High pressure metamorphic conditions in garnet amphibolite from a collisional shear zone related to the Tapo ultramafic body, Eastern Cordillera of Central Peru

Willner, Arne P.; Castroviejo Bolibar, Ricardo; Rodrigues, Jose F.; Acosta, Jorge y Rivera Feijóo, Miguel (2010). High pressure metamorphic conditions in garnet amphibolite from a collisional shear zone related to the Tapo ultramafic body, Eastern Cordillera of Central Peru. En: "XV Congreso Peruano de Geología", 27/09/2010 - 01/10/2010, Cuzco, Perú.

Descripción

Título: High pressure metamorphic conditions in garnet amphibolite from a collisional shear zone related to the Tapo ultramafic body, Eastern Cordillera of Central Peru
Autor/es:
  • Willner, Arne P.
  • Castroviejo Bolibar, Ricardo
  • Rodrigues, Jose F.
  • Acosta, Jorge
  • Rivera Feijóo, Miguel
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 discontinuos belt of elongated ultramafic rock bodies (mostly serpentinites) occurs in the Eastern Cordillera of the central Peruvian Andes. One of the main occurrences is the Tapo Massif, a lense-shaped serpentinite body, ~2 km x 5 km, comprising small podiform chromitite deposits (Castroviejo et al., 2009) and bands or lenses of garnet-amphibolite, both strongly sheared and thrust upon the upper Paleozoic sediments of the Ambo Group (Fig. 1). Metabasite geochemistry suggests a mid-ocean ridge or an ocean island protolith. The whole sequence can be interpreted as a disrupted ophiolitic complex (Castroviejo et al., 2010). The geological setting of the Tapo occurrence is described by J.F. Rodrigues et al. (2010). To get information about its geotectonic setting we applied new geothermobarometric techniques to the garnet amphibolite. Finding representative samples with an adequate mineralogy to apply these techniques is in this case a difficult task. A common problem is the almost ubiquitous overprinting by serpentinisation or retrograde metamorphism and, locally, by metasomatism or alteration enhanced by deformation, producing a variety of rock types, as rodingites, birbirites and listvaenites. Nevertheless, careful sampling followed by petrographic examination of the rocks allowed to identify some samples in which useful assemblages are present.

Más información

ID de Registro: 7283
Identificador DC: http://oa.upm.es/7283/
Identificador OAI: oai:oa.upm.es:7283
URL Oficial: http://www.congresosgp.com/
Depositado por: Memoria Investigacion
Depositado el: 31 May 2011 08:39
Ultima Modificación: 20 Abr 2016 16:27
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