Late Cretaceous alkaline complexes, southeastern Brazil: Paleomagnetism and geochronology

Details Late Cretaceous alkaline complexes, southeastern Brazil: Paleomagnetism and geochronology Late Cretaceous alkaline complexes, southeastern Brazil: Paleomagnetism and geochronology

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.134..425m&link_type=abstract

Earth and Planetary Science Letters, vol. 134, Issue 3-4, pp.425-440

Physics

12

Scientific paper

Late Cretaceous alkaline rocks from Poços de Caldas, Itatiaia, Passa Quatro and São Sebastião Island were studied with the main purpose of improving the South American apparent polar wander path (APWP). Rb-Sr age determinations for Passa Quatro and alkaline stocks from São Sebastião Island are around 70 and 81 Ma respectively. The magnetic carriers in the rocks studied were maghemite and highly oxidized titanomagnetites. The paleomagnetic poles obtained in this work are 320.1°E, 83.2°S ( N = 47, A 95 = 2.7°, K SC = 2609.8) for Poços de Caldas, 360.0°E, 79.5°S ( N = 18, A 95 = 5.7°, K SC = 607.4) for Passa Quatro and Itatiaia, and 331.9°E, 79.4°S ( N = 18, A 95 = 4.9°, K SC = 862.4) for São Sebastião Island (the ISLAND set).

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