Earthquake-induced soft-sediment deformation structures in Upper Jurassic open-marine microbialites (Neuquén Basin, Argentina)
Penecontemporaneous decimetre-scale soft-sediment deformation structures are reported from the basal part of the Upper Jurassic-Lower Cretaceous Vaca Muerta Formation, in the Malargüe-Las Leñas area of the back-arc Neuquén Basin (Mendoza Province, Central Andes). The deformed interval (Amarillas bed...
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todo:paper_00370738_v235_n3-4_p210_MartinChivelet2023-10-03T14:48:01Z Earthquake-induced soft-sediment deformation structures in Upper Jurassic open-marine microbialites (Neuquén Basin, Argentina) Martín-Chivelet, J. Palma, R.M. López-Gómez, J. Kietzmann, D.A. Andes Back-arc basin Carbonate rocks Seismites Soft-sediment deformation Tithonian Deformation Earthquakes Geographical distribution Sediments Andes Back-arc basin Carbonate rock Seismites Soft-sediment deformation Tithonian Geodynamics backarc basin biostratigraphy boudinage brittle deformation continental margin deformation mechanism depositional environment ductile deformation earthquake mechanism Jurassic-Cretaceous boundary microbialite paleoenvironment plastic deformation seismite Tithonian Argentina Neuquen Basin Ammonoidea Penecontemporaneous decimetre-scale soft-sediment deformation structures are reported from the basal part of the Upper Jurassic-Lower Cretaceous Vaca Muerta Formation, in the Malargüe-Las Leñas area of the back-arc Neuquén Basin (Mendoza Province, Central Andes). The deformed interval (Amarillas bed) is only 0.3 to 0.9m thick but occurs in a wide area, larger than 1500km 2 . Its age, determined by ammonite biostratigraphy, is Early Tithonian.The soft-sediment deformation structures were generated in finely laminated, partially consolidated, organic-rich, carbonate microbialites that were deposited in open-marine, poorly oxygenated settings, apparently devoid of any significant slope. Those structures include boudins of different sizes and complexity, a variety of folds, normal (listric) dm-scale faults, sub-horizontal detachment surfaces and other features, which are part of several larger-scale, complex slump structures. Deformation was dominantly plastic but near to the ductile-brittle field transition.On the basis of the observed soft-deformation structures, their geographic distribution, their lateral homogeneity, and the geodynamic framework of the basin in which it was generated, the Amarillas bed can be tentatively attributed to a large, intermediate-depth earthquake that occurred within the plate that subducted beneath the Andean continental margin and the Neuquén back-arc basin. © 2010 Elsevier B.V. Fil:Palma, R.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Kietzmann, D.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00370738_v235_n3-4_p210_MartinChivelet |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Andes Back-arc basin Carbonate rocks Seismites Soft-sediment deformation Tithonian Deformation Earthquakes Geographical distribution Sediments Andes Back-arc basin Carbonate rock Seismites Soft-sediment deformation Tithonian Geodynamics backarc basin biostratigraphy boudinage brittle deformation continental margin deformation mechanism depositional environment ductile deformation earthquake mechanism Jurassic-Cretaceous boundary microbialite paleoenvironment plastic deformation seismite Tithonian Argentina Neuquen Basin Ammonoidea |
| spellingShingle |
Andes Back-arc basin Carbonate rocks Seismites Soft-sediment deformation Tithonian Deformation Earthquakes Geographical distribution Sediments Andes Back-arc basin Carbonate rock Seismites Soft-sediment deformation Tithonian Geodynamics backarc basin biostratigraphy boudinage brittle deformation continental margin deformation mechanism depositional environment ductile deformation earthquake mechanism Jurassic-Cretaceous boundary microbialite paleoenvironment plastic deformation seismite Tithonian Argentina Neuquen Basin Ammonoidea Martín-Chivelet, J. Palma, R.M. López-Gómez, J. Kietzmann, D.A. Earthquake-induced soft-sediment deformation structures in Upper Jurassic open-marine microbialites (Neuquén Basin, Argentina) |
| topic_facet |
Andes Back-arc basin Carbonate rocks Seismites Soft-sediment deformation Tithonian Deformation Earthquakes Geographical distribution Sediments Andes Back-arc basin Carbonate rock Seismites Soft-sediment deformation Tithonian Geodynamics backarc basin biostratigraphy boudinage brittle deformation continental margin deformation mechanism depositional environment ductile deformation earthquake mechanism Jurassic-Cretaceous boundary microbialite paleoenvironment plastic deformation seismite Tithonian Argentina Neuquen Basin Ammonoidea |
| description |
Penecontemporaneous decimetre-scale soft-sediment deformation structures are reported from the basal part of the Upper Jurassic-Lower Cretaceous Vaca Muerta Formation, in the Malargüe-Las Leñas area of the back-arc Neuquén Basin (Mendoza Province, Central Andes). The deformed interval (Amarillas bed) is only 0.3 to 0.9m thick but occurs in a wide area, larger than 1500km 2 . Its age, determined by ammonite biostratigraphy, is Early Tithonian.The soft-sediment deformation structures were generated in finely laminated, partially consolidated, organic-rich, carbonate microbialites that were deposited in open-marine, poorly oxygenated settings, apparently devoid of any significant slope. Those structures include boudins of different sizes and complexity, a variety of folds, normal (listric) dm-scale faults, sub-horizontal detachment surfaces and other features, which are part of several larger-scale, complex slump structures. Deformation was dominantly plastic but near to the ductile-brittle field transition.On the basis of the observed soft-deformation structures, their geographic distribution, their lateral homogeneity, and the geodynamic framework of the basin in which it was generated, the Amarillas bed can be tentatively attributed to a large, intermediate-depth earthquake that occurred within the plate that subducted beneath the Andean continental margin and the Neuquén back-arc basin. © 2010 Elsevier B.V. |
| format |
JOUR |
| author |
Martín-Chivelet, J. Palma, R.M. López-Gómez, J. Kietzmann, D.A. |
| author_facet |
Martín-Chivelet, J. Palma, R.M. López-Gómez, J. Kietzmann, D.A. |
| author_sort |
Martín-Chivelet, J. |
| title |
Earthquake-induced soft-sediment deformation structures in Upper Jurassic open-marine microbialites (Neuquén Basin, Argentina) |
| title_short |
Earthquake-induced soft-sediment deformation structures in Upper Jurassic open-marine microbialites (Neuquén Basin, Argentina) |
| title_full |
Earthquake-induced soft-sediment deformation structures in Upper Jurassic open-marine microbialites (Neuquén Basin, Argentina) |
| title_fullStr |
Earthquake-induced soft-sediment deformation structures in Upper Jurassic open-marine microbialites (Neuquén Basin, Argentina) |
| title_full_unstemmed |
Earthquake-induced soft-sediment deformation structures in Upper Jurassic open-marine microbialites (Neuquén Basin, Argentina) |
| title_sort |
earthquake-induced soft-sediment deformation structures in upper jurassic open-marine microbialites (neuquén basin, argentina) |
| url |
http://hdl.handle.net/20.500.12110/paper_00370738_v235_n3-4_p210_MartinChivelet |
| work_keys_str_mv |
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