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An introduction to geology of the Precordillera, Western Argentina
| Content Provider | Semantic Scholar |
|---|---|
| Author | Peralta, Silvio H. |
| Copyright Year | 2015 |
| Abstract | The Precordillera of Western Argentina (See figure 1 for location) constitute a typical "thinskinned" high level thrust-and-fold belt, which was formed during the Andean (Tertiary) crustal shortening, where mostly E-directed imbrications are combined with folding and involve a pile of Cambrian to Tertiary sediments. The thrust belt is detached above a main décollement within the Ordovician to Lower Devonian strata. To the East it is bounded by a back thrust zone directed westwards, mean-while to the West it is bounded by a tectonic valley alignment trending N-S, separating from the adjacent Cordillera Frontal (Figure 2). On the other side no Precambrian basement rocks are exposed in the Argentine Precordillera, it being probably that the basement is composed of metamorphic rocks which can be inferred from xenoliths found in Tertiary volcanic rocks, which indicate a Grenville-age, ~ 1100 Ma, which allow a strong relationship between Precordillera and Appalachian basements, and so, to consider the Precordillera as a continental fragment rifted from Laurentia (Astini et al.,1995). Indeed, Dalla Salda et al. (1993) propose that the Laurentian origin of Precordillera is because the Taconian Gondwana-Laurentia collision, which resulted the Occidentalia Terrane, trending along the Andes from the Northern Chile to Patagonia, and the related Famatinian orogen. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://insugeo.org.ar/publicaciones/docs/misc-06-04.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
