Paleomagnetism of Metamorphic Rocks from de Piquete Region - Ribeira Valley, Southeastern Brazil
Paleomagnetic data are presented corresponding to 42 hand samples of metamorphic rocks exposed in the Piquete region (Ribeira Valley, Southeastern Brazil - 22º 35'S, 45º 15'W). K-Ar age determinations suggest a Late Cambrian - Early Ordovician age for the cooling phase of these metamorphic rocks. After paleomagnetic treatment, a reversed direction in 20 samples from 9 sites was isolated (Dm = 60.4, Im = 68.0, α95=6.8) which yielded a paleomagnetic pole at Lat. = 0.8° N, Long. = 346.5º E (α 95=10.2). Most of the remaining samples present unstable remanence. It is shown that this reversed direction may be representative of the cooling phase of these metamorphic rocks.
Para solicitação do artigo, entrar em contato com editor-chefe (email@example.com).
a partir do v.37n.4 (2019) até o presente
v.15n.1 (1997) até v.37n.3 (2019)
Brazilian Journal of Geophysics - BrJG
Sociedade Brasileira de Geofísica - SBGf
Av. Rio Branco 156 sala 2509
Rio de Janeiro, RJ, Brazil
Phone/Fax: +55 21 2533-0064