RT Journal Article
T1 Datos preliminares sobre el metamorfismo de la Sierra de Pie de Palo, Sierras Pampeanas Occidentales (Argentina)
T1 Preliminary dala un llie meLamorphism of Sierra de Pié de Palo, Western Pampean Sierras (Argentina)
A1 Baldo, Edgardo G.
A1 Casquet Martín, César
A1 Galindo, Carmen
AB The 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, 40Ar/39Ar and K-Ar) suggests that at least two tectono-thermal events are present in the allochthonous: Grenville (ca. 1Ga) 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, III, 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 6002C). The second is related to mylonitization (Mmy|) with T ~ 575eC and P <10kb. We suggest that this rock is polymetamorphic, M, metamorphism being probably related to the Grenville orogeny and Mmy| to the Famatinian orogeny
PB Sociedad Geológica de España
YR 1997
FD 1997
LK http://hdl.handle.net/10272/10216
UL http://hdl.handle.net/10272/10216
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 1 jun 2026