Granite formation: Stepwise accumulation of melt or connected networks?
Published:October 01, 2010
Paul D. Bons, Jens K. Becker, Marlina A. Elburg, Kristjan Urtson, 2010. "Granite formation: Stepwise accumulation of melt or connected networks?", Sixth Hutton Symposium on The Origin of Granites and Related Rocks: Proceedings of a Symposium held in Stellenbosch, South Africa, 2- 6 July 2007, John D. Clemens, Colin Donaldson, Carol D. Frost, Alexander F.M. Kisters, Jean-François Moyen, Tracy Rushmer, Gary Stevens
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Several authors have proposed that granitic melt accumulation and transport from the source region occurs in networks of connected melt-filled veins and dykes. These models envisage the smallest leucosomes as ‘rivulets’ that connect to feed larger dykes that form the ‘rivers’ through which magma ascends through the sub-solidus crust. This paper critically reviews this ‘rivulets-feeding-rivers’ model. It is argued that such melt-filled networks are unlikely to develop in nature, because melt flows and accumulates well before a fully connected network can be established. In the alternative stepwise accumulation model, flow and accumulation is transient in both space and time. Observations...