Leandro C. Gallo, Renata N. Tomezzoli, Alejandra Dalenz Farjat, Roberto M. Hernández
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Latinmag Letters, Volume 6, Special Issue (2016), B13, 1-6. Proceedings São Paulo, Brasil
Se realizó una selección rigurosa de polos paleomagnéticos (PP) pertenecientes al Gondwana Sudamérica, África, Antártida y Australia) desde el Carbonífero hasta el Triásico con el objetivo de construir una curva de deriva polar aparente (CDPA) compuesta. La CDPA obtenida cuenta con 78 PP provenientes de rocas sedimentarias corregidos por errores de inclinación, de rocas sedimentarias portadoras de magnetizaciones sin o post-tectónicas, donde la edad de la magnetización se encuentra acotada y de rocas ígneas que se consideran libres de errores de inclinación. La utilización de PP provenientes de todo el Gondwana demuestra geométricamente que los mismos no estarían afectados significativamente por errores de inclinación. La coherencia visual obtenida para cada intervalo de tiempo soporta la construcción de la CDPA propuesta para el Paleozoico Superior. Los resultados permiten realizar un modelo tectónico para la evolución de Pangea consistente con la configuración tipo Pangea B para el Pérmico y una posterior transición hacia Pangea A durante el Pérmico superior y el Triásico.
In order to build an apparent polar wander path (APWP) we have undertaken a rigorous selection of
paleomagnetic poles (PP) belonging to Gondwana (South America, Africa, Antarctica and Australia) from
the Carboniferous to the Triassic. The APWP has 78 PP obtained from sedimentary rocks corrected for
inclination shallowing, from sedimentary rocks with syn or post-tectonic magnetizations, the age of the
magnetization is restricted and from igneous rocks that are regarded as free from any inclination shallowing bias. The use of PP from all around Gondwana shows geometrically that they would not be substantially affected by inclination shallowing. Visual consistency obtained for each age range supports the construction of this Paleozoic APWP. The results allow a tectonic model for the evolution consistent with a B type Pangea configuration for the Permian and a subsequent transition to Pangea A during the Upper Permian and Triassic.
paleomagnetic poles (PP) belonging to Gondwana (South America, Africa, Antarctica and Australia) from
the Carboniferous to the Triassic. The APWP has 78 PP obtained from sedimentary rocks corrected for
inclination shallowing, from sedimentary rocks with syn or post-tectonic magnetizations, the age of the
magnetization is restricted and from igneous rocks that are regarded as free from any inclination shallowing bias. The use of PP from all around Gondwana shows geometrically that they would not be substantially affected by inclination shallowing. Visual consistency obtained for each age range supports the construction of this Paleozoic APWP. The results allow a tectonic model for the evolution consistent with a B type Pangea configuration for the Permian and a subsequent transition to Pangea A during the Upper Permian and Triassic.
http://www.geofisica.unam.mx/LatinmagLetters/LL16-01-SP/B/B13.pdf
