Seismostratigraphic and structural setting of the Malvinas Basin and its southern margin (Tierra del fuego Atlantic offshore)
New multichannel seismic reflection profiles acquired off the Tierra del Fuego Atlantic margin, from the southern part of the Malvinas foreland basin to the inner sector of the Magallanes fold-and-thrust belt, combined with available commercial profiles and exploration wells, allowed to outline the...
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2008
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16956133_v6_n1_p55_Tassone http://hdl.handle.net/20.500.12110/paper_16956133_v6_n1_p55_Tassone |
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paper:paper_16956133_v6_n1_p55_Tassone2023-06-08T16:26:48Z Seismostratigraphic and structural setting of the Malvinas Basin and its southern margin (Tierra del fuego Atlantic offshore) Magallanes fold-and-thrust belt Malvinas basin Multichannel seismic data Seismostratigraphy Tectonic evolution Tierra del Fuego Atlantic margin Cenozoic deformation fold and thrust belt foreland basin Mesozoic seismic data seismic reflection seismic stratigraphy strike-slip fault tectonic evolution tectonostratigraphy Argentina Atlantic Ocean Austral Basin Malvinas Current Patagonia South America Tierra del Fuego [(PRV) Argentina] New multichannel seismic reflection profiles acquired off the Tierra del Fuego Atlantic margin, from the southern part of the Malvinas foreland basin to the inner sector of the Magallanes fold-and-thrust belt, combined with available commercial profiles and exploration wells, allowed to outline the sedimentary architecture of the foreland basin and the structure of its deformed southern margin. Five major unconformities were differentiated within the sedimentary fill of the southern Malvinas basin, which neighbours the offshore extension of the Magallanes basin in Tierra del Fuego. The unconformity-bounded units record the corresponding major evolutionary tectonostratigraphic phases of the southern part of the Malvinas basin, and the development of the Magallanes fold-and-thrust belt during Mesozoic and Cenozoic times: Unit 1 - Pre-Jurassic basement; Unit 2 - Rift phase (Middle - Upper Jurassic); Unit 3 - Sag phase (Lower - Upper Cretaceous); Unit 4 - Foredeep transitional phase (Upper Cretaceous - Middle Eocene); Unit 5 - Foreland phase (Middle Eocene - Pleistocene). The southern edge of the Malvinas basin corresponds to the imbricate basement wedges of the Fuegian Cordillera, which shows a thick-skin structural style developed as a consequence of the Middle Tertiary Andean compressional tectonic phase. Large folds, with low-angle NE-verging thrusts propagated the shortening basin-ward at shallow structural levels. These structures are superimposed by an array of left-lateral strike-slip lineaments pertaining to the EW-trending Magallanes-Fagnano fault system. In the Tierra del Fuego region these structures represent the western segment of the South America - Scotia plate boundary. Several Neogene pull-apart basins were formed along the principal deformation zone in correspondence of step-overs and releasing bends. These basins show an evident asymmetry in the sedimentary architecture, and are bounded by sub-vertical faults that in some cases reach the sea-floor. Other transtensional features were also recognized in the inner sector of the fold-and-thrust belt together with the formation of restricted pull-apart basins. © UB-ICTJA. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16956133_v6_n1_p55_Tassone http://hdl.handle.net/20.500.12110/paper_16956133_v6_n1_p55_Tassone |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Magallanes fold-and-thrust belt Malvinas basin Multichannel seismic data Seismostratigraphy Tectonic evolution Tierra del Fuego Atlantic margin Cenozoic deformation fold and thrust belt foreland basin Mesozoic seismic data seismic reflection seismic stratigraphy strike-slip fault tectonic evolution tectonostratigraphy Argentina Atlantic Ocean Austral Basin Malvinas Current Patagonia South America Tierra del Fuego [(PRV) Argentina] |
| spellingShingle |
