Physics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..59..288r&link_type=abstract
Earth and Planetary Science Letters, Volume 59, Issue 2, p. 288-302.
Physics
16
Scientific paper
Extensive use of empirical heat flow/age relations in the field of thermal studies indicates that the basic concept of a relation between heat flow and age is deeply entrenched. The idea of a thermal time constant and thermal thickness for the lithosphere depends on the validity of a heat flow/age relation. Several thermal and thermo-mechanical lithospheric models are constrained by a heat flow/age relation, a corrected heat flow/age relation, or a reduced heat flow/age relation. The theory of plate tectonics provides a physical basis for a heat flow/age relation for the oceans. Reliable heat flow measurements from well-sedimented areas of the oceans are known to support it. On the contrary, the theory of plate tectonics does not support an age relation for the continents, which is not well realized. It is pointed out that according to the theory of plate tectonics, a distinct heat flow profile should characterize a Cenozoic/Mesozoic orogenic belt over the continents, and a variety of profiles could be expected on account of several possible interactions at convergent plate boundaries. A specific characteristic heat flow value corresponding to a particular age loses meaning, and therefore a heat flow/age relation (or curve) becomes conceptually invalid. Presently available continental heat flow data, statistically analysed in a proper manner, do not (as they should not) support an age relation. Attempts at correcting age-dependent heat flow means for crustal radiogenic heat to obtain an age relation for mantle heat flow do not yield meaningful results.
Rao G. V.
Rao U. M. R.
Reddy G. K.
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