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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. © 2012 Elsevier Ltd.

Registro:

Documento: Artículo
Título:The offshore basement of Perú: Evidence for different igneous and metamorphic domains in the forearc
Autor:Romero, D.; Valencia, K.; Alarcón, P.; Peña, D.; Ramos, V.A.
Filiación:Laboratorio de Tectónica Andina del, Instituto de Estudios Andinos Don Pablo Groeber (UBA-CONICET), Buenos Aires, Argentina
Palabras clave:Collision; Famatinian; Grenville-age; Laurentia; Paracas; Tahuin; Terrane; Alleghanian orogeny; argon-argon dating; basement rock; continental margin; crustal evolution; forearc basin; Grenvillian orogeny; hypothesis testing; magmatism; oceanic crust; Ordovician; Paleozoic; petrography; recrystallization; SHRIMP dating; tectonic evolution; terrane; uranium-lead dating; Peru; Anacardium occidentale
Año:2013
Volumen:42
Página de inicio:47
Página de fin:60
DOI: http://dx.doi.org/10.1016/j.jsames.2012.11.003
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v42_n_p47_Romero

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Citas:

---------- APA ----------
Romero, D., Valencia, K., Alarcón, P., Peña, D. & Ramos, V.A. (2013) . The offshore basement of Perú: Evidence for different igneous and metamorphic domains in the forearc. Journal of South American Earth Sciences, 42, 47-60.
http://dx.doi.org/10.1016/j.jsames.2012.11.003
---------- CHICAGO ----------
Romero, D., Valencia, K., Alarcón, P., Peña, D., Ramos, V.A. "The offshore basement of Perú: Evidence for different igneous and metamorphic domains in the forearc" . Journal of South American Earth Sciences 42 (2013) : 47-60.
http://dx.doi.org/10.1016/j.jsames.2012.11.003
---------- MLA ----------
Romero, D., Valencia, K., Alarcón, P., Peña, D., Ramos, V.A. "The offshore basement of Perú: Evidence for different igneous and metamorphic domains in the forearc" . Journal of South American Earth Sciences, vol. 42, 2013, pp. 47-60.
http://dx.doi.org/10.1016/j.jsames.2012.11.003
---------- VANCOUVER ----------
Romero, D., Valencia, K., Alarcón, P., Peña, D., Ramos, V.A. The offshore basement of Perú: Evidence for different igneous and metamorphic domains in the forearc. J. South Am. Earth Sci. 2013;42:47-60.
http://dx.doi.org/10.1016/j.jsames.2012.11.003