Have the southernmost Andes been curved since Late Cretaceous time? An analog test for the Patagonian Orocline
The kinematic evolution of the enigmatic arc-shaped southernmost Andes of Patagonia and Tierra del Fuego has been a subject of debate for most of the past century. We compared the results from analog sandbox experiments with the tectonic evolution and actual configuration of the mountain chain in or...
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2007
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00917613_v35_n1_p13_Ghiglione http://hdl.handle.net/20.500.12110/paper_00917613_v35_n1_p13_Ghiglione |
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paper:paper_00917613_v35_n1_p13_Ghiglione |
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paper:paper_00917613_v35_n1_p13_Ghiglione2023-06-08T15:08:11Z Have the southernmost Andes been curved since Late Cretaceous time? An analog test for the Patagonian Orocline Arcurate structures Oroclines Patagonian Andes Sand analog experiments Tierra del Fuego Oroclinal rotation Structural evolution Tectonic evolution Geochronology Landforms Structural geology Tectonics bending fold and thrust belt Nazca plate structural geology tectonic evolution Tertiary Andes Patagonia South America Tierra del Fuego [(ARC) South America] The kinematic evolution of the enigmatic arc-shaped southernmost Andes of Patagonia and Tierra del Fuego has been a subject of debate for most of the past century. We compared the results from analog sandbox experiments with the tectonic evolution and actual configuration of the mountain chain in order to elucidate whether oroclinal bending took place during the Tertiary, or if the southernmost Andes have been a curved orogen since at least Late Cretaceous time. Experiments simulating oroclinal rotation produced strong along-strike variations in shortening and failed to account for structural data compiled from the Fuegian Andes. Results from experiments simulating an L-shaped, concave-to-foreland indenter were in agreement with the known Tertiary structural evolution of the southernmost Andes. The diachronicity of principal shortening events previously recognized in Patagonia and Tierra del Fuego could only be reproduced by moving the indenter in two successive orthogonal directions: first approximately northward to form the Fuegian fold-and-thrust belt, and then approximately eastward to propagate thrusting in the Patagonian Andes. This two-phase evolution is consistent with a recorded change in the convergence direction of the Farallon-Nazca plate that occurred at ca. 27 Ma. © 2007 Geological Society of America. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00917613_v35_n1_p13_Ghiglione http://hdl.handle.net/20.500.12110/paper_00917613_v35_n1_p13_Ghiglione |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Arcurate structures Oroclines Patagonian Andes Sand analog experiments Tierra del Fuego Oroclinal rotation Structural evolution Tectonic evolution Geochronology Landforms Structural geology Tectonics bending fold and thrust belt Nazca plate structural geology tectonic evolution Tertiary Andes Patagonia South America Tierra del Fuego [(ARC) South America] |
| spellingShingle |
Arcurate structures Oroclines Patagonian Andes Sand analog experiments Tierra del Fuego Oroclinal rotation Structural evolution Tectonic evolution Geochronology Landforms Structural geology Tectonics bending fold and thrust belt Nazca plate structural geology tectonic evolution Tertiary Andes Patagonia South America Tierra del Fuego [(ARC) South America] Have the southernmost Andes been curved since Late Cretaceous time? An analog test for the Patagonian Orocline |
| topic_facet |
Arcurate structures Oroclines Patagonian Andes Sand analog experiments Tierra del Fuego Oroclinal rotation Structural evolution Tectonic evolution Geochronology Landforms Structural geology Tectonics bending fold and thrust belt Nazca plate structural geology tectonic evolution Tertiary Andes Patagonia South America Tierra del Fuego [(ARC) South America] |
| description |
The kinematic evolution of the enigmatic arc-shaped southernmost Andes of Patagonia and Tierra del Fuego has been a subject of debate for most of the past century. We compared the results from analog sandbox experiments with the tectonic evolution and actual configuration of the mountain chain in order to elucidate whether oroclinal bending took place during the Tertiary, or if the southernmost Andes have been a curved orogen since at least Late Cretaceous time. Experiments simulating oroclinal rotation produced strong along-strike variations in shortening and failed to account for structural data compiled from the Fuegian Andes. Results from experiments simulating an L-shaped, concave-to-foreland indenter were in agreement with the known Tertiary structural evolution of the southernmost Andes. The diachronicity of principal shortening events previously recognized in Patagonia and Tierra del Fuego could only be reproduced by moving the indenter in two successive orthogonal directions: first approximately northward to form the Fuegian fold-and-thrust belt, and then approximately eastward to propagate thrusting in the Patagonian Andes. This two-phase evolution is consistent with a recorded change in the convergence direction of the Farallon-Nazca plate that occurred at ca. 27 Ma. © 2007 Geological Society of America. |
| title |
Have the southernmost Andes been curved since Late Cretaceous time? An analog test for the Patagonian Orocline |
| title_short |
Have the southernmost Andes been curved since Late Cretaceous time? An analog test for the Patagonian Orocline |
| title_full |
Have the southernmost Andes been curved since Late Cretaceous time? An analog test for the Patagonian Orocline |
| title_fullStr |
Have the southernmost Andes been curved since Late Cretaceous time? An analog test for the Patagonian Orocline |
| title_full_unstemmed |
Have the southernmost Andes been curved since Late Cretaceous time? An analog test for the Patagonian Orocline |
| title_sort |
have the southernmost andes been curved since late cretaceous time? an analog test for the patagonian orocline |
| publishDate |
2007 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00917613_v35_n1_p13_Ghiglione http://hdl.handle.net/20.500.12110/paper_00917613_v35_n1_p13_Ghiglione |
| _version_ |
1768543837974691840 |