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Forearc deformation of the Peruvian rnargin: Quantify'ing the rates of Quaternary deformation in pediment surfaces using in situ-produced cosmogenic 10Be and 26Al
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hall, Sarah R. Farber, Daniel L. Audin, Laurence Mériaux, Anne-Sophie |
| Copyright Year | 2005 |
| Abstract | While the classical concept of an Andean style continental margin is commonly used in the geological literature to describe orogenesis in oceanic - continental collision zones, the quantification of the driving forces and the structures that accommodate the uplift of the Andean Cordillera remains an enigmatic and outstanding scientific issue. In this setting, the overall driving force for the deformation is derived from coupling between the subducting oceanic and overriding continental plate. Furthermore, temporal changes in the subduction angle may have profoundly modified both the degree of coupling as well as the strength of the South American lithosphere. However, detailing the tectonic effects of these changes in subduction style is difficult to quantify. The modem along-strike variations of subduction style along the South American margin can provide a naturallaboratory for studying the effects of differing subduction geometries. In particular, two end-rnodel geometries are clearly expressed along the Peruvian margin where fIat subduction affects northern Pern, while southern Pern is characterized by more normal subduction angles. The transition region between these two end members lies at about 14°S near the Pisco deflection. Recent studies have highlighted active deforrnation, specifically extension, related to uplift in the forearc of this region (Audin et al, 2003, Hartley et al., 2000, Husson and Sempere, 2003) but have not quantified the rates or timing of this deformation. Fortunately, along this portion of the Peruvian margin there exist, well-preserved sequences of old pediment surfaces and marine terra ces that form a unique set of datable markers that can be used to quantify the rates of Quaternary coastal uplift associated with the subduction of the Nazca plate beneath the South American plate. |
| Starting Page | 358 |
| Ending Page | 359 |
| Page Count | 2 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers09-03/010040247.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
