کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4692526 1636803 2013 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Gelatine as a crustal analogue: Determining elastic properties for modelling magmatic intrusions
ترجمه فارسی عنوان
ژلاتین به عنوان یک آنالوگ پوسته: تعیین خواص الاستیک برای مدل سازی ورودی های ماگمایی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی

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.


► 2–5 wt.% gelatine mixtures at 5–10 °C are good crustal analogues for dyke or sill experiments.
► The Young's modulus of gelatine evolves with time to a plateau.
► This Young's modulus plateau correlates linearly with gelatine concentration.
► The time to plateau depends on the room temperature, gelatine thickness and its thermal diffusivity.
► Gelatine's fracture toughness has a surface energy of γs = 1.0 ± 0.2 Jm− 2.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tectonophysics - Volume 582, 2 January 2013, Pages 101–111
نویسندگان
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