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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. es_PE
dc.contributor.author Barron J.A. es_PE
dc.contributor.author Urbina-Schmitt M. es_PE
dc.contributor.author Ochoa D. es_PE
dc.contributor.author Esperante R. es_PE
dc.contributor.author Snee L.W. es_PE
dc.date.accessioned 2024-05-30T23:13:38Z
dc.date.available 2024-05-30T23:13:38Z
dc.date.issued 2021
dc.description JAB received funding from the United States Geological Survey , Climate Research and Development Program , for this study. DO was supported by CONCYTEC (Peru) research grants CB ( N° 105-2018 - FONDECYT ) and “Incorporación de Investigadores” ( N° E038-2019-02-FONDECYT-BM ). RE was supported by Geosciences Research Institute grant GRI19-1 . LWS was supported as an employee of the United States Geological Survey during the 1980s. TJD and MU did not receive any grant from funding agencies in the public, commercial, or not-for-profit sectors.
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. © 2021 Elsevier Ltd
dc.description.sponsorship Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica - Concytec
dc.identifier.doi https://doi.org/10.1016/j.jsames.2021.103458
dc.identifier.scopus 2-s2.0-85111970376
dc.identifier.uri https://hdl.handle.net/20.500.12390/3064
dc.language.iso eng
dc.publisher Elsevier Ltd
dc.relation.ispartof Journal of South American Earth Sciences
dc.rights info:eu-repo/semantics/openAccess
dc.subject Pisco formation
dc.subject Chilcatay formation es_PE
dc.subject Diatoms es_PE
dc.subject East Pisco Basin es_PE
dc.subject Miocene es_PE
dc.subject Olistostrome es_PE
dc.subject Peru es_PE
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#2.07.01
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)
dc.type info:eu-repo/semantics/article
dspace.entity.type Publication
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