Abstract
Elephant Island, located in the vicinity of the present-day active boundary of the South Shetland Block and the Antarctic and Scotia plates, is a region of particular interest for understanding the past and present geodynamic evolution of the southern Scotia Arc. Lineament from different data sources, field-measured fractures and geomorphological evidences have been analysed in this context. The lineaments extracted from aerial photographs (1,624), from a DEM (348) and from RADARSAT-2 satellite data (1,365) indicate four dominant lineament sets with NE–SW, NW–SE, N–S and W–E strikes. All data sources identified similar lineament families, but differences in the frequency distributions and subsequently on the dominant orientations were observed. The measurements direct of fractures were obtained from 23 sites in the field at which 278 planes were measured. Fracture planes indicate main modes trending in the NNE–SSW and NNW–SSE directions and a secondary mode in the E–W. The major trends of the fracture measurements and the lineaments display a good correlation in the E–W direction. However, there is an angular variation in the azimuth values of the NNE–SSE and NNW–SSE fractures with respect to the N–S, NE–SW and NW–SE orientations of the lineaments of approximately 20°. This trend deviation may be due to the fact that mapped lineaments are composed of small fracture sets that may be related to shear fractures that cannot be distinguished at the aerial photograph or radar satellite data scales. Submerged sea-floor morphological feature orientations match the studied morphostructures on the island and the main tectonic structures in this part of the Scotia Arc. A linkage of the main lineament families to the tectonic stages from the Oligocene to the present has been proposed, taking into account the information of the orientation and sense of movement of the fractures and stresses in the Elephant Island region.
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Acknowledgments
This work was funded by the projects CTM2011-26372, CTM2011-30241-CO2-02 and CTM2011-13902-E of the Spanish R&D National Plan. RADARSAT-2 Science and Operational Applications Research Program (SOAR), Canada provided satellite data through the SOAR-1376 and SOAR-5169 projects granted to the Universidad Autónoma de Madrid, Spain. Topographic and geodetic work was conducted in collaboration with the Centro Geográfico del Ejército, Spain, which we thank. The field campaign was performed in collaboration with the scientists of the Universidade Federal de Rio de Janeiro. In addition, we thank the Brazilian Antarctic Programme for their support. The authors thank the constructive comments of two referees and the editor that have improved the manuscript.
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Mink, S., Maestro, A., López-Martínez, J. et al. Morphostructural analysis and Cenozoic evolution of Elephant Island, Southern Scotia Arc, Antarctica. Int J Earth Sci (Geol Rundsch) 104, 833–851 (2015). https://doi.org/10.1007/s00531-014-1099-1
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DOI: https://doi.org/10.1007/s00531-014-1099-1