RT Journal Article
T1 Datos preliminares sobre el metamorfismo de la Sierra de Pie dePalo, Sierras Pampeanas Occidentales (Argentina)
A1 Baldo, Edgardo G.
A1 Casquet, César
A1 Galindo Francisco, Mª del Carmen
AB The Sierra de Pie de Palo belongs to the Western Sierras Pampeanas. Although still poorly known indetail, the sierra consists of a relatively autochthonous sequence of shelf sediments metamorphosed tolow grade (the Caucete Group) and an allochthonous complex of polymetamorphic medium-to-highgrade 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 tectonothermalevents 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 arerecognized: 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 theGrenville orogeny and Mmyl to the Famatinian orogeny.
PB Sociedad Geológica de España
SN 0213-683X
YR 1998
FD 1998
LK https://hdl.handle.net/20.500.14352/56926
UL https://hdl.handle.net/20.500.14352/56926
LA eng
DS Docta Complutense
RD 8 may 2024