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Upper crustal structure of Deception Island area (Bransfield Strait, Antarctica) from gravity and magnetic modelling

Muñoz Martín, Alfonso and Catalán Morollón, Manuel and Martín Dávila, José and Carbó Gorosabel, Andrés (2005) Upper crustal structure of Deception Island area (Bransfield Strait, Antarctica) from gravity and magnetic modelling. Antarctic Science, 17 (2). pp. 213-224. ISSN 0954-1020

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Abstract

Deception Island is a young, active volcano located in the south-western part of Bransfield Strait, between the Antarctic Peninsula and the South Shetland archipelago. New gravity and magnetic data, from a
marine geophysical cruise (DECVOL-99), were analysed. Forty-eight survey lines were processed and mapped around Deception Island to obtain Bouguer and magnetic anomaly maps. These maps show welldefined groups of gravity and magnetic anomalies, as well as their gradients. To constrain the upper crustal structure, we have performed 2+1/2D forward modelling on three profiles perpendicular to the main anomalies of the area, and taking into account previously published seismic information. From the gravity and magnetic models, two types of crust were identified. These were interpreted as continental crust (located north of Deception Island) and more basic crust (south of Deception Island). The transition between these crustal types is evident in the Bouguer anomaly map as a high gradient area trending NE–SW. Both magnetic and gravity data show a wide minimum at the eastern part of Deception Island, which suggests a very low bulk susceptibility and low density intrusive body. With historical recorded eruptions and thermal and fumarolic fields, we interpret this anomaly as a partially melted intrusive body. Its top has been estimated to be at 1.7 km depth using Euler deconvolution techniques.


Item Type:Article
Uncontrolled Keywords:Euler deconvolution; Gravity and magnetic anomalies; Marine survey; Potential field modelling
Subjects:Sciences > Geology > Geodynamics
ID Code:5897
Deposited On:03 Oct 2006
Last Modified:06 Feb 2014 07:46

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