Antarctic/Scotia plate convergence off southernmost Chile
The southern tip of South America off Chile has suffered a long phase of ocean-continent convergence which has shaped the continental margin through different phases of accretion and tectonic erosion. The present accretionary wedge is a discontinuous geological record of plate convergence and record...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2007
|
Subjects: | |
Online Access: | https://ddd.uab.cat/record/85961 |
id |
ftuabarcelonapb:oai:ddd.uab.cat:85961 |
---|---|
record_format |
openpolar |
spelling |
ftuabarcelonapb:oai:ddd.uab.cat:85961 2024-04-21T07:48:20+00:00 Antarctic/Scotia plate convergence off southernmost Chile Polonia, Alina Torelli, Luigi 2007 application/pdf https://ddd.uab.cat/record/85961 eng eng Geologica acta Vol. 5, Núm. 4 (2007), p. 295-306 https://ddd.uab.cat/record/85961 urn:10.1344/105.000000290 urn:oai:ddd.uab.cat:85961 urn:articleid:16965728v5n4p295 urn:oai:raco.cat:article/82437 urn:oai:revistes.ub.edu:article/1911 open access Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria de l'obra original. https://creativecommons.org/licenses/by-sa/3.0/ Plate tectonics Continental margin Trench Subduction complex Tectonic accretion Marine geology Article 2007 ftuabarcelonapb 2024-03-26T09:32:44Z The southern tip of South America off Chile has suffered a long phase of ocean-continent convergence which has shaped the continental margin through different phases of accretion and tectonic erosion. The present accretionary wedge is a discontinuous geological record of plate convergence and records only part of the accretionary processes resumed after Chile ridge consumption (14 Ma). The structural style of the subduction complex, such as rates of sediment accretion and tectonic erosion, structural vergence, width of the accretionary wedge, taper angle and deformation in the forearc basin, varies along the margin. Large taper values are related to narrow wedges and seaward vergent structures. Low tapers occur where deformation at the toe of the accretionary complex is spread over wide areas and is related both to landward and seaward vergent thrust faults. Seismic data interpretation contributes to define more accurately frontal wedge morphology and geometry of subduction and suggests that different modes of accretion together with tectonic erosion may be active concurrently along the trench at different locations. In areas of subduction driven accretionary processes the majority of trench sediments are involved in accretionary processes and sediments are uplifted and piled up in the form of imbricate thrust sheets. In areas where the wedge is non-accretionary the continental margin shows steeper continental slopes associated with narrow accretionary wedges, more intense sediment disruption and very shallow décollement levels. Variation in structural style and in the geometry of the forearc region setting off Southernmost Chile, has been interpreted as related to the existence of different structural domains: the nature of their boundaries is still unclear mainly for the lack of high resolution bathymetric data. They have been tentatively related to tectonic lineaments belonging to the Magellan Fault system and/or to the character and morphology of the converging plates (lateral heterogeneities, sea-mounts ... Article in Journal/Newspaper Antarc* Antarctic Universitat Autònoma de Barcelona: Dipòsit Digital de Documents de la UAB |
institution |
Open Polar |
collection |
Universitat Autònoma de Barcelona: Dipòsit Digital de Documents de la UAB |
op_collection_id |
ftuabarcelonapb |
language |
English |
topic |
Plate tectonics Continental margin Trench Subduction complex Tectonic accretion Marine geology |
spellingShingle |
Plate tectonics Continental margin Trench Subduction complex Tectonic accretion Marine geology Polonia, Alina Torelli, Luigi Antarctic/Scotia plate convergence off southernmost Chile |
topic_facet |
Plate tectonics Continental margin Trench Subduction complex Tectonic accretion Marine geology |
description |
The southern tip of South America off Chile has suffered a long phase of ocean-continent convergence which has shaped the continental margin through different phases of accretion and tectonic erosion. The present accretionary wedge is a discontinuous geological record of plate convergence and records only part of the accretionary processes resumed after Chile ridge consumption (14 Ma). The structural style of the subduction complex, such as rates of sediment accretion and tectonic erosion, structural vergence, width of the accretionary wedge, taper angle and deformation in the forearc basin, varies along the margin. Large taper values are related to narrow wedges and seaward vergent structures. Low tapers occur where deformation at the toe of the accretionary complex is spread over wide areas and is related both to landward and seaward vergent thrust faults. Seismic data interpretation contributes to define more accurately frontal wedge morphology and geometry of subduction and suggests that different modes of accretion together with tectonic erosion may be active concurrently along the trench at different locations. In areas of subduction driven accretionary processes the majority of trench sediments are involved in accretionary processes and sediments are uplifted and piled up in the form of imbricate thrust sheets. In areas where the wedge is non-accretionary the continental margin shows steeper continental slopes associated with narrow accretionary wedges, more intense sediment disruption and very shallow décollement levels. Variation in structural style and in the geometry of the forearc region setting off Southernmost Chile, has been interpreted as related to the existence of different structural domains: the nature of their boundaries is still unclear mainly for the lack of high resolution bathymetric data. They have been tentatively related to tectonic lineaments belonging to the Magellan Fault system and/or to the character and morphology of the converging plates (lateral heterogeneities, sea-mounts ... |
format |
Article in Journal/Newspaper |
author |
Polonia, Alina Torelli, Luigi |
author_facet |
Polonia, Alina Torelli, Luigi |
author_sort |
Polonia, Alina |
title |
Antarctic/Scotia plate convergence off southernmost Chile |
title_short |
Antarctic/Scotia plate convergence off southernmost Chile |
title_full |
Antarctic/Scotia plate convergence off southernmost Chile |
title_fullStr |
Antarctic/Scotia plate convergence off southernmost Chile |
title_full_unstemmed |
Antarctic/Scotia plate convergence off southernmost Chile |
title_sort |
antarctic/scotia plate convergence off southernmost chile |
publishDate |
2007 |
url |
https://ddd.uab.cat/record/85961 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Geologica acta Vol. 5, Núm. 4 (2007), p. 295-306 https://ddd.uab.cat/record/85961 urn:10.1344/105.000000290 urn:oai:ddd.uab.cat:85961 urn:articleid:16965728v5n4p295 urn:oai:raco.cat:article/82437 urn:oai:revistes.ub.edu:article/1911 |
op_rights |
open access Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria de l'obra original. https://creativecommons.org/licenses/by-sa/3.0/ |
_version_ |
1796949120228786176 |