Magallanes fold-and-thrust belt Malvinas basin Multichannel seismic data Seismostratigraphy Tectonic evolution Tierra del Fuego Atlantic margin Cenozoic deformation fold and thrust belt foreland basin Mesozoic seismic data seismic reflection seismic stratigraphy strike-slip fault tectonic evolution tectonostratigraphy Argentina Atlantic Ocean Austral Basin Malvinas Current Patagonia South America Tierra del Fuego [(PRV) Argentina] Seismostratigraphic and structural setting of the Malvinas Basin and its southern margin (Tierra del fuego Atlantic offshore) |
| topic_facet |
Magallanes fold-and-thrust belt Malvinas basin Multichannel seismic data Seismostratigraphy Tectonic evolution Tierra del Fuego Atlantic margin Cenozoic deformation fold and thrust belt foreland basin Mesozoic seismic data seismic reflection seismic stratigraphy strike-slip fault tectonic evolution tectonostratigraphy Argentina Atlantic Ocean Austral Basin Malvinas Current Patagonia South America Tierra del Fuego [(PRV) Argentina] |
| description |
New multichannel seismic reflection profiles acquired off the Tierra del Fuego Atlantic margin, from the southern part of the Malvinas foreland basin to the inner sector of the Magallanes fold-and-thrust belt, combined with available commercial profiles and exploration wells, allowed to outline the sedimentary architecture of the foreland basin and the structure of its deformed southern margin. Five major unconformities were differentiated within the sedimentary fill of the southern Malvinas basin, which neighbours the offshore extension of the Magallanes basin in Tierra del Fuego. The unconformity-bounded units record the corresponding major evolutionary tectonostratigraphic phases of the southern part of the Malvinas basin, and the development of the Magallanes fold-and-thrust belt during Mesozoic and Cenozoic times: Unit 1 - Pre-Jurassic basement; Unit 2 - Rift phase (Middle - Upper Jurassic); Unit 3 - Sag phase (Lower - Upper Cretaceous); Unit 4 - Foredeep transitional phase (Upper Cretaceous - Middle Eocene); Unit 5 - Foreland phase (Middle Eocene - Pleistocene). The southern edge of the Malvinas basin corresponds to the imbricate basement wedges of the Fuegian Cordillera, which shows a thick-skin structural style developed as a consequence of the Middle Tertiary Andean compressional tectonic phase. Large folds, with low-angle NE-verging thrusts propagated the shortening basin-ward at shallow structural levels. These structures are superimposed by an array of left-lateral strike-slip lineaments pertaining to the EW-trending Magallanes-Fagnano fault system. In the Tierra del Fuego region these structures represent the western segment of the South America - Scotia plate boundary. Several Neogene pull-apart basins were formed along the principal deformation zone in correspondence of step-overs and releasing bends. These basins show an evident asymmetry in the sedimentary architecture, and are bounded by sub-vertical faults that in some cases reach the sea-floor. Other transtensional features were also recognized in the inner sector of the fold-and-thrust belt together with the formation of restricted pull-apart basins. © UB-ICTJA. |
| title |
Seismostratigraphic and structural setting of the Malvinas Basin and its southern margin (Tierra del fuego Atlantic offshore) |
| title_short |
Seismostratigraphic and structural setting of the Malvinas Basin and its southern margin (Tierra del fuego Atlantic offshore) |
| title_full |
Seismostratigraphic and structural setting of the Malvinas Basin and its southern margin (Tierra del fuego Atlantic offshore) |
| title_fullStr |
Seismostratigraphic and structural setting of the Malvinas Basin and its southern margin (Tierra del fuego Atlantic offshore) |
| title_full_unstemmed |
Seismostratigraphic and structural setting of the Malvinas Basin and its southern margin (Tierra del fuego Atlantic offshore) |
| title_sort |
seismostratigraphic and structural setting of the malvinas basin and its southern margin (tierra del fuego atlantic offshore) |
| publishDate |
2008 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16956133_v6_n1_p55_Tassone http://hdl.handle.net/20.500.12110/paper_16956133_v6_n1_p55_Tassone |
| _version_ |
1768546321625513984 |