The central Fuegian fold and thrust belt in Tierra del Fuego: Strike‐slip tectonics superimposed onto compressional deformation

The boundary between South America and Scotia plates was established during Neogene times when a wrench tectonic regime was developed along the central area of Tierra del Fuego. This boundary includes the Magallanes–Fagnano fault system: a regional diffuse deformation zone, which involves the develo...

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Bibliographic Details
Published in:Geological journal (Chichester, England) England), 2020-09, Vol.55 (9), p.6079-6097
Main Authors: Lozano, Jorge G., Bran, Donaldo M., Peroni, Javier I., Lodolo, Emanuele, Menichetti, Marco, Cerredo, María E., Tassone, Alejandro
Format: Article
Language:English
Subjects:
Basins
Belts
Block diagrams
Deformation
Fault zones
Fuegian Andes
Geological faults
Geophysical data
Gravity
gravity anomaly
Isotopes
Magallanes–Fagnano fault system
Magnetic anomalies
magnetic anomaly
Mountains
Neogene
Paleogene
Plate boundaries
Regional analysis
Regional development
Seismic analysis
Tectonics
Yehuin–Chepelmut fault zone
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Summary:The boundary between South America and Scotia plates was established during Neogene times when a wrench tectonic regime was developed along the central area of Tierra del Fuego. This boundary includes the Magallanes–Fagnano fault system: a regional diffuse deformation zone, which involves the development of the satellite Yehuin–Chepelmut fault zone and a series of pull‐apart basins overprinting the Fuegian fold and thrust belt. The analysis of regional seismic lines allowed to reconstruct and recognize the structure of the external fold and thrust belt. The interpreted structures were integrated into a regional transect and a 3D block diagram that display the different structural domains and, mainly, the wrench deformation associated with the Magallanes–Fagnano fault system. Geophysical data from gravity and magnetic anomaly maps provided further support for the location and development of the pull‐apart basins along the plate boundary. The deformation of the external fold and thrust belt is characterized by an imbricated fan system with a Paleogene detachment surface, which was later cut across by the Yehuin–Chepelmut fault zone and the Magallanes–Fagnano fault system.
ISSN:0072-1050
1099-1034
DOI:10.1002/gj.3764