Morfotectónica marina y arquitectura del sistema de fallas Magallanes Fagnano en el estrecho de Magallanes Occidental
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Fecha
2022
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es
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Universidad Andrés Bello
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Licencia CC
Licencia CC
Resumen
Al Sur del continente Sudamericano se desarrolla el sistema de fallas Magallanes Fagnano, el cual
ha sido estudiado en su sección Oriental enfocado principalmente en la geología estructural.
Usando Modelos de elevación digital y perfiles de reflexión sísmica se pudieron obtener evidencias
actividad tectónica de rumbo en la Batimetría en el Estrecho de Magallanes occidental. Se ha
identificado que la zona de deformación presenta segmentos transtensionales del límite
transformante de las placas de Scotia y Sudamérica que constituyen la base neotectónica del
ambiente costero. Los datos de este trabajo para el Estrecho de Magallanes Occidental revelan
geoformas tales como escarpes activos y cuencas pull-apart que aclaran las singularidades
morfoestructurales en la zona de desplazamiento principal y definen la posición de ésta. Una serie
de morfologías glaciales son identificadas en el fondo marino y son evidencias de la evolución
glacial del último periodo y se ven afectados por la deformación del sistema de fallas. Por otro
lado, cuencas pull-apart de carácter asimétrica han sido identificadas a lo largo del segmento
principal y dan cuenta de la componente transtensional que afecta la zona. A partir de estos datos,
zonas de Releasing bend y Restraining bend se han identificado en el Estrecho de Magallanes
occidental logrando esclarecer la evolución tectónica de rumbo la cual ha sido registrada por la
geomorfología del fondo oceánico estableciendo el contexto neotectónico del Sistema de fallas
Magallanes Fagnano.
To the south of the South American continent the Magellan Fagnano fault system is developed, which has been studied in its eastern section focusing mainly on structural geology. Using digital elevation models and seismic reflection profiles it was possible to obtain evidence of strike-slip tectonic activity in the bathymetry in the western Strait of Magellan. It has been identified that the deformation zone presents transtensional segments of the transform boundary of the Scotia and South American plates that constitute the neotectonic basis of the coastal environment. Data from this work for the Western Strait of Magellan reveal geoforms such as active escarpments and pull apart basins that clarify the morphostructural singularities in the main displacement zone and define its position. A series of glacial morphologies are identified on the seafloor and are evidence of the glacial evolution of the last period and are affected by the deformation of the fault system. On the other hand, pull-apart basins of asymmetric character have been identified along the main segment and account for the transtensional component that affects the area. From these data, Releasing bend and Restraining bend zones have been identified in the western Strait of Magellan clarifying the strike-slip tectonic evolution which has been recorded by the geomorphology of the ocean floor establishing the neotectonic context of the Magallanes Fagnano Fault System.
To the south of the South American continent the Magellan Fagnano fault system is developed, which has been studied in its eastern section focusing mainly on structural geology. Using digital elevation models and seismic reflection profiles it was possible to obtain evidence of strike-slip tectonic activity in the bathymetry in the western Strait of Magellan. It has been identified that the deformation zone presents transtensional segments of the transform boundary of the Scotia and South American plates that constitute the neotectonic basis of the coastal environment. Data from this work for the Western Strait of Magellan reveal geoforms such as active escarpments and pull apart basins that clarify the morphostructural singularities in the main displacement zone and define its position. A series of glacial morphologies are identified on the seafloor and are evidence of the glacial evolution of the last period and are affected by the deformation of the fault system. On the other hand, pull-apart basins of asymmetric character have been identified along the main segment and account for the transtensional component that affects the area. From these data, Releasing bend and Restraining bend zones have been identified in the western Strait of Magellan clarifying the strike-slip tectonic evolution which has been recorded by the geomorphology of the ocean floor establishing the neotectonic context of the Magallanes Fagnano Fault System.
Notas
Tesis (Geólogo)
Palabras clave
Zonas de Fallas (Geología), Tectónica de Placas, Chile, Magallanes