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Book Chapter

Experiments on granite intrusion in transtension

By
T. Román-Berdiel
T. Román-Berdiel
Departamento de Geodinámica, Universidad del Pais VascoApartado 644, 48080 Bilbao, Spainacasas@posta.unizar.es
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A. Aranguren
A. Aranguren
Departamento de Geodinámica, Universidad del Pais VascoApartado 644, 48080 Bilbao, Spainacasas@posta.unizar.es
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J. Cuevas
J. Cuevas
Departamento de Geodinámica, Universidad del Pais VascoApartado 644, 48080 Bilbao, Spainacasas@posta.unizar.es
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J. M. Tubía
J. M. Tubía
Departamento de Geodinámica, Universidad del Pais VascoApartado 644, 48080 Bilbao, Spainacasas@posta.unizar.es
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D. Gapais
D. Gapais
Géosciences Rennes (UPR 4661, CNRS)Université de Rennes 1, 35042 Rennes Cédex, France
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J.-P. Brun
J.-P. Brun
Géosciences Rennes (UPR 4661, CNRS)Université de Rennes 1, 35042 Rennes Cédex, France
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Published:
January 01, 1999

Abstract

Granite intrusion in transtensional regime is modelled by injecting a Newtonian fluid into a sand pack containing a ductile layer. The transtensional regime is obtained using two plastic sheets sliding along two rigid horizontal plates, and diverging from two narrow spaces (two fixed velocity discontinuities). The injection tube is located in a central space between these plates. Both symmetric experiments (when the two sheets were displaced with equal and opposite velocity vectors) and asymmetric experiments (in which only one sheet was displaced) were performed. Transtension was applied with a systematic variation (every 15°) of the divergence angle (α), between 15° and 90°. Experiments showed that: intrusions localize strain from the first stages of deformation; intrusions result in partially conformable laccoliths with bowler-hat geometry in cross-section; intrusions show an important offset towards the mobile basal plate for asymmetric transtensional regime, and are more symmetric and centred on the injection point for symmetric transtensional regime; the geometry of intrusions is controlled by the faults developed in the overburden. The significance of this control depends upon the angle of divergence α. Examples of the Hombreiro and Los Pedroches granites of the Variscan belt of Spain have been addressed to test the applicability of these experimental results.

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Contents

Geological Society, London, Special Publications

Salt, Shale and Igneous Diapirs in and around Europe

Bruno C. Vendeville
Bruno C. Vendeville
University of Texas, USA
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Yossi Mart
Yossi Mart
University of Haifa, Israel
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Jean-Louis Vigneresse
Jean-Louis Vigneresse
Université Nancy, France
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Geological Society of London
Volume
174
ISBN electronic:
9781862394223
Publication date:
January 01, 1999

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