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

Author(s)

Dias, A. N. C. ^[1] ; Chemale Jr, F. ; Candeiro, C. R. A. ^[2] ; Lana, C. C. ^[3] ; Guadagnin, F. ^[4] ; Sales, A. S. W. ^[1]

Affiliation

^[1] Univ Fed Sao Carlos, Dep Fis Quim & Matemat, CCTS, Campus Sorocaba, Km 110, BR-18052780 Sorocaba, SP - Brazil

^[2] UFG, Dep Geol, Campus Aparecida Goiania, BR-74968755 Aparecida De Goiania, Go - Brazil

^[3] Univ Fed Ouro Preto, Dep Geologia, Campus Univ, BR-35400000 Ouro Preto, MG - Brazil

^[4] UNIPAMPA, Campus Cacapava Sul, BR-96570000 Cacapava Do Sul, RS - Brazil

• Document type: Journal article
• Source: Journal of South American Earth Sciences; v. 106, MAR 2021.
• Web of Science Citations: 0

Abstract

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 epsilon Hf(t) signatures can characterize the Goias 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. (AU)

• FAPESP's process: 14/13792-5 - Evolution study of Brazilian sedimentary basins by zircon fission track thermochronology
• Grantee: Airton Natanael Coelho Dias
• Support Opportunities: Regular Research Grants