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| URI | http://purl.tuc.gr/dl/dias/97FE298E-71B9-4B0B-8E32-2B12684C2588 | - |
| Αναγνωριστικό | https://doi.org/10.1016/S0895-9811(97)00001-1 | - |
| Γλώσσα | en | - |
| Μέγεθος | 19 pages | en |
| Τίτλος | Pre-Andean and Andean-Age Deformation in the eastern Cordillera of southern Bolivia | en |
| Δημιουργός | Manoutsoglou Emmanouil | en |
| Δημιουργός | Μανουτσογλου Εμμανουηλ | el |
| Δημιουργός | Joachim P. Müller Chevron | en |
| Δημιουργός | Jonas Kley Geo | en |
| Δημιουργός | Jacobshagen, Volker | en |
| Εκδότης | Elsevier | en |
| Περίληψη | The Eastern Cordillera of southern Bolivia is situated between the Altiplano high plateau in the west and the thin-skinned Subandean thrust belt in the east. It is mainly built of Ordovician anchimetamorphic sedimentary rocks with a discontinuous, unconformable cover of Cretaceous to Neogene, mostly continental sediments. The eastern margin of the Eastern Cordillera exhibits E-verging basement-involved thrusts linked to the Subandean belt. Its central and western parts, discussed in this paper, represent a province of dominantly W-verging, basement-involved thrusts of Tertiary age superimposed on a deeply eroded pre-Cretaceous fold belt. Several well-preserved remnants of the pre-Cretaceous fold belt show kilometer-scale, W-verging folds with axial plane slaty cleavage. The main activity of Andean (post-Cretaceous) thrusts is bracketed between about 25 and 12 Ma. However, some Andean contractional deformation occurred earlier. The exposed major Andean thrusts dip steep to intermediately at the surface. Cross-section balancing suggests that they merge into a detachment at maximum depths of 9 to 17 km. Neogene shortening is concentrated in an imbricated thrust system at the border of the Eastern Cordillera with the Altiplano in the west, but is relatively moderate (about 10-15%) within the Eastern Cordillera itself. W-verging thrusts in the Eastern Cordillera predate the E-verging thrust belt which underlies the eastern flank of the Andes. Strain rates are comparatively low during these first stages of deformation, but increase markedly at the onset of thin-skinned thrusting farther east. Balancing of a regional cross-section of 150 km present length indicates that the western and central Eastern Cordillera has shortened by about 55-80 km since Cretaceous time. Overall Tertiary tectonic shortening between the deformation front and the magmatic arc is about 215-250 km. This is insufficient to build the entire crustal root of the Andes by thrust thickening alone. | en |
| Τύπος | Peer-Reviewed Journal Publication | en |
| Τύπος | Δημοσίευση σε Περιοδικό με Κριτές | el |
| Άδεια Χρήσης | http://creativecommons.org/licenses/by/4.0/ | en |
| Ημερομηνία | 2015-10-31 | - |
| Ημερομηνία Δημοσίευσης | 1997 | - |
| Θεματική Κατηγορία | Geology--Surveys | en |
| Θεματική Κατηγορία | geological surveys | en |
| Θεματική Κατηγορία | geology surveys | en |
| Βιβλιογραφική Αναφορά | J. Kley, J. Müller, S. Tawackoli, V. Jacobshagen, E. Manutsoglu ,"Pre-Andean and Andean-age deformation in the Eastern Cordillera of southern Bolivia,"J. of South Am. Earth Sciences, vol. 10, no.1, Pages 1–19,Jan. 1997.doi:10.1016/S0895-9811(97)00001-1 | en |
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