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Geology; March 2001; v. 29; no. 3; p. 231-234; DOI: 10.1130/0091-7613(2001)029<0231:SAASDA>2.0.CO;2
© 2001 Geological Society of America
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Slumping and a sandbar deposit at the Cretaceous-Tertiary boundary in the El Tecolote section (northeastern Mexico): An impact-induced sediment gravity flow

Ana R. Soria*,1, Carlos L. Liesa1, Maria Pilar Mata2, José A. Arz3, Laia Alegret4, Ignacio Arenillas4 and Alfonso Meléndez4

1 Departamento de Ciencias de la Tierra, Universidad de Zaragoza, E-50009, Spain
2 Facultad de Ciencias del Mar, Departamento de Geología, Universidad de Cádiz, Puerto Real, E-11510, Spain
3 Facultad de Ciencias de la Tierra, Universidad Autónoma de Nuevo León, Linares, MEX-67700, Mexico
4 Departamento de Ciencias de la Tierra, Universidad de Zaragoza, E-50009, Spain

Slumps affecting uppermost Méndez Formation marls, as well as the spherulitic layer and basal part of the sandy deposits of the Cretaceous-Tertiary (K-T) boundary clastic unit, are described at the new K-T El Tecolote section (northeastern Mexico). These K-T clastic deposits represent sedimentation at middle-bathyal water depths in channel and nonchannel or levee areas of reworked materials coming from environments ranging from outer shelf to shallower slope via a unidirectional, high- to low-density turbidite flow. We emphasize the development and accretion of a lateral bar in a channel area from a surging low-density turbidity current and under a high-flow regime. The slumps discovered on land and the sedimentary processes of the K-T clastic unit reflect destabilization and collapse of the continental margin, support the mechanism of gravity flows in the deep sea, and represent important and extensive evidence for the impact effects in the Gulf of México triggered by the Chicxulub event.

Key Words: K-T boundary • slumping • sand bars • gravity flows • Mexico




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