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The fracture system and the melt emplacement beneath the Deception Island active volcano, South Shetland Islands, Antarctica

Published online by Cambridge University Press:  28 October 2011

Antonio Pedrera ,
Ana Ruiz-Constán ,
Nemesio Heredia ,
Jesús Galindo-Zaldívar ,
Fernando Bohoyo ,
Carlos Marín-Lechado ,
Patricia Ruano  and
Luis Somoza
Antonio Pedrera*
Affiliation:
Instituto Geológico y Minero de España, Rios Rosas 23, 28003 Madrid, Spain
Ana Ruiz-Constán
Affiliation:
Departamento de Geodinámica, Universidad de Granada, 18071 Granada, Spain
Nemesio Heredia
Affiliation:
Instituto Geológico y Minero de España, Rios Rosas 23, 28003 Madrid, Spain
Jesús Galindo-Zaldívar
Affiliation:
Departamento de Geodinámica, Universidad de Granada, 18071 Granada, Spain Instituto Andaluz de Ciencias de la Tierra, (CSIC-Univ. Granada), 18071 Granada, Spain
Fernando Bohoyo
Affiliation:
Instituto Geológico y Minero de España, Rios Rosas 23, 28003 Madrid, Spain
Carlos Marín-Lechado
Affiliation:
Instituto Geológico y Minero de España, Rios Rosas 23, 28003 Madrid, Spain
Patricia Ruano
Affiliation:
Departamento de Geodinámica, Universidad de Granada, 18071 Granada, Spain Instituto Andaluz de Ciencias de la Tierra, (CSIC-Univ. Granada), 18071 Granada, Spain
Luis Somoza
Affiliation:
Instituto Geológico y Minero de España, Rios Rosas 23, 28003 Madrid, Spain
*
a.pedrera@igme.es
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Abstract

A new magnetotelluric (MT) survey, along with new topographic parametric sonar (TOPAS) profiles and geological field observations, were carried out on the Deception Island active volcano. 3-D resistivity models reveal an ENE–WSW elongated conductor located at a depth between two and ten kilometres beneath the south-eastern part of the island, which we interpret as a combination of partial melt and hot fluids. The emplacement of the melt in the upper crust occurs along the ENE–WSW oriented, SSE dipping regional normal fault zone, which facilitates melt intrusion at shallower levels with volcanic eruptions and associated seismicity. Most of the onshore and offshore volcanic rocks are deformed by high-angle normal and sub-vertical faults with dominant dip-slip kinematics, distributed in sets roughly parallel and orthogonal to the major ENE–WSW regional tectonic trends. Faults development is related to perturbations of the regional stress field associated with magma chamber overpressure and deflation in a regional setting dominated by NW–SE to NNW–SSE extension.

Keywords

Bransfield Straitfaultsmagnetotelluricstress field
Type
Biological Sciences
Information
Antarctic Science , Volume 24 , Issue 2 , 28 February 2012 , pp. 173 - 182
Copyright
Copyright © Antarctic Science Ltd 2011

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