The boundary between South America and Scotia plates was established during Neo-gene times when a wrench tectonic regime was developed along the central area ofTierra del Fuego. This boundary includes the Magallanes–Fagnano fault system: aregional diffuse deformation zone, which involves the development of the satelliteYehuin–Chepelmut fault zone and a series of pull-apart basins overprinting theFuegian fold and thrust belt. The analysis of regional seismic lines allowed to recon-struct and recognize the structure of the external fold and thrust belt. The interpretedstructures were integrated into a regional transect and a 3D block diagram that dis-play the different structural domains and, mainly, the wrench deformation associatedwith the Magallanes–Fagnano fault system. Geophysical data from gravity and mag-netic anomaly maps provided further support for the location and development ofthe pull-apart basins along the plate boundary. The deformation of the external foldand thrust belt is characterized by an imbricated fan system with a Paleogene detach-ment surface, which was later cut across by the Yehuin–Chepelmut fault zone andthe Magallanes–Fagnano fault system

The central Fuegian fold and thrust belt in Tierra del Fuego:Strike-slip tectonics superimposed onto compressionaldeformation

Marco Menichetti;
2020

Abstract

The boundary between South America and Scotia plates was established during Neo-gene times when a wrench tectonic regime was developed along the central area ofTierra del Fuego. This boundary includes the Magallanes–Fagnano fault system: aregional diffuse deformation zone, which involves the development of the satelliteYehuin–Chepelmut fault zone and a series of pull-apart basins overprinting theFuegian fold and thrust belt. The analysis of regional seismic lines allowed to recon-struct and recognize the structure of the external fold and thrust belt. The interpretedstructures were integrated into a regional transect and a 3D block diagram that dis-play the different structural domains and, mainly, the wrench deformation associatedwith the Magallanes–Fagnano fault system. Geophysical data from gravity and mag-netic anomaly maps provided further support for the location and development ofthe pull-apart basins along the plate boundary. The deformation of the external foldand thrust belt is characterized by an imbricated fan system with a Paleogene detach-ment surface, which was later cut across by the Yehuin–Chepelmut fault zone andthe Magallanes–Fagnano fault system
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11576/2726489
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