Fission track and U–Pb in situ dating applied to detrital zircon from the Vale do Rio do Peixe Formation,Bauru Group,Brazil |
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| Authors: | ANC Dias CAS Tello F Chemale MCTF de Godoy F Guadagnin PJ Iunes CJ Soares AMA Osório MP Bruckmann |
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| Institution: | 1. Department of Agrochemistry and Environment (GEA-UMH), Miguel Hernández University of Elche, Alicante, Spain;2. Department of Stratigraphy, Complutense University of Madrid, Spain;3. Lab/Grupo de Materiales Vítreos y Cerámicos, Inst. E. Torroja CC Construcción, CSIC, Madrid, Spain;1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;3. Center of Isotopic Research, A.P. Karpinsky Russian Geological Research Institute (VSEGEI), Srednii pr. 74, St. Petersburg, 199106, Russia;4. St. Petersburg State University, Department of Geology, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia;1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;3. Center of Isotopic Research, A.P. Karpinsky Russian Research Geological Institute, Srednii pr. 74, St. Petersburg, 199106, Russia;4. Institute of Geosciences, Saint Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia;1. Fac. de Ciências e Tecnologia, Univ. Federal de Goiás, Setor Conde dos Arcos, 74968755 Aparecida de Goiânia, GO, Brazil;2. Departamento de Física, Química e Matemática, UFSCar - Campus Sorocaba, 18052780 Sorocaba, SP, Brazil;3. Programa de Pós-Graduação em Geologia. Universidade do Vale do Rio dos Sinos, 93022000 São Leopoldo, RS, Brazil;4. Instituto de Geociências, Universidade de Brasília, Campus Univ. Darcy Ribeiro, Asa Norte, 70910900 Brasília, DF, Brazil |
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| Abstract: | Combined methods of fission track (FTM) and U–Pb in situ zircon dating were applied to sedimentary samples from the Vale do Rio do Peixe Formation, Bauru Basin, Brazil. Detrital zircons of nine samples were determined by the FTM, and the obtained ages varied from 239 Ma–825 Ma, which can be grouped into four main populations as the 230–300 Ma, 460–490 Ma, 500–650 Ma and 696–825 Ma groups. The U–Pb data show two clear source areas: the Early Paleozoic to Neoproterozoic zircons, ranging from 445 ± 14 to 708 ± 18 Ma, and the Paleoproterozoic zircons, ranging from 1879 ± 23 to 2085 ± 27 Ma. Subordinate occurrences of Early Neoproterozoic to Mesoproterozoic zircons (836 ± 15 and 1780 ± 38 Ma) were identified. The combined information allows us to characterize Early Brazilian, Brazilian and Rhyacian material as the main source for the zircons, which are areas situated to west of the Bauru Basin (e.g., Goiás Massif) that have been incorporated into the sedimentary cycles in the Phanerozoic (mainly in the Paraná Basin). FT zircon ages reflect the main denudation processes of the South American Plate from Neoproterozoic to Early Triassic as those related to orogenic cycles of Early Brazilian, Brazilian, Famatinian/Cuyanian and Gondwanide. |
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