Neoproterozoic ultramafic and mafic magmatism in the Eastern Cordillera of the central peruvian Andes: the Tapo Massif

Tassinari, Colombo G.; Castroviejo Bolibar, Ricardo; Rodrigues, Jose F.; Acosta, Jorge y Pereira, Eurico (2010). Neoproterozoic ultramafic and mafic magmatism in the Eastern Cordillera of the central peruvian Andes: the Tapo Massif. En: "XV Congreso Peruano de Geología", 27/09/2010 - 01/10/2010, Cuzco, Perú.

Descripción

Título: Neoproterozoic ultramafic and mafic magmatism in the Eastern Cordillera of the central peruvian Andes: the Tapo Massif
Autor/es:
  • Tassinari, Colombo G.
  • Castroviejo Bolibar, Ricardo
  • Rodrigues, Jose F.
  • Acosta, Jorge
  • Pereira, Eurico
Tipo de Documento: Ponencia en Congreso o Jornada (Artículo)
Título del Evento: XV Congreso Peruano de Geología
Fechas del Evento: 27/09/2010 - 01/10/2010
Lugar del Evento: Cuzco, Perú
Título del Libro: Actas de XV Congreso Peruano de Geología
Fecha: 2010
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

A highly dismembered assemblage of ultramafic and mafic rocks is exposed in the Eastern Cordillera of the Central Peruvian Andes, extending along a discontinuous NW-SE belt over some 250 km between 12° and 9° S of latitude. One of the most important occurrences is the Tapo Mafic-Ultramafic Complex, which occurs at 3750 to 4200 m above sea level, 2 km to the west of Tapo locality, in the Tarma province, about 200 Km west of Lima. The Tapo complex is a lens-shaped body, 5 km long and 1-2 km wide, that consists mainly of strongly serpentinized peridotites and some gabbros. Several small open pits won chromite from podiform chromitite lenses ( ≥60 chromite) and from disseminated chromite in serpentinite. The main structural trend of the Tapo Complex is NW – SE and the massif is tectonically emplaced upon Lower Carboniferous sedimentary rocks. The rocks of the Tapo massif are overprinted by metamorphism reaching amphibolite facies (see Willner et al, 2010, for more information on the metamorphic conditions). The main purpose of this work is to constrain the age determination of the Tapo Complex, using Sm-Nd technique direct dating of chromites and, also, amphibole, plagioclase and whole-rock samples from the host gabbro. In addition K-Ar age determination on amphibole is presented to date the metamorphic overprint.

Más información

ID de Registro: 7282
Identificador DC: http://oa.upm.es/7282/
Identificador OAI: oai:oa.upm.es:7282
URL Oficial: http://www.congresosgp.com/
Depositado por: Memoria Investigacion
Depositado el: 31 May 2011 08:51
Ultima Modificación: 20 Abr 2016 16:27
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