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Authordc.contributor.authorPinto Lincoñir, Luisa es_CL
Authordc.contributor.authorHérail, Gérard es_CL
Authordc.contributor.authorFontan, Francois es_CL
Authordc.contributor.authorParseval, Philippe de es_CL
Admission datedc.date.accessioned2008-05-14T14:12:14Z
Available datedc.date.available2008-05-14T14:12:14Z
Publication datedc.date.issued2007es_CL
Cita de ítemdc.identifier.citationSEDIMENTARY GEOLOGY Vol. 195 01/03/2001 2007 03/04/2008 217-237es_CL
Identifierdc.identifier.urihttps://repositorio.uchile.cl/handle/2250/124723
General notedc.descriptionPublicación ISIes_CL
Abstractdc.description.abstractRecent studies show that the western margin of the Andean plateau was uplifted during Neogene time in the form of a proto-Western Cordillera through a system of high angle reverse faults. In this study, we use XRD and microprobe data of heavy minerals (HM) contained in Neogene sandstones of the Central Depression and Copaquilla Depression, to the west of the Andean plateau, to better understand the paleogeographical evolution along this border. The composition of detrital metamorphic HM assemblages, e.g. garnet-staurolite and actinolite-epidote, found in the Neogene sandstones, correlates well with that of the HM in the basement. Based on this correlation, we outline the different stages of exhumation and surface exposure of the metamorphic and crystalline basement rocks that crop out along the eastern part of the Copaquilla Depression (Belen area). In addition, the vertical stratigraphic distribution of detrital volcanic HM assemblages, e.g. olivine-pyroxenes and amphibole-biotite, records in detail the evolution of the Neogene volcanism, showing the stages in which volcanics in the Precordillera covered the basement. A first stage of basement exposure took place before 26 Ma. This was followed by Early to Late Miocene (ca. 26-10 Ma) intermediate to andesite-basalt volcanism which led to basement burial. Later on, ca. 10-2.7 Ma, a deep incision of the Precordillera associated with a generalized uplift of the plateau exposed the basement again. (c) 2006 Elsevier B.V. All rights reserved.es_CL
Lenguagedc.language.isoenes_CL
Keywordsdc.subjectAndean plateaues_CL
Area Temáticadc.subject.otherGeologyes_CL
Títulodc.titleNeogene erosion and. uplift of the western edge of the Andean Plateau as determined by detrital heavy mineral analysises_CL
Document typedc.typeArtículo de revista


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