Unraveling multiple tectonic events and source areas in the intracratonic Bauru Basin through combined zircon geo and thermochronological studies

• Published in: Journal of South American earth sciences Vol. 106; p. 103061
• Main Authors: Dias, A.N.C., Chemale, F., Candeiro, C.R.A., Lana, C.C., Guadagnin, F., Sales, A.S.W.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-03-2021
• Subjects: Bauru group; Fission-track thermochronology; LIP Serra geral; Lu–Hf isotopes; U–Pb zircon Dating; Fission-track thermochronology; Bauru group; LIP Serra geral; U–Pb zircon Dating; Lu–Hf isotopes
• ISSN: 0895-9811; 1873-0647
• DOI: 10.1016/j.jsames.2020.103061

The application of Fission-Track Thermochronology (FTT), and U-Pb and Lu-Hf isotope analyses on the same zircon grains revealed the provenance and thermal/tectonic events related to the build-up and evolution of the Bauru Basin filling in Minas Gerais, Brazil. The U-Pb on detrital zircon reveals that the potential source areas were dominated by Brasiliano outcrops and subordinately, Paleoproterozoic, Mesoproterozoic, and Carboniferous sources. Positive εHf(t) signatures can characterize the Goiás magmatic Arc and older adjacent terranes as the most probable region that supplied the Bauru Basin. The FTT data display five main age peaks at 569, 337, 235, 132, and 83 Ma. They record the exhumation and denudation processes of Brasiliano and Gondwanide orogens and later, the Serra Geral magmatism of the South American Platform. A younger subordinate age (100–80 Ma) is recorded, and it may be associated with intense alkaline magmatism that occurred during the initial stages of basin deposition.
•FTT, U-Pb, and Lu-Hf analyses unraveling the provenance and thermal/tectonic events in the Bauru Basin, Brazil.•The FTT data have five main age peaks at 569 Ma, 337 Ma, 235 Ma, 132 Ma, and 83 Ma.•The combined U-Pb and Lu-Hf detrital zircon dating suggest potential source areas for the Bauru Basin deposits.•Positive and negative εHf(t) values suggest source rocks of the Brasilia Belt and Goiás Magmatic Arc for the Bauru Basin.