Tectonic evolution of northern Antarctic Peninsula from brittle mesostructures and earthquake focal mechanisms
Summary Paleostress results derived from brittle mesoscopic structures at locations on the South Shetland Islands, Antarctic Peninsula and Seymour Island and from focal mechanism analysis show a stress field characterized by both extensional and compressional regimes. The scattering of orientations...
Main Authors: | , , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.539.9931 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea051.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.539.9931 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.539.9931 2023-05-15T13:32:25+02:00 Tectonic evolution of northern Antarctic Peninsula from brittle mesostructures and earthquake focal mechanisms A. Maestro J. López-martínez F. Bohoyo The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.539.9931 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea051.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.539.9931 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea051.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea051.pdf text ftciteseerx 2016-01-08T10:59:19Z Summary Paleostress results derived from brittle mesoscopic structures at locations on the South Shetland Islands, Antarctic Peninsula and Seymour Island and from focal mechanism analysis show a stress field characterized by both extensional and compressional regimes. The scattering of orientations of maximum horizontal stress (σ1) about NW–SE to N–S and NE–SW trends and of minimum horizontal stress (σ3) with two main NE–SW and NW–SE modes suggests that two stress sources have been responsible for the dominant directions of maximum and minimum horizontal stress in this area. Compresional structures are related to former Phoenix Plate subduction under the Antarctic Plate in Jurassic to present time and to Quaternary isostatic uplift. Stress states with NW–SE trends of σ3 are compatible with subduction-related back-arc extension in the eastern Antarctic Peninsula. NE–SW σ3 orientations are associated with continental fragmentation of the northern Antarctic Peninsula during the Cenozoic. Citation: Maestro, A., J. López-Martínez, and F. Bohoyo (2007), Tectonic evolution of northern Antarctic Peninsula from brittle mesostructures and earthquakes focal mechanisms, in Antarctica: A Keystone in a Changing World – Online Proceedings of the 10th ISAES X, edited by A. K. Cooper Text Antarc* Antarctic Antarctic Peninsula Antarctica Seymour Island South Shetland Islands Unknown Antarctic Antarctic Peninsula Martínez ENVELOPE(-62.183,-62.183,-64.650,-64.650) Seymour ENVELOPE(-56.767,-56.767,-64.283,-64.283) Seymour Island ENVELOPE(-56.750,-56.750,-64.283,-64.283) South Shetland Islands The Antarctic |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
Summary Paleostress results derived from brittle mesoscopic structures at locations on the South Shetland Islands, Antarctic Peninsula and Seymour Island and from focal mechanism analysis show a stress field characterized by both extensional and compressional regimes. The scattering of orientations of maximum horizontal stress (σ1) about NW–SE to N–S and NE–SW trends and of minimum horizontal stress (σ3) with two main NE–SW and NW–SE modes suggests that two stress sources have been responsible for the dominant directions of maximum and minimum horizontal stress in this area. Compresional structures are related to former Phoenix Plate subduction under the Antarctic Plate in Jurassic to present time and to Quaternary isostatic uplift. Stress states with NW–SE trends of σ3 are compatible with subduction-related back-arc extension in the eastern Antarctic Peninsula. NE–SW σ3 orientations are associated with continental fragmentation of the northern Antarctic Peninsula during the Cenozoic. Citation: Maestro, A., J. López-Martínez, and F. Bohoyo (2007), Tectonic evolution of northern Antarctic Peninsula from brittle mesostructures and earthquakes focal mechanisms, in Antarctica: A Keystone in a Changing World – Online Proceedings of the 10th ISAES X, edited by A. K. Cooper |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
A. Maestro J. López-martínez F. Bohoyo |
spellingShingle |
A. Maestro J. López-martínez F. Bohoyo Tectonic evolution of northern Antarctic Peninsula from brittle mesostructures and earthquake focal mechanisms |
author_facet |
A. Maestro J. López-martínez F. Bohoyo |
author_sort |
A. Maestro |
title |
Tectonic evolution of northern Antarctic Peninsula from brittle mesostructures and earthquake focal mechanisms |
title_short |
Tectonic evolution of northern Antarctic Peninsula from brittle mesostructures and earthquake focal mechanisms |
title_full |
Tectonic evolution of northern Antarctic Peninsula from brittle mesostructures and earthquake focal mechanisms |
title_fullStr |
Tectonic evolution of northern Antarctic Peninsula from brittle mesostructures and earthquake focal mechanisms |
title_full_unstemmed |
Tectonic evolution of northern Antarctic Peninsula from brittle mesostructures and earthquake focal mechanisms |
title_sort |
tectonic evolution of northern antarctic peninsula from brittle mesostructures and earthquake focal mechanisms |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.539.9931 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea051.pdf |
long_lat |
ENVELOPE(-62.183,-62.183,-64.650,-64.650) ENVELOPE(-56.767,-56.767,-64.283,-64.283) ENVELOPE(-56.750,-56.750,-64.283,-64.283) |
geographic |
Antarctic Antarctic Peninsula Martínez Seymour Seymour Island South Shetland Islands The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Martínez Seymour Seymour Island South Shetland Islands The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Seymour Island South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Seymour Island South Shetland Islands |
op_source |
http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea051.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.539.9931 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea051.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766026872454381568 |