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• W2165539294 abstract "The geologi e process es that concemed the Andean uplift and related basins in the northwest of Argentina from middle Miocene to Recent are quite weil known. Before this period, the manner in which the Palaeogene postrift basin evolved to the foreland basin and mainly, in which moment this transformation took place, are still uncertain . In this contribution new stratigraphie and structural data from the Valle Calchaqui are presented. These elements provide information to assess the initial stages of foreland basin and the structures related with the Central Andes uplift. The Valle Calchaqui is a north-south depress ion and constitutes the limit between the Puna Plateau to the west and the Cordillera Oriental to the east (Fig. )a). In the northe rn Valle Calchaqul, a red coarsening up-ward success ion of continental strata of 1.500 m of mean thickness, repres ents the foreJand sedimentation. This depo sits overli e the postr ift sediments of Salta Group (Fig.1 b). The sedim entary facies and the stratigraphi e position make it poss ible to correlate this succession with the Quebrada de Los Colorados Formation, identified by Diaz et al (19 87) to the south of the valley. This unit represents the initial sedimentation of the foreland basin and its age is still unknown. A Paleogene age is estimated in relation to its stratigraphie position, underlying Angastaco Formation, which is dated middle Miocene by its paleontological record and a Ar/Ar radimentr ic age of 13.04 Ma (Diaz & Malizzia., 1984; Grier & Dallmey er, 1990) and by correlation with Gestes Formation (Marrett, 1990) which is bearer of Palaeogene mammals . The prelim inary study of vertebrate fossils (mainly notoungul ate mammals) suggests an Eocene age for this unit. Two stratigraphie logs, located one in the northernmost area of the Valle Calchaqui, El Saladillo and the other situated to the south of La Poma town, Cerro Bayo, distant each othe r 24 km were studied (Fig. 1a). Based on the characteristics of the facies associ ation , the pattern of fluvial fac ies and the paleocurrent and provenance analysis, five sedimentary sequences were recogni sed. The basal sequences (la, lb and le) are integrated by fine­ grained facies, sheet-like sandstones and paleosols. The middle sequences (II and III) are constituted by intermedi ate participation of fine-grained sediments and channel-fiIl conglomerate sandstones facies. The upper sequences (IV and V) consist of mudflow deposits and coarse conglomerate channel-fill facies. ln El Saladillo area, the clasts composition of sequen ces la, lb and Ic indicates a source -area from granite and sedimentary rocks. The sequences Il and III show a main proven ance from metamorphic basement and the sequenc es [V and V, in addition to the mentioned ones, from volcanic and limestone rocks. Despite the heterogeneity in the composition of the source- area, the paleo current study reveals a main provenance from the north (Fig. 1b) with minor and local variation." @default.
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• W2165539294 date "2005-01-01" @default.
• W2165539294 modified "2023-09-27" @default.
• W2165539294 title "Stratigraphy and syndepositional structures of the basal foreland deposits in the northern Valle Calchaqui, NW Argentina" @default.
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