Tectonic geoheritage in the central Ribeira Belt: analysis of boudins as records of the regional evolution, north coast of São Paulo

• Grant number: 20/16730-1
• Support Opportunities: Scholarships in Brazil - Master
• Effective date (Start): August 01, 2021
• Effective date (End): August 31, 2023
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Maria da Glória Motta Garcia
• Grantee: Karina de Souza Ibanez
• Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated scholarship(s): 22/00814-7 - Geodiversity of the Yosemite National Park, USA: geoheritage analysis and geoscience communication, BE.EP.MS

Abstract

The north coast of the state of São Paulo presents a rich geodiversity, with geological features that characterize a complex evolution related to the formation and rupture of the Western Gondwana supercontinent and is inserted in the central portion of the Ribeira Belt. Geosites are places where geodiversity has high relevance, by recording, through their features, important geological processes that help to better understand the geological history of our planet. The region has been the focus of inventories of geological heritage since 2012, whose main objective is to identify geosites with the best records of the geological history, in order to understand, disseminate and preserve for science and for future generations. In this context, in the study of the geosite "Boudins of the Camburizinho Islet", studied by the student in the undergraduate final project, there was a need to deepen the analysis of striking features of boudinage in the geosite and in nearby outcrops. The boudins exhibit a complex past geological history and their in-depth analysis is a central object of this research. The study of these features can provide a relevant understanding of the deformation and its rheological characteristics. Research methods include structural, geochemical and geochronological analysis and the use of geospatial products obtained from unmanned aerial vehicle images. The results obtained will be essential for a better understanding of the relationship between the boudinage processes of the characterized sites and the regional geological evolution. The records of the scientific relevance of these sites, obtained from this research, will be important subsidies for the valorization of the tectonic geological heritage of the region.