Computer Science
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..93..392a&link_type=abstract
Earth and Planetary Science Letters, Volume 93, Issue 3-4, p. 392-404.
Computer Science
4
Scientific paper
Bodies of rock within the crust that have higher thermal conductivities than surrounding rocks serve as conduits for the diffusive flow of heat. The resultant focusing of heat creates an apparent ``contact metamorphic aureole'' in the surrounding rocks, without the high-conductivity rocks being a heat source themselves. Two-dimensional thermal models of mantled gneiss domes are used to consider these effects, and their role in the thermal histories of metamorphic belts. The complex metamorphic histories and patterns observed around gneiss domes may be the result of the emplacement of relatively high thermal conductivity rocks (dome cores) into lower thermal conductivity metasediments (mantling strata). The degree of the thermal anomaly is primarily affected by the conductivity contrast, but is also dependent upon the velocity of emplacement, crustal level, and heat flux. Many of the metamorphic isograd features and pressure-temperature-time paths that are observed around mantled gneiss domes can be explained merely by the emplacement of high-conductivity rocks into low-conductivity rocks without invoking additional heat sources or significant post-metamorphic deformation.
Allen Tim
Chamberlain Page C.
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