Palynology and geochemistry of the Frasnian global transgression in the Parnaiba Basin, Brazil
Steemans, P.; Pereira, E.; Le Hérissé, A.; Grahn, Y.; Streel, M.; Brito, M.; Bergamaschi, S.; Rodrigues, R. (2021). Palynology and geochemistry of the Frasnian global transgression in the Parnaiba Basin, Brazil. Rev. Palaeobot. Palynol. 284: 104345. https://hdl.handle.net/10.1016/j.revpalbo.2020.104345 In: Review of Palaeobotany and Palynology. Elsevier: Tokyo; Oxford; Lausanne; New York; Shannon; London; Amsterdam. ISSN 0034-6667; e-ISSN 1879-0615, more |  |
| Keywords | Acritarcha [WoRMS]; Chitinozoa
Marine/Coastal | | Author keywords | Miospores; Acritarchs; Chitinozoan; Geochemistry; Frasnian; Brazil |
| Authors | | Top | - Steemans, P., more
- Pereira, E.
- Le Hérissé, A.
- Grahn, Y.
| - Streel, M., more
- Brito, M.
- Bergamaschi, S.
- Rodrigues, R.
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| Abstract | An integrated palynological and geochemical approach has been initiated to date and to precise the geochemical events of the Pimenteiras Formation, in the Late Devonian from the Parnaíba Basin, Brazil. Based on good biostratigraphic markers and presence of index species among miospores, acritarchs and chitinozoa, the investigated sequences are referred to the Middle to early Late Frasnian. Among Miospores, Chelinospora concinna and Verrucosisporites bulliferus are likely to be from the BPi Interval Zone defined in the Amazon Basin. Chitinozoans of the Early to early Late Frasnian Angochitina (Lagenochitina) avelinoi zone of the Parnaíba Basin are present, and acritarch assemblages are also consistent with a Middle to early Late Frasnian age, by comparison to assemblages previously described in other Brazilian basins. Some important accompanying species of palynomorphs are illustrated. In the studied outcrops, black shale intervals are referred to top of the Radioactive Sale B and Radioactive Shale C according to Rodrigues (1995) definitions. Top of Radioactive Shale B shows good concentration of terrestrial organic matter, but low potential source of gas. By comparison Radioactive Shale C of the upper part of the Pimenteiras Formation, with important concentration of marine organic matter have low to high potential as source of gas and condensate. This study shows that a progressive flooding took place during the Devonian period in the Parnaíba Basin with maximum marine transgression in the Frasnian. These global events of interest for hydrocarbon exploration, are regarded as markers for Gondwanan regional chronostratigraphic correlations. |
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