Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 117-125 |
| Number of pages | 9 |
| Journal | Revista Geológica de Chile |
| Volume | 28 |
| Publication status | Published - 2001 |
Keywords
- tsunami
- northern Chile
- Pliocene
- shallow marine
- Japan
Cite this
A possible Plio-Pleistocene tsunami deposit, Hornitos, northern Chile. / Hartley, A ; Howell, J ; Mather, A E ; Chong, G .
In: Revista Geológica de Chile, Vol. 28, 2001, p. 117-125.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - A possible Plio-Pleistocene tsunami deposit, Hornitos, northern Chile
AU - Hartley, A
AU - Howell, J
AU - Mather, A E
AU - Chong, G
PY - 2001
Y1 - 2001
N2 - 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.
AB - 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.
KW - tsunami
KW - northern Chile
KW - Pliocene
KW - shallow marine
KW - Japan
M3 - Article
VL - 28
SP - 117
EP - 125
JO - Revista Geológica de Chile
JF - Revista Geológica de Chile
SN - 0716-0208
ER -