Folding, thrusting and development of push-up structures during the Miocene tectonic inversion of the Austral Basin, Southern Patagonian Andes (50°S)
Rift and post-rift sections of the Austral Basin in the Southern Patagonian fold and thrust belt were examined in outcrop and in 2D seismic reflection sections to evaluate geometric and kinematic aspects of the extension and subsequent inversion. The syn-rift section is composed of dacitic lava flow...
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todo:paper_00401951_v699_n_p102_Zerfass2023-10-03T14:50:23Z Folding, thrusting and development of push-up structures during the Miocene tectonic inversion of the Austral Basin, Southern Patagonian Andes (50°S) Zerfass, H. Ramos, V.A. Ghiglione, M.C. Naipauer, M. Belotti, H.J. Carmo, I.O. Austral Basin Patagonian Andes Push-up structures Tectonic inversion Binary alloys Geochronology Lead alloys Seismology Silicate minerals Uranium alloys Zircon Austral Basin Crystallization age Early Miocene Extensional faults Fold-and-thrust belts Marine shales Metamorphic basements Patagonian Andes Fault slips dacite fold and thrust belt inverse problem Miocene seismic reflection structural geology tectonic evolution Andes Austral Basin Patagonia Lama guanicoe Rift and post-rift sections of the Austral Basin in the Southern Patagonian fold and thrust belt were examined in outcrop and in 2D seismic reflection sections to evaluate geometric and kinematic aspects of the extension and subsequent inversion. The syn-rift section is composed of dacitic lava flows of the El Quemado Complex (Jurassic), the lowermost unit of the basin. The coastal sandstones of the Springhill Formation (Tithonian-Berriasian) and marine shales of the Río Mayer Formation (Berriasian-Albian) are thought to be sag units. However, field data suggest that these units are also part of the syn-rift successions, as evidenced by extensional growth strata in the lower levels of the Río Mayer Formation. A dacitic flow that is texturally and compositionally similar to those of the syn-rift phase and that is termed here the Río Guanaco dacite is interfingered with the basal strata of the Río Mayer Formation and has a U-Pb zircon crystallization age of c. 141 Ma (Berriasian). The outcropping section was inverted by compression in the early Miocene, according to structural and isotopic data of adjacent areas, producing a broad anticline with inverted and fossil extensional faults as well as newly generated thrusts. At the seismic scale, most of the extensional master faults present negligible reverse slip, and shortening was accommodated in hanging wall push-up structures. This situation is interpreted as a result of the competent metamorphic basement and volcanic syn-rift section, inducing frictional lock-up of the master faults. © 2017 Elsevier B.V. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00401951_v699_n_p102_Zerfass |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Austral Basin Patagonian Andes Push-up structures Tectonic inversion Binary alloys Geochronology Lead alloys Seismology Silicate minerals Uranium alloys Zircon Austral Basin Crystallization age Early Miocene Extensional faults Fold-and-thrust belts Marine shales Metamorphic basements Patagonian Andes Fault slips dacite fold and thrust belt inverse problem Miocene seismic reflection structural geology tectonic evolution Andes Austral Basin Patagonia Lama guanicoe |
| spellingShingle |
Austral Basin Patagonian Andes Push-up structures Tectonic inversion Binary alloys Geochronology Lead alloys Seismology Silicate minerals Uranium alloys Zircon Austral Basin Crystallization age Early Miocene Extensional faults Fold-and-thrust belts Marine shales Metamorphic basements Patagonian Andes Fault slips dacite fold and thrust belt inverse problem Miocene seismic reflection structural geology tectonic evolution Andes Austral Basin Patagonia Lama guanicoe Zerfass, H. Ramos, V.A. Ghiglione, M.C. Naipauer, M. Belotti, H.J. Carmo, I.O. Folding, thrusting and development of push-up structures during the Miocene tectonic inversion of the Austral Basin, Southern Patagonian Andes (50°S) |
| topic_facet |
Austral Basin Patagonian Andes Push-up structures Tectonic inversion Binary alloys Geochronology Lead alloys Seismology Silicate minerals Uranium alloys Zircon Austral Basin Crystallization age Early Miocene Extensional faults Fold-and-thrust belts Marine shales Metamorphic basements Patagonian Andes Fault slips dacite fold and thrust belt inverse problem Miocene seismic reflection structural geology tectonic evolution Andes Austral Basin Patagonia Lama guanicoe |
| description |
Rift and post-rift sections of the Austral Basin in the Southern Patagonian fold and thrust belt were examined in outcrop and in 2D seismic reflection sections to evaluate geometric and kinematic aspects of the extension and subsequent inversion. The syn-rift section is composed of dacitic lava flows of the El Quemado Complex (Jurassic), the lowermost unit of the basin. The coastal sandstones of the Springhill Formation (Tithonian-Berriasian) and marine shales of the Río Mayer Formation (Berriasian-Albian) are thought to be sag units. However, field data suggest that these units are also part of the syn-rift successions, as evidenced by extensional growth strata in the lower levels of the Río Mayer Formation. A dacitic flow that is texturally and compositionally similar to those of the syn-rift phase and that is termed here the Río Guanaco dacite is interfingered with the basal strata of the Río Mayer Formation and has a U-Pb zircon crystallization age of c. 141 Ma (Berriasian). The outcropping section was inverted by compression in the early Miocene, according to structural and isotopic data of adjacent areas, producing a broad anticline with inverted and fossil extensional faults as well as newly generated thrusts. At the seismic scale, most of the extensional master faults present negligible reverse slip, and shortening was accommodated in hanging wall push-up structures. This situation is interpreted as a result of the competent metamorphic basement and volcanic syn-rift section, inducing frictional lock-up of the master faults. © 2017 Elsevier B.V. |
| format |
JOUR |
| author |
Zerfass, H. Ramos, V.A. Ghiglione, M.C. Naipauer, M. Belotti, H.J. Carmo, I.O. |
| author_facet |
Zerfass, H. Ramos, V.A. Ghiglione, M.C. Naipauer, M. Belotti, H.J. Carmo, I.O. |
| author_sort |
Zerfass, H. |
| title |
Folding, thrusting and development of push-up structures during the Miocene tectonic inversion of the Austral Basin, Southern Patagonian Andes (50°S) |
| title_short |
Folding, thrusting and development of push-up structures during the Miocene tectonic inversion of the Austral Basin, Southern Patagonian Andes (50°S) |
| title_full |
Folding, thrusting and development of push-up structures during the Miocene tectonic inversion of the Austral Basin, Southern Patagonian Andes (50°S) |
| title_fullStr |
Folding, thrusting and development of push-up structures during the Miocene tectonic inversion of the Austral Basin, Southern Patagonian Andes (50°S) |
| title_full_unstemmed |
Folding, thrusting and development of push-up structures during the Miocene tectonic inversion of the Austral Basin, Southern Patagonian Andes (50°S) |
| title_sort |
folding, thrusting and development of push-up structures during the miocene tectonic inversion of the austral basin, southern patagonian andes (50°s) |
| url |
http://hdl.handle.net/20.500.12110/paper_00401951_v699_n_p102_Zerfass |
| work_keys_str_mv |
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