Magnetostratigraphic calibration of some Early Cretaceous ostracod biozones in the Rio do Peixe, Araripe, and Lavras da Mangabeira Basins (NE Brazil)

• Grant number: 19/22166-4
• Support Opportunities: Scholarships in Brazil - Doctorate
• Effective date (Start): March 01, 2020
• Effective date (End): February 29, 2024
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Giancarlo Scardia
• Grantee: Mostafa Falahatgar
• Host Institution: Instituto de Geociências e Ciências Exatas (IGCE). Universidade Estadual Paulista (UNESP). Campus de Rio Claro. Rio Claro , SP, Brazil

Abstract

Mesozoic non-marine sedimentary sequences occur in several basins of Northeastern Brazil, among which are the Rio do Peixe, Araripe, and Lavras da Mangabeira. These successions mostly consist of lacustrine terrigenous deposits with ostracod fauna, which has been used to build a local zonation for the Late Jurassic?-Early Cretaceous (Dom João, Rio da Serra Aratu, Buracica, Juquiá, and Alagoas stages). These continental sediments are suitable for paleomagnetic dating that can be used to assess the precise age of these local biozonations in correlation with the known worldwide geomagnetic polarity reversal pattern. Aim of this proposal is to study representative stratigraphic sections of the Rio do Peixe, Araripe, and Lavras da Mangabeira Basins by means of paleomagnetism and, at a lesser extent, micropaleontology, in order to provide a correlation between the local Mesozoic Brazilian stages and the international chronostratigraphic stages. Based on above mentioned goals, this project will also involve a detailed mapping and a stratigraphic revision of the Lavras da Mangabeira Basin, as well as of the associated tectonic events which are responsible of the Basin formation and deformation. (AU)