Universidad Peruana Cayetano Heredia

The Miocene stratigraphy of the Laberinto area (Río Ica Valley) and its bearing on the geological history of the East Pisco Basin (south-central Peru)

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dc.contributor.author DeVries, T.J.
dc.contributor.author Barron, J.A.
dc.contributor.author Urbina-Schmitt, M.
dc.contributor.author Ochoa, Diana
dc.contributor.author Esperante, R.
dc.contributor.author Snee, L.W.
dc.date.accessioned 2021-10-04T23:01:01Z
dc.date.available 2021-10-04T23:01:01Z
dc.date.issued 2021
dc.identifier.uri https://hdl.handle.net/20.500.12866/9900
dc.description.abstract Global sea-level changes and substantial vertical displacement along the Monte Grande Fault (MGF) in the lower Río Ica Valley of south-central Peru influenced the accumulation of bioclast-bearing and diatom-bearing Miocene siliciclastic sediments in an area of the East Pisco forearc basin (EPB) colloquially known as Laberinto. Two depositional hiatuses in the Laberinto area (~17–14 Ma, ~12.5–10 Ma) manifest as sediment-filled erosional depressions a few kilometers in breadth. Erosion of the older depression was preceded by an ~18-Ma massive debris flow, possibly triggered by motion on the MGF causing lower Miocene lithoclastic olistoliths of up to two hundred meters length to spill off the footwall block. Sediment shed from the same footwall block may have formed previously recognized early Miocene deltas. From 14 to 13 Ma, the older depression filled with sediments herein assigned to the provisionally named Laberinto, Pampa, and Naranja members of the Pisco Formation, the latter member being characterized by marine delta foreset beds. The three members are at least partly correlative with the Pisco-0 sequence of the Pisco Formation. The younger depression was overrun at 10 Ma by debris flows of lithoclastic and granitic cobbles and boulders, then filled with diatomaceous silty sand with 5-m-sized lithoclastic olistoliths. The two lithologies constitute the provisionally named Mature Formation. Radiometric and newly revised biochronological data from throughout the EPB coupled with new diatom data from the Laberinto area have provided new insights into the correlation of sequences within the Chilcatay and Pisco formations and the interaction of local and basin-wide tectonism and global eustatic sea-level events across the basin en_US
dc.language.iso eng
dc.publisher Elsevier
dc.relation.ispartofseries Journal of South American Earth Sciences
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject Bacillariophyta en_US
dc.subject Chilcatay formation en_US
dc.subject Citrus sinensis en_US
dc.subject Diatoms en_US
dc.subject East Pisco Basin en_US
dc.subject Miocene en_US
dc.subject Olistostrome en_US
dc.subject Peru en_US
dc.subject Pisco formation en_US
dc.title The Miocene stratigraphy of the Laberinto area (Río Ica Valley) and its bearing on the geological history of the East Pisco Basin (south-central Peru) en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1016/j.jsames.2021.103458
dc.relation.issn 1873-0647


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