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

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 b...

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Bibliographic Details
Published in:Antarctic Science
Main Authors: Pedrera Parias, Antonio, Ruiz Constán, Ana, Heredia, N., Galindo Zaldívar, Jesús, Bohoyo, Fernando, Marín Lechado, Carlos, Ruano, Patricia, Somoza, Luis
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press 2011
Subjects:
Estrecho de Bransfield
fault
magnetotelluric
stress field
Isla Decepción
Antártida
materia fundida
Bransfield Isla
Deception Island
Estrecho
isla Decepción
South Shetland Islands
Antarc*
Antarctic Science
Antarctica
Online Access:http://hdl.handle.net/10261/277025
https://doi.org/10.1017/S0954102011000794
Description
Summary: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 Instituto Geológico y Minero de España, España Departamento de Geodinámica, Universidad de Granada, España Instituto Andaluz de Ciencias de la Tierra, Consejo Superior de Investigaciones Científicas, España Instituto Andaluz de Ciencias de la Tierra, Universidad de Granada, España

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