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Horizon / Pleins textes
Other literature type . 1996
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Journal of South American Earth Sciences
Article . 1996 . Peer-reviewed
License: Elsevier TDM
Data sources: Crossref
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DIGITAL.CSIC
Article . 2021
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Pampa del Palo: an anomalous composite marine terrace on the uprising coast of southern Peru

Authors: /Ortlieb, Luc; Zazo, C.; Goy, J.L.; Dabrio, C.; Macharé, J.;

Pampa del Palo: an anomalous composite marine terrace on the uprising coast of southern Peru

Abstract

[EN] Quaternary sediments along the southern Peruvian coast occur as staircase terraces of coastal and shallow-marine deposits in response to continuous uplift related to the active boundary between the Nazca and South-American plates. However, near Ilo (in the same coastal stretch) the emergent Pampa del Palo terrace consists of a relatively-thick, vertical stack of shallow-marine, coastal and lagoonal deposits that indicate a rather different geodynamic behaviour. Coastal deposits are correlatable with the successive marine highstands of isotopic stages 7 (?) and 5 (substages 5e and 5c). Combining aerial photo-interpretation, geomorphological mapping, sedimentological analysis, chronostratigraphical data, and structural observations, the Pampa del Palo feature is interpreted as a faulted block that moved independently of the remaining southern Peruvian coast and, for some time between the end of Middle Pleistocene (before ca. 220 ka) and the early Late Pleistocene (ca. 120 ka), it rose more slowly or was even down-faulted relative to the rest of the southern Peruvian margin. The independent block movements ceased after substage 5e, when the Pampa del Palo "terrace" was incorporated into the regional uplift of the area. Since ca. 100 ka, measured uplift rates in the Ilo area amounted up to 160 mm/103y when the area has been affected by a few active, NE-SE trending faults only. [ES] Los sedimentos cuaternarios aparecen a lo largo de la costa sur del Perú como terrazas escalonadas y encajadas, con sedimentos sublitorales y costeros, en respuesta al continuo levantamiento de la zona de contacto activo entre las placas de Nazca y Sudamérica. Sin embargo, cerca de Ilo (en ese mismo sector costero) la terraza emergida de la Pampa del Palo contiene un registro relativamente potente de sedimentos marinos someros, costeros y lagoonales, apilados verticalmente, lo cual pone de manifiesto un comportamiento geodinámico bastante diferente. Estos depósitos marinos son correlacionables con los sucesivos niveles altos del mar correspondientes a los estadios isotópicos 7 (?) y 5 (subestadios 5e y 5c). Combinando la interpretación fotogeológica, la cartografía geomorfológica, el análisis sedimentológico, los datos cronoestratigráficos y las observaciones estructurales, la terraza de la Pampa del Palo se interpreta como un bloque de falla que se movió independientemente de la restante costa del Perú durante cierto tiempo entre finales del Pleistoceno Medio (antes de unos 220 ka) y comienzos del Pleistoceno Superior (unos 120 ka), ascendiendo más lentamente o incluso descendiendo. El movimiento como bloque independiente cesó tras el subestadio 5e, cuando el bloque quedó de nuevo incorporado al ascenso general. Desde hace unos 100 ka, las tasas medidas de ascenso en la región de Ilo (incluyendo el bloque de la Pampa del Palo) llegan a . Desde entonces sólo han actuado en el área unas pocas fracturas de dirección NE-SE.

Countries
Spain, France
Keywords

FAILLE, QUATERNAIRE, 550, ZONE COTIERE, NEOTECTONIQUE, GEOMORPHOLOGIE, STRATIGRAPHIE, PALEOENVIRONNEMENT, TERRASSE MARINE, SEDIMENTATION LITTORALE, GEOCHRONOLOGIE

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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