Computer Science
Scientific paper
Mar 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006e%26psl.243..786g&link_type=abstract
Earth and Planetary Science Letters, Volume 243, Issue 3-4, p. 786-804.
Computer Science
22
Scientific paper
In the upper crust, intrusive bodies adopt different configurations, depending on the tectonic setting. This paper describes a new technique for analogue modelling of such intrusions, specifically of low-viscosity magma into a deforming brittle crust. Proper dynamic scaling is an important consideration. If the crust has a Coulomb failure envelope, the model material should have a cohesion C of 40 Pa to 7500 Pa. If the intruding magma is highly mobile, the model fluid should have a viscosity of 4 × 10- 9 Pa s to 75 Pa s. For the model crust, we have used crystalline silica powder (SI-CRYSTAL), siliceous microspheres (SI-SPHERE) of grain size < 30 μm, and a mixture (SI-MIX) of both materials. The mechanical properties of these powders have been obtained by shear and tension shear tests. SI-CRYSTAL powder is cohesive (C ≈ 300 Pa, angle of internal friction ϕ ≈ 45°) and represents competent rock. SI-SPHERE powder is much less cohesive (C ≈ 10 Pa, ϕ ≈ 25°) and represents incompetent rock. SI-MIX has intermediate properties. The model magma is a vegetable oil, which solidifies at room temperature. Its viscosity when molten is η = 2 × 10- 2 Pa s at 50 °C. Using these materials, we have done some preliminary experiments, to investigate the intrusion of low-viscosity magma into sedimentary basins. In non-deformed settings, intrusions were saucer-shaped cone sheets. In horizontal extension, they were steep dykes. Finally, in horizontal shortening, intrusions were basal sills that branched into thrust faults.
Cobbold Peter R.
de Bremond D'Ars Jean
Delavaud Gatien
Galland Olivier
Hallot Erwan
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