Tsunamiites - conceptual descriptions and a possible case at the Cretaceous-Tertiary boundary in the Pernambuco basin, northeastern Brazil
Albertão, G.A.; Martins Jr., P.P.; Marini, F. (2008). Tsunamiites - conceptual descriptions and a possible case at the Cretaceous-Tertiary boundary in the Pernambuco basin, northeastern Brazil, in: Shiki, T. et al. (Ed.) Tsunamiites: features and implications. pp. 217-250
In: Shiki, T. et al. (2008). Tsunamiites: Features and implications. Elsevier: Amsterdam. ISBN 978-0-444-51552-0. xiii, 411 pp., meer
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| Trefwoorden |
Impacts
Water waves > Surface water waves > Tsunamis
Brazil, Pernambuco [Marine Regions]
Marien/Kust |
| Auteurs | | Top |
- Albertão, G.A.
- Martins Jr., P.P.
- Marini, F.
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| Abstract |
An important occurrence of a highly probable impact-derived tsunamiite in the Pernambuco Basin, northeastern Brazil, is discussed in detail. This possible tsunamiite occurs within a sedimentary succession spanning the Cretaceous/Tertiary (K/T) boundary, where interdisciplinary and integrated investigations provide direct evidence for the impact of an extraterrestrial bolide. The bed involved shows sedimentary characteristics and exotic (probably impact-derived)material that suggest the action of tsunami waves. The iridium (Ir) concentration throughout the succession records a major peak (up to 69 times the background levels) at about 60 cm above the base of the interpreted tsunamiite. The controversial exact position of the K/T boundary as well as the implications of the currently different interpretations is discussed. |
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