Tectonic implications of post-folding permian magnetizations in the Carapacha Basin, La Pampa province, Argentina

Paleomagnetic results from Permian clastic and igneous rocks of the Carapacha Basin of the Gondwáides orogenic zone of central Argentina are mainly consistent with results reported previously from the same zone further east, e.g., in the Sierra de la Ventana. Three lithologic entities were analysed:...

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Autores principales: Tomezzoli, R.N., Melchor, R.N., MacDonald, W.D.
Formato: JOUR
Materias:
AMS
Carapacha Basin
Gondwana
Late Paleozoic
Magnetic anisotropy
Paleomagnetism
South America
folding
lithology
magnetic anisotropy
magnetization
orogeny
paleomagnetism
Permian
tectonics
Argentina
La Pampa
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_13438832_v58_n10_p1235_Tomezzoli
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_13438832_v58_n10_p1235_Tomezzoli
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spelling todo:paper_13438832_v58_n10_p1235_Tomezzoli2023-10-03T16:09:48Z Tectonic implications of post-folding permian magnetizations in the Carapacha Basin, La Pampa province, Argentina Tomezzoli, R.N. Melchor, R.N. MacDonald, W.D. AMS Carapacha Basin Gondwana Late Paleozoic Magnetic anisotropy Paleomagnetism South America folding lithology magnetic anisotropy magnetization orogeny paleomagnetism Permian tectonics Argentina Carapacha Basin La Pampa South America Paleomagnetic results from Permian clastic and igneous rocks of the Carapacha Basin of the Gondwáides orogenic zone of central Argentina are mainly consistent with results reported previously from the same zone further east, e.g., in the Sierra de la Ventana. Three lithologic entities were analysed: the lower member and upper member of the Carapacha Formation, and an andesite intrusive into the upper member. The directions of their characteristic remanences are similar, differ significantly from the present field direction, and are post-folding. The in situ magnetization directions are moreover consistent with directions expected for late Permian poles of the APWP for South America. The in situ pole for the lower Carapacha Formation is 70°S, 049°E, A95=1° (San Roberto pole); the pole for the upper Carapacha, combined with similar directions from the intrusive, is 64°S, 005°E, A95=5° (Río Curacó pole). These magnetizations imply that the Carapacha Formation, with a minimum age of early Late Permian (about 260 Ma.), was deformed before the end of the Permian. Structural evidence, as well as paleomagnetic, IRM, and AMS experimental results, support the interpretations. The paleogeographic implications of these results are interpreted as a significant counterclockwise movement of Gondwana between the early and the late Permian. Copyright © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan: The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_13438832_v58_n10_p1235_Tomezzoli
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic AMS
Carapacha Basin
Gondwana
Late Paleozoic
Magnetic anisotropy
Paleomagnetism
South America
folding
lithology
magnetic anisotropy
magnetization
orogeny
paleomagnetism
Permian
tectonics
Argentina
Carapacha Basin
La Pampa
South America
spellingShingle AMS
Carapacha Basin
Gondwana
Late Paleozoic
Magnetic anisotropy
Paleomagnetism
South America
folding
lithology
magnetic anisotropy
magnetization
orogeny
paleomagnetism
Permian
tectonics
Argentina
Carapacha Basin
La Pampa
South America
Tomezzoli, R.N.
Melchor, R.N.
MacDonald, W.D.
Tectonic implications of post-folding permian magnetizations in the Carapacha Basin, La Pampa province, Argentina
topic_facet AMS
Carapacha Basin
Gondwana
Late Paleozoic
Magnetic anisotropy
Paleomagnetism
South America
folding
lithology
magnetic anisotropy
magnetization
orogeny
paleomagnetism
Permian
tectonics
Argentina
Carapacha Basin
La Pampa
South America
description Paleomagnetic results from Permian clastic and igneous rocks of the Carapacha Basin of the Gondwáides orogenic zone of central Argentina are mainly consistent with results reported previously from the same zone further east, e.g., in the Sierra de la Ventana. Three lithologic entities were analysed: the lower member and upper member of the Carapacha Formation, and an andesite intrusive into the upper member. The directions of their characteristic remanences are similar, differ significantly from the present field direction, and are post-folding. The in situ magnetization directions are moreover consistent with directions expected for late Permian poles of the APWP for South America. The in situ pole for the lower Carapacha Formation is 70°S, 049°E, A95=1° (San Roberto pole); the pole for the upper Carapacha, combined with similar directions from the intrusive, is 64°S, 005°E, A95=5° (Río Curacó pole). These magnetizations imply that the Carapacha Formation, with a minimum age of early Late Permian (about 260 Ma.), was deformed before the end of the Permian. Structural evidence, as well as paleomagnetic, IRM, and AMS experimental results, support the interpretations. The paleogeographic implications of these results are interpreted as a significant counterclockwise movement of Gondwana between the early and the late Permian. Copyright © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan: The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB.
format JOUR
author Tomezzoli, R.N.
Melchor, R.N.
MacDonald, W.D.
author_facet Tomezzoli, R.N.
Melchor, R.N.
MacDonald, W.D.
author_sort Tomezzoli, R.N.
title Tectonic implications of post-folding permian magnetizations in the Carapacha Basin, La Pampa province, Argentina
title_short Tectonic implications of post-folding permian magnetizations in the Carapacha Basin, La Pampa province, Argentina
title_full Tectonic implications of post-folding permian magnetizations in the Carapacha Basin, La Pampa province, Argentina
title_fullStr Tectonic implications of post-folding permian magnetizations in the Carapacha Basin, La Pampa province, Argentina
title_full_unstemmed Tectonic implications of post-folding permian magnetizations in the Carapacha Basin, La Pampa province, Argentina
title_sort tectonic implications of post-folding permian magnetizations in the carapacha basin, la pampa province, argentina
url http://hdl.handle.net/20.500.12110/paper_13438832_v58_n10_p1235_Tomezzoli
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AT macdonaldwd tectonicimplicationsofpostfoldingpermianmagnetizationsinthecarapachabasinlapampaprovinceargentina
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