Extensional tectonics and gravitational collapse in an Ordovician passive margin: The Western Argentine Precordillera
The paper describes ubiquitous extensional structures developed in a passive margin of Ordovician age in the Argentine Precordillera. These extensional structures include normal faults and boudinaged sequences. In some places the boudinage reaches very high extension values, giving rise to block-in-...
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2008
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| LEADER | 16242caa a22010937a 4500 | ||
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| 001 | PAPER-6046 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518203543.0 | ||
| 008 | 190411s2008 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-38949085826 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Alonso, J.L. | |
| 245 | 1 | 0 | |a Extensional tectonics and gravitational collapse in an Ordovician passive margin: The Western Argentine Precordillera |
| 260 | |c 2008 | ||
| 270 | 1 | 0 | |m Alonso, J.L.; Department of Geology, University of Oviedo, c/ Arias de Velasco s/n, 33005 Oviedo, Spain; email: jlalonso@geol.uniovi.es |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a The paper describes ubiquitous extensional structures developed in a passive margin of Ordovician age in the Argentine Precordillera. These extensional structures include normal faults and boudinaged sequences. In some places the boudinage reaches very high extension values, giving rise to block-in-matrix formations. Most of these extensional structures developed when sediments were not well lithified, as recorded by hydroplastic fractures, slump folds and pinch-and-swell structures. The presence of slump folds coeval with the extensional deformation, the variable extension directions obtained from the kinematic analysis and a weak cleavage recording layer-perpendicular shortening support the interpretation that gravitational collapse related to submarine sliding was the cause for extensional deformation. Well-consolidated rocks, located at the lower part of the stratigraphic sequence, also display scarce extensional faults. These extensional faults predate folding because they were breached by flexural-slip faults and, as a result of their passive rotation in fold limbs, these initial normal faults may now appear as reverse faults, particularly in steep and overturned limbs. The truncation of extensional faults by flexural-slip faults produces typical bed thickness changes across the extensional faults, giving rise to apparent synsedimentary faults. These normal faults can be attributed to the crustal extension that generated the passive continental margin or may represent deep parts of faults related to gravitational collapse. © 2007 International Association for Gondwana Research. |l eng | |
| 536 | |a Detalles de la financiación: Ministry of Education and Science, CGL2006-12415-C03-02/BTE, CSD2006-0041, BTE02-04316-C0303 | ||
| 536 | |a Detalles de la financiación: We are grateful to reviewers Drs. L. A. Spalletti and N. H. Woodcock whose comments have improved the original manuscript. This work has been funded by DGICYT (Spanish Ministry of Education and Science) projects BTE02-04316-C0303, CGL2006-12415-C03-02/BTE and the Consolider-Ingenio 2010 Programme, under project CSD2006-0041, “Topo-Iberia”. | ||
| 593 | |a Department of Geology, University of Oviedo, c/ Arias de Velasco s/n, 33005 Oviedo, Spain | ||
| 593 | |a Instituto Geológico y Minero de España, c/ La Calera, 1, 28740 Tres Cantos, Madrid, Spain | ||
| 593 | |a Laboratorio de Tectónica Andina, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina | ||
| 690 | 1 | 0 | |a ARGENTINE PRECORDILLERA |
| 690 | 1 | 0 | |a EXTENSIONAL TECTONICS |
| 690 | 1 | 0 | |a GONDWANA |
| 690 | 1 | 0 | |a ORDOVICIAN |
| 690 | 1 | 0 | |a SUBMARINE SLIDING |
| 700 | 1 | |a Gallastegui, J. | |
| 700 | 1 | |a García-Sansegundo, J. | |
| 700 | 1 | |a Farias, P. | |
| 700 | 1 | |a Fernández, L.R.R. | |
| 700 | 1 | |a Ramos, V.A. | |
| 773 | 0 | |d 2008 |g v. 13 |h pp. 204-215 |k n. 2 |p Gondwana Res. |x 1342937X |t Gondwana Research | |
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