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End-Permian impactogenic earthquake and tsunami deposits in the intracratonic Paraná Basin of Brazil
2018; Geological Society of America; Volume: 130; Issue: 7-8 Linguagem: Inglês
10.1130/b31626.1
ISSN1943-2674
AutoresE. Tohver, M. Schmieder, Cris Lana, Pedro Simoes Teixeira Mendes, Fred Jourdan, Lucas V. Warren, Cláudio Riccomini,
Tópico(s)Geological formations and processes
ResumoResearch Article| January 02, 2018 End-Permian impactogenic earthquake and tsunami deposits in the intracratonic Paraná Basin of Brazil Eric Tohver; Eric Tohver † 1School of Earth Sciences, University of Western Australia, 35 Stirling Highway M004, Crawley, Western Australia 6009, Australia2Universidade de São Paulo, Insituto de Astronomia e Geofísica, Rua do Matão, 1226 - Cidade Universitária São Paulo, 05508-090, Brazil †eric.tohver@iag.usp.br Search for other works by this author on: GSW Google Scholar Martin Schmieder; Martin Schmieder 3Universities Space Research Association (USRA)–Lunar and Planetary Institute, 3600 Bay Area Boulevard, Houston, Texas, 77058 USA4National Aeronautics and Space Administration (NASA) Solar System Exploration Research Virtual Institute (SSERVI) Search for other works by this author on: GSW Google Scholar Cris Lana; Cris Lana 5Departamento de Geologia, Universidade Federal de Ouro Preto, Campus do Morro do Cruzeiro, Ouro Preto, MG 35400-000, Brazil Search for other works by this author on: GSW Google Scholar Pedro S.T. Mendes; Pedro S.T. Mendes 5Departamento de Geologia, Universidade Federal de Ouro Preto, Campus do Morro do Cruzeiro, Ouro Preto, MG 35400-000, Brazil Search for other works by this author on: GSW Google Scholar Fred Jourdan; Fred Jourdan 6Department of Applied Geology, Curtin University, Kent Street, Bentley, 6102 Western Australia, Australia Search for other works by this author on: GSW Google Scholar Lucas Warren; Lucas Warren 7Departamento de Geologia Aplicada, Universidade Estadual Paulista, Avenida 24-A, 1515 Bela Vista, Mailbox 178, Rio Claro, SP 13506-900, Brazil Search for other works by this author on: GSW Google Scholar Claudio Riccomini Claudio Riccomini 8Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562 Cidade Universitária, Sao Paulo, SP 05508-080, Brazil Search for other works by this author on: GSW Google Scholar Author and Article Information Eric Tohver † 1School of Earth Sciences, University of Western Australia, 35 Stirling Highway M004, Crawley, Western Australia 6009, Australia2Universidade de São Paulo, Insituto de Astronomia e Geofísica, Rua do Matão, 1226 - Cidade Universitária São Paulo, 05508-090, Brazil Martin Schmieder 3Universities Space Research Association (USRA)–Lunar and Planetary Institute, 3600 Bay Area Boulevard, Houston, Texas, 77058 USA4National Aeronautics and Space Administration (NASA) Solar System Exploration Research Virtual Institute (SSERVI) Cris Lana 5Departamento de Geologia, Universidade Federal de Ouro Preto, Campus do Morro do Cruzeiro, Ouro Preto, MG 35400-000, Brazil Pedro S.T. Mendes 5Departamento de Geologia, Universidade Federal de Ouro Preto, Campus do Morro do Cruzeiro, Ouro Preto, MG 35400-000, Brazil Fred Jourdan 6Department of Applied Geology, Curtin University, Kent Street, Bentley, 6102 Western Australia, Australia Lucas Warren 7Departamento de Geologia Aplicada, Universidade Estadual Paulista, Avenida 24-A, 1515 Bela Vista, Mailbox 178, Rio Claro, SP 13506-900, Brazil Claudio Riccomini 8Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562 Cidade Universitária, Sao Paulo, SP 05508-080, Brazil †eric.tohver@iag.usp.br Publisher: Geological Society of America Received: 31 Jul 2016 Revision Received: 29 Jun 2017 Accepted: 31 Oct 2017 First Online: 02 Jan 2018 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2018 Geological Society of America GSA Bulletin (2018) 130 (7-8): 1099–1120. https://doi.org/10.1130/B31626.1 Article history Received: 31 Jul 2016 Revision Received: 29 Jun 2017 Accepted: 31 Oct 2017 First Online: 02 Jan 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Eric Tohver, Martin Schmieder, Cris Lana, Pedro S.T. Mendes, Fred Jourdan, Lucas Warren, Claudio Riccomini; End-Permian impactogenic earthquake and tsunami deposits in the intracratonic Paraná Basin of Brazil. GSA Bulletin 2018;; 130 (7-8): 1099–1120. doi: https://doi.org/10.1130/B31626.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract We investigate the stratigraphic record of the Permian-Triassic intracratonic Paraná Basin of South America for evidence of the Araguainha impact event. Soft-sediment deformation features are widespread at distances 50–1000 km from the impact site in the Lopingian (latest Permian) strata of the uppermost Passa Dois Group. Evidence of seismicity includes recumbent folds and slumps, clastic dikes, thixotropic wedges, and autoclastic breccias that resulted from sediment liquefaction. The vertical compaction of clastic dikes indicates their formation prior to sediment lithification, and dike formation is generally confined to stratigraphic intervals with heterolithic beds of varying density and viscosity, i.e., interbedded sandstone and siltstone. These seismogenic features are generally closer to the impact site ( 2500 km) to the nearest active plate boundary. Seismites are limited in occurrence to the uppermost 100 m of the paleosurface at the time of impact, and the depth of seismite occurrence decreases with distance from the impact site. Above the seismite interval, the surface is extensively scoured and commonly overlain by a ≤4.5-m-thick debritic event bed. This sedimentary unit, the Porangaba bed, is a matrix-supported, unsorted conglomeratic breccia of variable thickness with an irregular, scoured base and tractional structures, including chaotically oriented to loosely imbricated clasts. Angular to subrounded clasts 10–400 cm in size are composed of altered chert, siltstone, and fine-grained sandstone that were derived from the underlying beds and are arrayed in a fining-upward pattern. In some localities, a second, clast-rich horizon is also observed with similar grading, but it has a smaller average clast size. This debrite bed has been identified in localities across the Paraná Basin at distances 50–1200 km from the impact site. The identification of zircon crystals with likely shock metamorphic planar microstructures in multiple samples obtained from this debritic layer links this stratigraphic horizon to the Araguainha impact event, and we interpret this bed as an ejecta-bearing tsunami deposit. The youngest population (n = 12) of unshocked, idiomorphic detrital zircon crystals provides a maximum depositional age of 253.0 ± 3.0 Ma for this event horizon, contemporaneous, within analytical error, with current geochronologic constraints on the impact event. These findings demonstrate that a catastrophic event around the Permian-Triassic boundary in Brazil created one of the world's most extensive seismite-tsunamite couplets. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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