New paleomagnetic data from the Parana Magmatic Province: Brief emplacement time and tectonism

Autor(es)

Ernesto, Marcia ^[1] ; Zaffani, Luiz Alberto ^{[1, 2]} ; Caminha-Maciel, George ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Dept Geofis, BR-05508900 Sao Paulo, SP - Brazil

^[2] Univ Metropolitana Santos, Santos, SP - Brazil

^[3] Univ Fed Santa Catarina, Dept Geol, Florianopolis, SC - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of South American Earth Sciences; v. 106, MAR 2021.
• Citações Web of Science: 0

Resumo

The Parana Magmatic Province (PMP) in southern Brazil is divided into three sub-provinces historically characterized by their Ti content (low-Ti in the southern sub-province, high-Ti in the northern, and mixed in the central sub-province). Ar/Ar and U-Pb ages for the PMP usually places the whole volcanism in a brief interval of-135-133 Ma with younger ages to the north. The existing paleomagnetic data tend to show differences among the three areas, so far related to the age migration. The new data from 39 flows and sills from the Northern Parana Magmatic Province incorporated into the pre-existing database allowed the calculation of a new paleomagnetic pole after filtering the over-represented sites. However, the recalculated pole for the central PMP using all available data is distinct from the other poles. The mean magnetic inclination for the rocks of central PMP is similar to 5 degrees lower than the inclination for the other areas, which may be caused by an N-S dipping of the central area. (AU)

• Processo FAPESP: 04/10081-9 - Os derrames e sills da regiao norte da provincia magmatica do parana: petrogenese e contexto geodinamico.
• Beneficiário: Leila Soares Marques
• Modalidade de apoio: Auxílio à Pesquisa - Regular