The Fourth Hutton Symposium on the Origin of Granites and Related Rocks
Analogue scale models of pluton emplacement during transpression in brittle and ductile crust
Published:January 01, 2000
Keith Benn, Francis Odonne, Sharon K. Y. Lee, Ken Darcovich, 2000. "Analogue scale models of pluton emplacement during transpression in brittle and ductile crust", The Fourth Hutton Symposium on the Origin of Granites and Related Rocks, Bernard Barbarin, William Edryd Stephens, Bernard Bonin, Jean-Luc Bouchez, David Barrie Clarke, Michel Cuney, Hervé Martin
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Analogue experiments were used to investigate pluton emplacement during transpression in a layered crust. Models consisted of (1) a silicone gum-PbO suspension as analogue magma, (2) a silicone gum-Pb suspension as a basal ductile layer, and (3) an overlying sand pack representing brittle crust. The models were transpressed at 3 mm/hr causing the extrusion of the analogue magma from a progressively closing slot, and its emplacement into the ductile layer. The thicknesses of the layers were critical in controlling the shapes of intrusions and the structures that developed in the brittle overburden. Thicker sand packs led to flattened, symmetrical laccolith-shaped...