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GEOTHERM: a finite difference code for testing metamorphic P–T–t paths and tectonic models

Casini, Leonardo and Puccini, Antonio and Cuccuru, Stefano and Maino, Matteo and Oggiano, Giacomo (2014) GEOTHERM: a finite difference code for testing metamorphic P–T–t paths and tectonic models. Computers & Geosciences, Vol. 59 , p. 171-180. ISSN 0098-3004. eISSN 1873-7803. Article.

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DOI: 10.1016/j.cageo.2013.05.017

Abstract

Here, time-dependent solutions for the heat conduction equation are numerically evaluated in 1 D space using a fully implicit algorithm based on the finite difference method, assuming temperature-dependence of thermal conductivity. The method is implemented using the package ‘GEOTHERM’, comprising 13 MATLAB-derived scripts and 3 Excel spreadsheets. In the package, the initial state of the modeled crust, including its thickness, average density, and average heat production rate, can be configured by the user. The exhumation/burial history and metamorphic evolution of the crust are simulated by changing these initial values to fit the vertical displacement rates of the crust imposed by the user. Once the inputs have been made, the variations with depth of temperature, proportion of melt, and shear stress, as well as average values of heat flow at the surface and across the Moho, are calculated and displayed in five separate plots. The code is demonstrated with respect to the Carboniferous evolution of the South Variscan Belt. The best fit to independent petrologic constraints derived from thermobarometry is obtained with an early Carboniferous(342 Ma) slab break-off and a shear strain rate of 10−13 s−1 between 318 and 305 Ma.

Item Type:Article
ID Code:9901
Status:Published
Refereed:Yes
Uncontrolled Keywords:Numerical modeling, finite differences methods, Variscan, HT metamorphism, P–T–t paths
Subjects:Area 04 - Scienze della terra > GEO/03 Geologia strutturale
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze della Natura e del Territorio
Publisher:Elsevier
ISSN:0098-3004
eISSN:1873-7803
Deposited On:23 Jun 2014 12:48

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