Flexural isostasy in the Bolivian Andes: Chaco foreland basin development
The Chaco foreland basin was initiated during the late Oligocene as a result of thrusting in the Eastern Cordillera in response to Nazca-South America plate convergence. Foreland basins are the result of the flexural isostatic response of an elastic plate to orogenic and/or thrust sheet loading. We...
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todo:paper_00401951_v474_n3-4_p526_Prezzi2023-10-03T14:50:14Z Flexural isostasy in the Bolivian Andes: Chaco foreland basin development Prezzi, C.B. Uba, C.E. Götze, H.-J. Basin development Central Andes Chaco foreland Flexural isostasy Flexural modelling Basin development Central Andes Chaco foreland Flexural isostasy Flexural modelling Geodesy Plates (structural components) Sedimentology Tectonics basin evolution elastic property foreland basin gravity anomaly isostasy Moho Oligocene thrust Andes South America The Chaco foreland basin was initiated during the late Oligocene as a result of thrusting in the Eastern Cordillera in response to Nazca-South America plate convergence. Foreland basins are the result of the flexural isostatic response of an elastic plate to orogenic and/or thrust sheet loading. We carried out flexural modelling along a W-E profile (21.4°S) to investigate Chaco foreland basin development using new information on ages of foreland basin strata, elastic and sedimentary thicknesses and structural histories. It was possible to reproduce present-day elevation, gravity anomaly, Moho depth, elastic thicknesses, foreland sedimentary thicknesses and the basin geometry. Our model predicted the basin geometry and sedimentary thicknesses for different evolutionary stages. Measured thicknesses and previously proposed depozones were compared with our predictions. Our results shed more light on the Chaco foreland basin evolution and suggest that an apparent decrease in elastic thickness beneath the Eastern Cordillera and the Interandean Zone could have occurred between 14 and 6 Ma. © 2009 Elsevier B.V. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00401951_v474_n3-4_p526_Prezzi |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Basin development Central Andes Chaco foreland Flexural isostasy Flexural modelling Basin development Central Andes Chaco foreland Flexural isostasy Flexural modelling Geodesy Plates (structural components) Sedimentology Tectonics basin evolution elastic property foreland basin gravity anomaly isostasy Moho Oligocene thrust Andes South America |
| spellingShingle |
Basin development Central Andes Chaco foreland Flexural isostasy Flexural modelling Basin development Central Andes Chaco foreland Flexural isostasy Flexural modelling Geodesy Plates (structural components) Sedimentology Tectonics basin evolution elastic property foreland basin gravity anomaly isostasy Moho Oligocene thrust Andes South America Prezzi, C.B. Uba, C.E. Götze, H.-J. Flexural isostasy in the Bolivian Andes: Chaco foreland basin development |
| topic_facet |
Basin development Central Andes Chaco foreland Flexural isostasy Flexural modelling Basin development Central Andes Chaco foreland Flexural isostasy Flexural modelling Geodesy Plates (structural components) Sedimentology Tectonics basin evolution elastic property foreland basin gravity anomaly isostasy Moho Oligocene thrust Andes South America |
| description |
The Chaco foreland basin was initiated during the late Oligocene as a result of thrusting in the Eastern Cordillera in response to Nazca-South America plate convergence. Foreland basins are the result of the flexural isostatic response of an elastic plate to orogenic and/or thrust sheet loading. We carried out flexural modelling along a W-E profile (21.4°S) to investigate Chaco foreland basin development using new information on ages of foreland basin strata, elastic and sedimentary thicknesses and structural histories. It was possible to reproduce present-day elevation, gravity anomaly, Moho depth, elastic thicknesses, foreland sedimentary thicknesses and the basin geometry. Our model predicted the basin geometry and sedimentary thicknesses for different evolutionary stages. Measured thicknesses and previously proposed depozones were compared with our predictions. Our results shed more light on the Chaco foreland basin evolution and suggest that an apparent decrease in elastic thickness beneath the Eastern Cordillera and the Interandean Zone could have occurred between 14 and 6 Ma. © 2009 Elsevier B.V. All rights reserved. |
| format |
JOUR |
| author |
Prezzi, C.B. Uba, C.E. Götze, H.-J. |
| author_facet |
Prezzi, C.B. Uba, C.E. Götze, H.-J. |
| author_sort |
Prezzi, C.B. |
| title |
Flexural isostasy in the Bolivian Andes: Chaco foreland basin development |
| title_short |
Flexural isostasy in the Bolivian Andes: Chaco foreland basin development |
| title_full |
Flexural isostasy in the Bolivian Andes: Chaco foreland basin development |
| title_fullStr |
Flexural isostasy in the Bolivian Andes: Chaco foreland basin development |
| title_full_unstemmed |
Flexural isostasy in the Bolivian Andes: Chaco foreland basin development |
| title_sort |
flexural isostasy in the bolivian andes: chaco foreland basin development |
| url |
http://hdl.handle.net/20.500.12110/paper_00401951_v474_n3-4_p526_Prezzi |
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