RT Journal Article
T1 Upper crustal structure of Deception Island area (Bransfield Strait, Antarctica) from gravity and magnetic modelling
A1 Muñoz Martín, Alfonso
A1 Catalán Morollón, Manuel
A1 Martín Dávila, José
A1 Carbo Gorosabel, Andrés
AB 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 amarine 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.
SN 0954-1020
YR 2005
FD 2005
LK https://hdl.handle.net/20.500.14352/52387
UL https://hdl.handle.net/20.500.14352/52387
LA spa
DS Docta Complutense
RD 7 abr 2025