Evolution of the stress field in the southern Scotia Arc from the late Mesozoic to the present-day

Maestro, Adolfo; López-Martı́nez, Jerónimo; Galindo-Zaldı́var, Jesús; Bohoyo, Fernando; Mink, Sandra

doi:10.1016/j.gloplacha.2014.07.023

Cited by 7 publications

(2 citation statements)

References 85 publications

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“…The main geological structures and brittle deformation record in the western Scotia Arc reveal a complex geological history since the Mesozoic, which includes transform, convergent and divergent tectonic settings, and shows a regional NE-SW compression and a NW-SE extension regime at the present day (Bohoyo et al, 2007;Galindo-Zaldívar, Jabaloy, Maldonado, & Sanz de Galdeano, 1996;Maestro, López-Martínez, Galindo-Zaldívar, Bohoyo, & Mink, 2014).…”

Section: Geological Settingmentioning

confidence: 99%

Morphological and geological features of Drake Passage, Antarctica, from a new digital bathymetric model

et al. 2019

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The Drake Passage is an oceanic gateway of about 850 km width located between South America and the Antarctic Peninsula that connects the southeastern Pacific Ocean with the southwestern Atlantic Ocean. It is an important gateway for mantle flow, oceanographic water masses, and migrations of biota. This sector developed within the framework of the geodynamic evolution of the Scotia Arc, including continental fragmentation processes and oceanic crust creation, since the oblique divergence of the South American plate to the north and the Antarctic plate to the south started in the Eocene. As a consequence of its complex tectonic evolution and subsequent submarine processes, as sedimentary infill and erosion mainly controlled by bottom currents and active tectonics, this region shows a varied physiography. We present a detailed map of the bathymetry and geological setting of the Drake Passage that is mainly founded on a new compilation of precise multibeam bathymetric data obtained on 120 cruises between 1992 and 2015, resulting in a new Digital Bathymetric Model with 200 × 200 m cell spacing. The map covers an area of 1,465,000 km 2 between parallels 52°S and 63°S and meridians 70°W and 50°W at scale 1:1,600,000 allowing the identification of the main seafloor features. In addition, the map includes useful geological information related to magnetism, seismicity and tectonics. This work constitutes an international cooperative effort and is part of the International Bathymetric Chart of the Southern Ocean project, under the Scientific Committee on Antarctic Research umbrella.

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Section: Geological Settingmentioning

confidence: 99%

Morphological and geological features of Drake Passage, Antarctica, from a new digital bathymetric model

et al. 2019

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“…If we assume that the stress field remains constant over a particular time interval, it is therefore necessary to provide a sufficiently large data set to be able to detect orientation variations at the regional scale. The variations may be related to diverse tectonic states over time or to the activity of large faults (Armijo et al, ; Casas & Maestro, ; Maestro et al, ; Maestro & López‐Martínez, ; Simón, , ; Tapponier & Molnar, ). The relationship between the activity of large faults and the deflection of stress trajectories has been studied through mathematical means and analog models (e.g., Casas et al, , and references herein).…”

Section: Introductionmentioning

confidence: 99%

Stress Field Evolution of the Southernmost Andean Cordillera From Paleostress Analysis (Argentine Tierra del Fuego)

et al. 2019

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The Argentine Tierra del Fuego comprises part of the roughly east-west trending southern end of the Andean Cordillera intensely deformed since the Mesozoic. Mesostructures have been measured in Late Jurassic to Miocene rocks. Taking into account statistical criteria to provide a representative stress tensor from a fault population, this study defines 28 paleostress tensors pertaining to 22 sites. The orientation of σ 1 shows two main modes trending E-W to ESE-WNW and NE-SW. In addition, extensional sites reveal N-S, NE-SW, ESE-WNW, and NW-SE horizontal σ 3 and vertical σ 1 . The stress fields obtained are congruous with a regional NE-SW compressive stress direction active in the study zone since the Late Cretaceous. Shortening was coeval with a 30°counterclockwise rotation of the Patagonian orogenic curve and the indentation of the orogenic wedge against a basement high, the Río Chico Arch, up to the early Miocene. The indentation caused a modification in the orientation of the compressive stress trajectories, showing NE-SW direction in Sorondo Range sector and NW-SE in Mitre Peninsula area. Since the late Miocene, left-lateral activity along the Magallanes-Fagnano Fault System produced local deviations of the NE-SW compressive stress toward an E-W direction. The present-day stress field is also characterized by NE-SW subhorizontal P axis derived from earthquake focal mechanisms and geodetic studies.

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Oceanographic and climatic consequences of the tectonic evolution of the southern scotia sea basins, Antarctica

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Hernández-Molina

Lodolo

et al. 2019

Earth-Science Reviews

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Evolution of the stress field in the southern Scotia Arc from the late Mesozoic to the present-day

Cited by 7 publications

References 85 publications

Morphological and geological features of Drake Passage, Antarctica, from a new digital bathymetric model

Morphological and geological features of Drake Passage, Antarctica, from a new digital bathymetric model

Stress Field Evolution of the Southernmost Andean Cordillera From Paleostress Analysis (Argentine Tierra del Fuego)

Oceanographic and climatic consequences of the tectonic evolution of the southern scotia sea basins, Antarctica

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