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dc.contributor.author
Romero, Darwin
dc.contributor.author
Valencia, Kiko
dc.contributor.author
Alarcón, Pedro
dc.contributor.author
Peña, Daniel
dc.contributor.author
Ramos, Victor Alberto
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dc.date.available
2017-01-17T17:48:45Z
dc.date.issued
2013-02
dc.identifier.citation
Romero, Darwin; Valencia, Kiko; Alarcón, Pedro; Peña, Daniel; Ramos, Victor Alberto; The offshore basement of Perú: evidence for different igneous and metamorphic domains in the forearc; Elsevier; Journal Of South American Earth Sciences; 42; 2-2013; 47-60
dc.identifier.issn
0895-9811
dc.identifier.uri
http://hdl.handle.net/11336/11474
dc.description.abstract
As a result of new studies carried out in the offshore of Perú during the exploration and hydrocarbon evaluation of the forearc basins, new U–Pb SHRIMP and TIMS in zircons and some Ar–Ar data were obtained in the metamorphic and igneous basement. The understanding of this basement was critical to evaluate different hypotheses that have been proposed for the tectonic evolution of pre-Andean crust of Perú. Recent research performed in the basement rocks of the Marañón Massif in northern Perú, claimed that west of this area was a basement-free region in the Paleozoic, where the arc and forearc were developed in a mafic quasi-oceanic crust. However, petrographic studies and new preliminary ages indicate, for the first time, the nature and age of this sialic basement. Reconnaissance studies were performed in several offshore islands, as the Las Hormigas de Afuera Island west of Lima, and Macabí and Lobera islands along the edge of the continental platform. These data were complemented with the studies of some cutting samples obtained in recent exploration wells in northern Perú. The results of the present work show two large crustal domains in the Peruvian offshore forearc. A northern domain contains late Paleozoic igneous rocks that appear to be the southern offshore continuation of the Amotape–Tahuin block, which is interpreted as the southernmost remnant of the Laurentia Alleghenian orogen. The central offshore domain, known as the Paracas High, corresponds to the outer shelf high of previous studies. It contains orthogneisses of Grenville-age, probably recrystallized during an Ordovician magmatic episode. The new results show that the central offshore of Perú is an extension of the Grenville-age basement affected by Famatinian, early Paleozoic magmatism, well exposed in the southern domain in the Arequipa Massif along the coast of southern Perú.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
Grenville
dc.subject
Paracas
dc.subject
Tahuin
dc.subject
Laurentia
dc.subject.classification
Geología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
The offshore basement of Perú: evidence for different igneous and metamorphic domains in the forearc
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-12-12T21:06:00Z
dc.journal.volume
42
dc.journal.pagination
47-60
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Romero, Darwin. Savia Peru S.A; Perú
dc.description.fil
Fil: Valencia, Kiko. Savia Peru S.A; Perú
dc.description.fil
Fil: Alarcón, Pedro. Savia Peru S.A; Perú
dc.description.fil
Fil: Peña, Daniel. Savia Peru S.A; Perú
dc.description.fil
Fil: Ramos, Victor Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
dc.journal.title
Journal Of South American Earth Sciences
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0895981112001538
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jsames.2012.11.003
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