SciELO - Scientific Electronic Library Online

 
vol.28 número1Variaciones isotópicas (210Pb, 137Cs) antropogénicas en el registro estratigráfico de un lago de la cordillera de Nahuelbuta, Chile índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Revista

Articulo

Indicadores

Links relacionados

Compartir


Revista geológica de Chile

versión impresa ISSN 0716-0208

Resumen

HARTLEY, Adrian; HOWELL, John; MATHER, Anne E.  y  CHONG, Guillermo. A possible Plio-Pleistocene tsunami deposit, Hornitos, northern Chile. Rev. geol. Chile [online]. 2001, vol.28, n.1, pp.117-125. ISSN 0716-0208.  http://dx.doi.org/10.4067/S0716-02082001000100007.

A section equivalent to the Pliocene La Portada Formation exposed in the coastal cliff at Hornitos, northern Chile, contains a ca. 7-10 m thick conglomerate bed. The bed occurs within a succession of shallow marine sandstones and has an erosional contact with underlying strata. The largest boulders of basement (5 m) are angular to very angular and are set within a matrix of very poorly sorted fine to very coarse grained shell-rich sandstone. Also present are very well rounded granodiorite pebbles and shallow marine sandstone intraclasts (maximum 10 m). The clast size, erosional contact, associated facies and bed thickness suggests that the conglomerate bed is a shallow marine tsunami deposit. The angular clasts indicate limited transport and no marine reworking prior to deposition. They represent alluvial fan sediment incorporated into the bed during tsunami backflow. Intraclasts of shallow marine sandstone are thought to have been ripped up and included in the bed during the seaward passage of the tsunami across the shoreface

Palabras clave : tsunami; northern Chile; Pliocene; shallow marine; Shallow marine; Tsunami; Pliocene; Northern Chile.

        · resumen en Español     · texto en Inglés

 

Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons