Early Permian and Early Triassic Palaeomagnetic Results From The Peruvian Andes, Southern Peru

Abstract:

Mismatch between the Permo-Triassic poles from Laurentia and Gondwana on Pangea A reconstruction have been discussed as resulting from the poor age control and poor quality of the Late Palaeozoic palaeomagnetic data from Gondwana, and/or significant contribution of non-dipolar fields during Late Palaeozoic-Mesozoic. Palaeomagnetic data from the autochthonous Altiplano and sub-Andean zone of the Peruvian Andes, reported here, provide new data for these arguments. Magnetic directions obtained from Permo-Triassic volcanics (244+/-6 Ma; K/Ar) of the Mitu Group show both polarity magnetizations, and provide a positive fold test (significant at 99% level), and a positive reversal test (class A), yielding a pole at 79 S/352.8 E (dp: 1, 3; dm: 2.3) in south American coordinates, and 41.65 S/069.36 E in African coordinates. The Lower Asselian-Sakmarian (fossils, palynomorphs) Copacabana Group yields …

Año de publicación:

2002

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