Heat production and heat flow in the mantle lithosphere, Slave craton, Canada

Details Heat production and heat flow in the mantle lithosphere, Slave craton, Canada Heat production and heat flow in the mantle lithosphere, Slave craton, Canada

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pepi..123...27r&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 123, Issue 1, p. 27-44.

Physics

17

Scientific paper

Thermobarometric data for mantle xenoliths from a kimberlite pipe in the NWT, Canada are used to constrain the thermal properties of the lithospheric mantle underlying the Slave craton. We derive an analytical expression for a steady-state conductive mantle geotherm that is independent of the geometry and thermal properties of the crust. The model has an upper boundary coincident with the MOHO at a depth Zm and has temperature Tm and heat flow qm. The mantle is assumed to have constant radiogenic heat production (A) and we allow for a temperature-dependent thermal conductivity [K(T)=Ko(1+B(T-Tm))]. Inverting the thermobarometric data through the model geotherm gives limiting values for mantle heat production (A) and bounds on the temperature dependence of K (e.g. B) that are consistent with the mantle P-T array. We characterize the Slave lithospheric mantle in terms of three critical parameters qm (mWm-2), A (μWm-3), Tm (°C). The optimal solution has values [15.1, 0.012, 455]. This characterization of thermal state of the Slave mantle is based mainly on petrological data and is not biased by assumptions about crustal thermal properties. Our analysis shows that a substantial range of parameter values can be used to describe the data accurately and the two bounding solutions are [24.2, 0.088, 296] and [12.3, 0, 534], respectively. However, model parameters are strongly correlated and this precludes the arbitrary selection of values of [qm, A, Tm] from these ranges.

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