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

PERONI, JAVIER I.; CERREDO, MARÍA E.; BRAN, DONALDO M.; MENICHETTI, MARCO; LOZANO, JORGE G.; LODOLO, EMANUELE; TASSONE, ALEJANDRO

GEOLOGICAL JOURNAL (CHICHESTER)

JOHN WILEY & SONS LTD

Lugar: LOndres; Año: 2020 p. 1 - 19

0072-1050

The boundary between South America and Scotia plates was established during Neogenetimes 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 reconstructand recognize the structure of the external fold and thrust belt. The interpretedstructures were integrated into a regional transect and a 3D block diagram that displaythe different structural domains and, mainly, the wrench deformation associatedwith the Magallanes?Fagnano fault system. Geophysical data from gravity and magneticanomaly 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 detachmentsurface, which was later cut across by the Yehuin?Chepelmut fault zone andthe Magallanes?Fagnano fault system.