A tsunami deposit at the Cretaceous-Tertiary boundary in Argentina
Scasso RA, Concheyro A, Kießling W, Aberhan M, Hecht L, Medina FA, Tagle R (2005)
Publication Language: English
Publication Type: Journal article, Original article
Publication year: 2005
Journal
Publisher: Elsevier
Book Volume: 26
Pages Range: 283-297
Journal Issue: 2
DOI: 10.1016/j.cretres.2004.12.003
Abstract
A coarse-grained sandstone bed of Cretaceous/Paleogene (K/Pg) boundary age occurs in a homogeneous neritic shelf mudstone sequence (Jagüel Formation) in the Neuquén Basin of Argentina. This bed, 15–25 cm thick, contains abundant plagioclase, broken shells and sharks' teeth. Sedimentological features include an erosive base, abundant rip-up clasts, normal grading and hummocky cross-bedding. The K/Pg boundary age of the bed was confirmed by calcareous nannofossils. Similar to other sections in the Gulf Coast region and the Danish Basin, a “dead zone” significantly depleted in macrofossils is evident in the basal 1 m above the clastic layer. In combination, these features suggest that the clastic layer represents a tsunami deposit that was related to the Chicxulub impact event in Yucatan/Mexico. Mechanisms of tsunami wave amplification in this extremely distal and somewhat protected setting are poorly understood but the funnel-shape of the basin may have promoted the unusually strong sedimentological response.
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Germany (DE)How to cite
APA:
Scasso, R.A., Concheyro, A., Kießling, W., Aberhan, M., Hecht, L., Medina, F.A., & Tagle, R. (2005). A tsunami deposit at the Cretaceous-Tertiary boundary in Argentina. Cretaceous Research, 26(2), 283-297. https://dx.doi.org/10.1016/j.cretres.2004.12.003
MLA:
Scasso, Roberto A., et al. "A tsunami deposit at the Cretaceous-Tertiary boundary in Argentina." Cretaceous Research 26.2 (2005): 283-297.
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