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Sci Rep. 2018 May 31;8(1):8436. doi: 10.1038/s41598-018-25873-z.

Gondwana's Apparent Polar Wander Path during the Permian-new insights from South America.

Author information

1
Laboratorio de Paleomagnetismo "Daniel A. Valencio". Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA). Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales. Pabellón II (1428), Universidad de Buenos Aires, CABA, Argentina. renata@gl.fcen.uba.ar.
2
Departamento de Geología. Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa. Avda, Uruguay 151, L6300CLB, Santa Rosa, La Pampa, Argentina.
3
Laboratorio de Paleomagnetismo "Daniel A. Valencio". Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA). Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales. Pabellón II (1428), Universidad de Buenos Aires, CABA, Argentina.
4
Laboratorio de Termocronología (La.Te Andes). Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Las Moreras 310, A4401XBA, Vaqueros, Salta, Argentina.
5
Laboratorio de Modelado Geológico. Instituto de Estudios Andinos (IDEAN). Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires, CABA, Argentina.
6
Programa de Pos-Graduaçao em Geologia, Universidade do Vale do Rio dos Sinos, CEP 93022-000, Sao Leopoldo, Rio Grande do Sul, Brazil.

Abstract

A long-standing debate regarding the configuration of Pangea during the Late Paleozoic has been going on among the paleomagnetic community concerning the validity of one of two significantly different Pangea reconstructions (Pangea A vs Pangea B) since the proposal of Pangea B. Although, Pangea B avoids any continental overlap marring classical Pangea A configuration (Wegener's type), it requires a Carboniferous-Permian megashear of up to 1500 km to achieve the pre-Jurassic configuration. The existence of this megashear is controversial and has led to a wide range of hypotheses, in order to avoid Pangea A continental overlaps and consequently the need for major intra-Pangea movements and to accommodate the paleomagnetic database within a Pangea A reconstruction. We present paleomagnetic results from Permian volcanic rocks of the El Centinela, La Pampa, Argentina. Undeformed volcanic rocks are not affected by any inclination bias and are, therefore, ideal to test different paleogeographic models. The presence of two different paleopole positions, at the base and the top of the same stratigraphic sequence, makes this location optimal to constrain the track of the Gondwana's path during the Late Paleozoic, which shows the transition from Pangea B during the Carboniferous-Permian, to Pangea A at the Permian - Triassic boundary.

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