Fission track and U–Pb in situ dating applied to detrital zircon from the Vale do Rio do Peixe Formation, Bauru Group, Brazil

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...

Full description

Saved in:

Bibliographic Details
Published in:	Journal of South American earth sciences Vol. 31; no. 2; pp. 298 - 305
Main Authors:	Dias, A.N.C., Tello, C.A.S., Chemale, F., de Godoy, M.C.T.F., Guadagnin, F., Iunes, P.J., Soares, C.J., Osório, A.M.A., Bruckmann, M.P.
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-03-2011
Subjects:	Bauru Group U–Pb in situ dating Vale do Rio do Peixe Formation Zircon fission track Zircon fission track Vale do Rio do Peixe Formation Bauru Group U–Pb in situ dating
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	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. ► Detrital zircon of Bauru Basin, Brazil, dated by combined FT and U-Pb analyses. ► FT zircon ages reflect the main denudation processes of the South American Plate. ► U-Pb data shows two tectonic events: the Early Paleozoic and Neoproterozoic. ► The combined information allows characterizing main source for the zircons.
ISSN:	0895-9811 1873-0647
DOI:	10.1016/j.jsames.2011.02.003