Datos preliminares sobre el metamorfismo de la Sierra de Pie de Palo, Sierras Pampeanas Occidentales (Argentina)

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dc.contributor.authorBaldo, Edgardo G.
dc.contributor.authorCasquet Martín, César
dc.contributor.authorGalindo Francisco, María Del Carmen
dc.date.accessioned2023-06-20T16:46:15Z
dc.date.available2023-06-20T16:46:15Z
dc.date.issued1998
dc.description.abstractThe Sierra de Pie de Palo belongs to the Western Sierras Pampeanas. Although still poorly known in detail, the sierra consists of a relatively autochthonous sequence of shelf sediments metamorphosed to low grade (the Caucete Group) and an allochthonous complex of polymetamorphic medium-to-high grade igneous and sedimentary rocks thrust towards the west and northwest. Mylonitization is widespread. Radiometric dating by different methods (U-Pb, 4°Ar/39Ar and K-Ar) suggests that at least two tectonothermal events are present in the allochthonous: Grenville (ca. 1 Ga) and Famatinian (480-312Ma). Metamorphism has been studied in a Ca-rich pelite with a complex mineralogical composition (Qtz, Ms, Pg, Bt, Grt, Ky, Hbl, St, Rt, 111, PI, Ep). This rock is a mylonite. Three metamorphic stages are recognized: the first two correspond to a prograde M, metamorphism under relatively high P/T conditions (peak at 13kb and about 600ºC). The second is related to mylonitization (Mm 1) with T - 575ºC and P < 1 Okb. We suggest that this rock is polymetamorphic, M, metamorphism beirig probably related to the Grenville orogeny and Mmyl to the Famatinian orogeny.
dc.description.departmentDepto. de Mineralogía y Petrología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/11462
dc.identifier.issn0213-683X
dc.identifier.officialurlhttp://www.sociedadgeologica.es/publicaciones_geogaceta.html
dc.identifier.urihttps://hdl.handle.net/20.500.14352/56926
dc.journal.titleGeogaceta
dc.language.isoeng
dc.page.final42
dc.page.initial39
dc.publisherSociedad Geológica de España
dc.rights.accessRightsopen access
dc.subject.cdu552(238)
dc.subject.keywordHigh-pressure metamorphism
dc.subject.keywordCa-rich pelites
dc.subject.keywordGeocronology
dc.subject.keywordSierra de Pie de Palo
dc.subject.keywordSierras Pampeanas Occidentales
dc.subject.keywordArgentina
dc.subject.ucmPetrología
dc.titleDatos preliminares sobre el metamorfismo de la Sierra de Pie de Palo, Sierras Pampeanas Occidentales (Argentina)
dc.typejournal article
dc.volume.number24
dspace.entity.typePublication
relation.isAuthorOfPublicationa4fea134-2fb2-4157-9dd1-a3d6002ba005
relation.isAuthorOfPublicationf2fb71b6-b7fd-4fc6-bf39-d4de3ba5a67c
relation.isAuthorOfPublication.latestForDiscoverya4fea134-2fb2-4157-9dd1-a3d6002ba005
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