal evolution of sedimentary basin formation with variable thermal conductivity
Starin L.,
Yuen D. A.,
Bergeron Stephen Y.
Publication year2000
Publication title
geophysical research letters
Resource typeJournals
PublisherAmerican Geophysical Union
Understanding the thermal evolution of sedimentary basins is crucial for the geosciences and petroleum genesis. A recent model of thermal conductivity, based on microscopic physics, has shown that the variations of thermal conductivity depend nonlinearly on the temperature, pressure and mineralogy. The time‐dependent temperature equation takes on a nonlinear diffusive character with the temperature‐dependent portion of the thermal conductivity. We have compared the numerical solutions of the temperature fields, following a lithospheric stretching event between constant thermal conductivity and variable thermal conductivity. There is a great sensitivity of the thermal signatures to the parameter governing the influence of mineralogy on the phonon contribution to the thermal conductivity. For an olivine‐like lithosphere, differences on the order of 5% or 60 to 70K in the interior temperature between the two models can be expected. For times younger than 150 Myr, the topography for the variable conductivity model is shallower by around 5 to 10% than for the constant conductivity model, while the surface heat flow remains always lower for variable conductivity and the departure between the two conductivity models can reach 20% in the early stage. Variable thermal conductivity may play a non‐trivial role in thermal‐chemical reactive processes under basins.
Subject(s)geochemistry , geology , geomorphology , geophysics , mineralogy , petrology , physics , sedimentary basin , sedimentary rock , structural basin , thermal , thermal conductivity , thermodynamics
SCImago Journal Rank2.007

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