Gelatine as a crustal analogue: Determining elastic properties for modelling magmatic intrusions

Kavanagh, J. L. and Menand, T. and Daniels, K. A. (2013) Gelatine as a crustal analogue: Determining elastic properties for modelling magmatic intrusions. Tectonophysics, 582. pp. 101-111. ISSN 0040-1951 DOI

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Gelatine has often been used as an analogue material to model the propagation of magma-filled fractures in the Earth's brittle and elastic crust. Despite this, there are few studies of the elastic properties of gelatine and how these evolve with time. This important information is required to ensure proper scaling of experiments using gelatine. Gelatine is a viscoelastic material, but at cool temperatures (Tr ~ 5–10 °C) it is in the solid ‘gel’ state where the elastic behaviour dominates and the viscous component is negligible over short to moderate timescales. We present results from a series of experiments on up to 30 litres of maximum 30 wt.% pigskin gelatine mixtures that document in detail how the elastic properties evolve with time, as a function of the volume used and gel concentration (Cgel). Gelatine's fracture toughness is investigated by measuring the pressure required to propagate a pre-existing crack. In the gel-state, gelatine's Young's modulus can be calculated by measuring the deflection to the free-surface caused by an applied load. The load's geometry can affect the Young's modulus measurement; our results show its diameter needs to be ≲ 10% of both the container diameter and the gelatine thickness (Hgel) for side-wall and base effects to be ignored. Gelatine's Young's modulus increases exponentially with time, reaching a plateau (E∞) after several hours curing. E∞ depends linearly on Cgel, while Tr, Hgel and the gelatine's thermal diffusivity control the time required to reach this value. Gelatine's fracture toughness follows the same relationship as ideal elastic-brittle solids with a calculated surface energy γs = 1.0 ± 0.2 J m− 2. Scaling laws for gelatine as a crustal analogue intruded by magma (dykes or sills) show that mixtures of 2–5 wt.% gelatine cured at ~ 5–10 °C ensure the experiments are geometrically, kinematically and dynamically scaled.

Item Type: Article
Uncontrolled Keywords: NIL AREP; IA66;
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Tectonophysics
Volume: 582
Page Range: pp. 101-111
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 30 Aug 2013 18:11
Last Modified: 02 Sep 2013 13:24

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