Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A new tonstein occurrence in the eastern Parana Basin associated with the Figueira coalfield (Parana, Brazil): Palynostratigraphy and U-Pb radiometric dating integration

Full text
Author(s):
Jurigan, Isabela [1] ; Ricardi-Branco, Fresia [1] ; Neregato, Rodrigo [2] ; Saraiva dos Santos, Ticiano Jose [1]
Total Authors: 4
Affiliation:
[1] Univ Estadual Campinas, Geosci Inst, Carlos Gomes 250, BR-13083855 Campinas, SP - Brazil
[2] Univ Rio Grande do Sul, POB 15001, BR-91501970 Porto Alegre, RS - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Journal of South American Earth Sciences; v. 96, DEC 2019.
Web of Science Citations: 0
Abstract

Tonsteins are layers generated from volcanic ash fall and constitute an important chronostratigraphic marker that allows the correlation between layers in and out of the sedimentary basin, as well as the calibration of biostratigraphic frameworks. In this contribution a new occurrence of tonstein is reported associated with the coal seams in Parana state, in the Parana Basin, and it was used as a tie point in local and intra-Gondwanan palynostratigraphy. First, the volcanic origin of the layer was attested by using methods as petrography, SEM and XRD. Then, the layer was dated by U-Pb zircon with LA-ICP-MS method, obtaining an age of 286 +/- 3 Ma which corresponds to the Artinskian (middle Cisuralian), thus the layers are correlated with the coal seam from Faxinal coalfield. However, the palynostratigraphic position for the studied interval was at the Protohaploxypinus goraiensis Subzone (lower Vittatina costabilis Zone), due to the presence of Protohaploxypinus goraiensis, Illinites unicus, Vittatina, and Converrucosisporites confiuens while palynostratigraphy of Faxinal places it at the Hamiapollenites karooensis Subzone (upper Vittatina costabdis Zone). Therefore, one possible explanation is that the boundary between the subzones of Vittatina costabilis Zone is younger on the studied site than in the rest of the basin. (AU)

FAPESP's process: 16/20927-0 - STUDIES OF MODERN AND FOSSIL BIOCLAST ACCUMULATIONS RELATED TO CONTINENTAL AND COASTAL ENVIRONMENTS
Grantee:Fresia Soledad Ricardi Torres Branco
Support Opportunities: Regular Research Grants