Abstract
The crystallization history of magma chambers is intimately coupled to the heat transfer systematics of the surrounding wall rock. In this paper we investigate the thermal interaction between magmatic and hydrothermal convection. Two models of magmatic convection are addressed: compositionally and thermally dominated flow both driven by heat loss to a hydrotherm7al system. For compositionally driven flow in a porous medium the temperature along the wall rock-magma interface is found to be a weighted constant. For thermally driven flow temperatures are found to increase upward along the intrusive contact The steady state thickness of the solid grown into the magma chamber was found to be O(10m) for siliceous melts and O(.01m) for basic melts, the difference in these values being a direct result of their differing viscosities. These models suggest that hydrothermal circulation can effectively quench the interface at the intrusive contact, particularily for siliceous magmas. The high temperatures recorded in the hydrothermally altered country rock near intrusions either record a short lived transient condition or the passage of fluids which have been in intimate contact with the magma.
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© 1987 Martinus Nijhoff Publishers, Dordrecht
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Bergantz, G.W., Lowell, R.P. (1987). The Role of Conjugate Convection in Magmatic Heat and Mass Transfer. In: Loper, D.E. (eds) Structure and Dynamics of Partially Solidified Systems. NATO ASI Series, vol 125. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3587-7_17
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DOI: https://doi.org/10.1007/978-94-009-3587-7_17
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