Paleomagnetism of Jurassic and Cretaceous rocks in central Patagonia: A key to constrain the timing of rotations during the breakup of southwestern Gondwana?

A paleomagnetic study in Jurassic and Cretaceous rocks from the Canadon Asfalto basin, central Patagonia, indicates the occurrence of about 25-30°clockwise rotation in Upper Jurassic-lowermost Cretaceous rocks, whereas the overlying mid-Cretaceous rocks do not show evidence of rotation. This constra...

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Autores principales: Geuna, S.E., Somoza, R., Vizán, H., Figari, E.G., Rinaldi, C.A.
Formato: JOUR
Materias:
Gondwana
Mesozoic
Paleomagnetism
Patagonia
Tectonics
continental breakup
Cretaceous
Jurassic
paleomagnetism
supercontinent
tectonic rotation
South America
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0012821X_v181_n1-2_p145_Geuna
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_0012821X_v181_n1-2_p145_Geuna2023-10-03T14:10:28Z Paleomagnetism of Jurassic and Cretaceous rocks in central Patagonia: A key to constrain the timing of rotations during the breakup of southwestern Gondwana? Geuna, S.E. Somoza, R. Vizán, H. Figari, E.G. Rinaldi, C.A. Gondwana Mesozoic Paleomagnetism Patagonia Tectonics continental breakup Cretaceous Gondwana Jurassic paleomagnetism supercontinent tectonic rotation South America A paleomagnetic study in Jurassic and Cretaceous rocks from the Canadon Asfalto basin, central Patagonia, indicates the occurrence of about 25-30°clockwise rotation in Upper Jurassic-lowermost Cretaceous rocks, whereas the overlying mid-Cretaceous rocks do not show evidence of rotation. This constrains the tectonic rotation to be related to a major regional unconformity in Patagonia, which in turn seems to be close in time with the early opening of the South Atlantic Ocean. The sense and probably the timing of this rotation are similar to those of other paleomagnetically detected rotations in different areas of southwestern Gondwana, suggesting a possible relationship between these and major tectonic processes related with fragmentation of the supercontinent. On the other hand, the mid-Cretaceous rocks in the region yield a paleopole located at Lat. 87°South, Long. 159°East, A95 = 3.8°. This pole position is consistent with coeval high-quality paleopoles of other plates when transferred to South American coordinates, implying it is an accurate determination of the Aptian (circa 116 Ma) geomagnetic field in South America. (C) 2000 Elsevier Science B.V. All rights reserved. Fil:Geuna, S.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Somoza, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vizán, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Figari, E.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Rinaldi, C.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0012821X_v181_n1-2_p145_Geuna
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Gondwana
Mesozoic
Paleomagnetism
Patagonia
Tectonics
continental breakup
Cretaceous
Gondwana
Jurassic
paleomagnetism
supercontinent
tectonic rotation
South America
spellingShingle Gondwana
Mesozoic
Paleomagnetism
Patagonia
Tectonics
continental breakup
Cretaceous
Gondwana
Jurassic
paleomagnetism
supercontinent
tectonic rotation
South America
Geuna, S.E.
Somoza, R.
Vizán, H.
Figari, E.G.
Rinaldi, C.A.
Paleomagnetism of Jurassic and Cretaceous rocks in central Patagonia: A key to constrain the timing of rotations during the breakup of southwestern Gondwana?
topic_facet Gondwana
Mesozoic
Paleomagnetism
Patagonia
Tectonics
continental breakup
Cretaceous
Gondwana
Jurassic
paleomagnetism
supercontinent
tectonic rotation
South America
description A paleomagnetic study in Jurassic and Cretaceous rocks from the Canadon Asfalto basin, central Patagonia, indicates the occurrence of about 25-30°clockwise rotation in Upper Jurassic-lowermost Cretaceous rocks, whereas the overlying mid-Cretaceous rocks do not show evidence of rotation. This constrains the tectonic rotation to be related to a major regional unconformity in Patagonia, which in turn seems to be close in time with the early opening of the South Atlantic Ocean. The sense and probably the timing of this rotation are similar to those of other paleomagnetically detected rotations in different areas of southwestern Gondwana, suggesting a possible relationship between these and major tectonic processes related with fragmentation of the supercontinent. On the other hand, the mid-Cretaceous rocks in the region yield a paleopole located at Lat. 87°South, Long. 159°East, A95 = 3.8°. This pole position is consistent with coeval high-quality paleopoles of other plates when transferred to South American coordinates, implying it is an accurate determination of the Aptian (circa 116 Ma) geomagnetic field in South America. (C) 2000 Elsevier Science B.V. All rights reserved.
format JOUR
author Geuna, S.E.
Somoza, R.
Vizán, H.
Figari, E.G.
Rinaldi, C.A.
author_facet Geuna, S.E.
Somoza, R.
Vizán, H.
Figari, E.G.
Rinaldi, C.A.
author_sort Geuna, S.E.
title Paleomagnetism of Jurassic and Cretaceous rocks in central Patagonia: A key to constrain the timing of rotations during the breakup of southwestern Gondwana?
title_short Paleomagnetism of Jurassic and Cretaceous rocks in central Patagonia: A key to constrain the timing of rotations during the breakup of southwestern Gondwana?
title_full Paleomagnetism of Jurassic and Cretaceous rocks in central Patagonia: A key to constrain the timing of rotations during the breakup of southwestern Gondwana?
title_fullStr Paleomagnetism of Jurassic and Cretaceous rocks in central Patagonia: A key to constrain the timing of rotations during the breakup of southwestern Gondwana?
title_full_unstemmed Paleomagnetism of Jurassic and Cretaceous rocks in central Patagonia: A key to constrain the timing of rotations during the breakup of southwestern Gondwana?
title_sort paleomagnetism of jurassic and cretaceous rocks in central patagonia: a key to constrain the timing of rotations during the breakup of southwestern gondwana?
url http://hdl.handle.net/20.500.12110/paper_0012821X_v181_n1-2_p145_Geuna
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