Geotectonic evolution of the Bransfield Basin, Antarctic Peninsula: Insights from analogue models

M. A. Solari, F. Hervé, J. Martinod, J. P. Le Roux, L. E. Ramírez, C. Palacios

Resultado de la investigación: Article

11 Citas (Scopus)

Resumen

The Bransfield Strait, located between the South Shetland Islands and the north-western end of the Antarctic Peninsula, is a back-arc basin transitional between rifting and spreading. We compiled a geomorphological structural map of the Bransfield Basin combining published data and the interpretation of bathymetric images. Several analogue experiments reproducing the interaction between the Scotia, Antarctic, and Phoenix plates were carried out. The fault configuration observed in the geomorphological structural map was well reproduced by one of these analogue models. The results suggest the establishment of a transpressional regime to the west of the southern segment of the Shackleton Fracture Zone and a transtensional regime to the south-west of the South Scotia Ridge by at least c. 7 Ma. A probable mechanism for the opening of the Bransfield Basin requires two processes: 1) Significant transtensional effects in the Bransfield Basin caused by the configuration and drift vector of the Scotia Plate after the activity of the West Scotia Ridge ceased at c. 7 Ma. 2) Roll-back of the Phoenix Plate under the South Shetland Islands after cessation of spreading activity of the Phoenix Ridge at 3.3 ± 0.2 Ma, causing the north-westward migration of the South Shetland Trench.

Idioma originalEnglish
Páginas (desde-hasta)185-196
Número de páginas12
PublicaciónAntarctic Science
Volumen20
N.º2
DOI
EstadoPublished - 1 abr 2008

Huella dactilar

Agrotis
analog model
basins
basin
Antarctica
image interpretation
fracture zone
rifting
trench
strait
experiment

ASJC Scopus subject areas

  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Geology

Citar esto

Solari, M. A. ; Hervé, F. ; Martinod, J. ; Le Roux, J. P. ; Ramírez, L. E. ; Palacios, C. / Geotectonic evolution of the Bransfield Basin, Antarctic Peninsula : Insights from analogue models. En: Antarctic Science. 2008 ; Vol. 20, N.º 2. pp. 185-196.
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Geotectonic evolution of the Bransfield Basin, Antarctic Peninsula : Insights from analogue models. / Solari, M. A.; Hervé, F.; Martinod, J.; Le Roux, J. P.; Ramírez, L. E.; Palacios, C.

En: Antarctic Science, Vol. 20, N.º 2, 01.04.2008, p. 185-196.

Resultado de la investigación: Article

TY - JOUR

T1 - Geotectonic evolution of the Bransfield Basin, Antarctic Peninsula

T2 - Insights from analogue models

AU - Solari, M. A.

AU - Hervé, F.

AU - Martinod, J.

AU - Le Roux, J. P.

AU - Ramírez, L. E.

AU - Palacios, C.

PY - 2008/4/1

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N2 - The Bransfield Strait, located between the South Shetland Islands and the north-western end of the Antarctic Peninsula, is a back-arc basin transitional between rifting and spreading. We compiled a geomorphological structural map of the Bransfield Basin combining published data and the interpretation of bathymetric images. Several analogue experiments reproducing the interaction between the Scotia, Antarctic, and Phoenix plates were carried out. The fault configuration observed in the geomorphological structural map was well reproduced by one of these analogue models. The results suggest the establishment of a transpressional regime to the west of the southern segment of the Shackleton Fracture Zone and a transtensional regime to the south-west of the South Scotia Ridge by at least c. 7 Ma. A probable mechanism for the opening of the Bransfield Basin requires two processes: 1) Significant transtensional effects in the Bransfield Basin caused by the configuration and drift vector of the Scotia Plate after the activity of the West Scotia Ridge ceased at c. 7 Ma. 2) Roll-back of the Phoenix Plate under the South Shetland Islands after cessation of spreading activity of the Phoenix Ridge at 3.3 ± 0.2 Ma, causing the north-westward migration of the South Shetland Trench.

AB - The Bransfield Strait, located between the South Shetland Islands and the north-western end of the Antarctic Peninsula, is a back-arc basin transitional between rifting and spreading. We compiled a geomorphological structural map of the Bransfield Basin combining published data and the interpretation of bathymetric images. Several analogue experiments reproducing the interaction between the Scotia, Antarctic, and Phoenix plates were carried out. The fault configuration observed in the geomorphological structural map was well reproduced by one of these analogue models. The results suggest the establishment of a transpressional regime to the west of the southern segment of the Shackleton Fracture Zone and a transtensional regime to the south-west of the South Scotia Ridge by at least c. 7 Ma. A probable mechanism for the opening of the Bransfield Basin requires two processes: 1) Significant transtensional effects in the Bransfield Basin caused by the configuration and drift vector of the Scotia Plate after the activity of the West Scotia Ridge ceased at c. 7 Ma. 2) Roll-back of the Phoenix Plate under the South Shetland Islands after cessation of spreading activity of the Phoenix Ridge at 3.3 ± 0.2 Ma, causing the north-westward migration of the South Shetland Trench.

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