A neoproterozoic age for the chromitite and gabbro of the Tapo Ultramafic Massif, Eastern Cordillera, Central Peru, and its tectonic implications

Tassinari, Colombo G.; Castroviejo Bolibar, Ricardo; Rodrigues, Jose F.; Acosta, Jorge y Pereira, Eurico (2011). A neoproterozoic age for the chromitite and gabbro of the Tapo Ultramafic Massif, Eastern Cordillera, Central Peru, and its tectonic implications. "Journal of South American Earth Sciences", v. 32 (n. 4); pp. 429-437. ISSN 0895-9811. https://doi.org/10.1016/j.jsames.2011.03.008.

Descripción

Título: A neoproterozoic age for the chromitite and gabbro of the Tapo Ultramafic Massif, Eastern Cordillera, Central Peru, and its tectonic implications
Autor/es:
  • Tassinari, Colombo G.
  • Castroviejo Bolibar, Ricardo
  • Rodrigues, Jose F.
  • Acosta, Jorge
  • Pereira, Eurico
Tipo de Documento: Artículo
Título de Revista/Publicación: Journal of South American Earth Sciences
Fecha: Diciembre 2011
Volumen: 32
Materias:
Escuela: E.T.S.I. Minas (UPM) [antigua denominación]
Departamento: Ingeniería Geológica [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

The ultramafic-mafic rocks of the Tapo Complex are exposed in the Eastern Cordillera of the Central Peruvian Andes. This complex is composed of serpentinised peridotites and metabasites with some podiform chromitite lenses and chromite disseminations and overlies the sandstones, conglomerates, and tuffs of the Carboniferous Ambo Group. The metagabbros and amphibolites showa tholeiitic affiliation and a flat REE spider diagram, with a slight LREE depletion and a positive Eu anomaly suggesting magmatic accumulation of plagioclase, in an ocean ridge or ocean island environment. Sm-Nd isotopic analyses were performed on chromite as well as on whole rock from the gabbro. All samples yielded an Sm-Nd isochrone age of718 ± 47 Ma with an initial 143Nd/l44Nd of0.51213 ± 0.00005. The Nd (718 Ma) values calculated for both chromite and gabbro are in close agreement, around 8.0, implying that they were formed at the same time from the same mantelic magma source. Furthermore a K-Ar age on amphibole of 448 ± 26 Ma was obtained, interpreted as the cooling age of a younger orogenic event. These rocks represent slices of oceanic crust (from a dismembered ophiolitic complex), metamorphosed and later overthrust on upper Palaeozoic continental formations.

Más información

ID de Registro: 10216
Identificador DC: http://oa.upm.es/10216/
Identificador OAI: oai:oa.upm.es:10216
Identificador DOI: 10.1016/j.jsames.2011.03.008
URL Oficial: http://www.journals.elsevier.com/journal-of-south-american-earth-sciences/
Depositado por: Biblioteca ETSI Minas y Energía
Depositado el: 03 Feb 2012 09:10
Ultima Modificación: 20 Abr 2016 18:27
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