Geometric reconstruction and trishear model of folding:: a case study in the western Principal Cordillera, Central Chile .

Pascual Jara Martínez; Reynaldo Charrier; M. Farías; César Arriagada

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Geometric reconstruction and trishear model of folding:: a case study in the western Principal Cordillera, Central Chile .

Autores: Pascual Jara Martínez , Reynaldo Charrier, M. Farías, César Arriagada
Localización: Trabajos de geología, ISSN 0474-9588, Nº 29, 2009, págs. 375-380
Idioma: inglés
Enlaces
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Resumen
- The western Principal Cordillera consists of thick volcanic successions accumulated in an extensional basin and deformed in Early Neogene times during tectonic inversion of the basin. In the study region, key-layers are lacking and, for this reason, geometrical reconstructions are difficult. The main structure is a N-S-oriented syncline bounded by faults. Reconstructions using the fault-propagation fold and trishear models indicate that this structure is controlled by faults, a western (WF, cut-off angle ~40-60º) and an eastern fault (EF, cut-off angle ~20º). WF, the most important one, is interpreted as an inverted normal fault associated with basin inversion, whereas EF is interpreted as a short-cut related to WF. Shortening is 2-3 km (~30%).
Referencias bibliográficas
- ALLMENDINGER, R. W. (1997-2003): FaultFold 4.5.4 (formerly TRISHEAR, Windows version).
- CHARRIER, R., BAEZA, O., ELGUETA, S., FLYNN, J. J., GANS, P., KAY, S. M., MUÑOZ, N., WYSS, A. R. and ZURITA, E. (2002): Evidence for Cenozoic...
- CHARRIER, R., BUSTAMANTE, M., COMTE, D., ELGUETA, S., FLYNN, J. J., ITURRA, N., MUÑOZ, N., PARDO, M., THIELE, R. and WYSS, A. R. (2005): The...
- ERSLEV, E. (1991): Trishear fault-propagation folding. Geology, 19: 617-620.
- FARÍAS, M. (2007): Tectónica y erosión en la evolución del relieve de los Andes de Chile central durante el Neógeno. PhD Thesis, Universities...
- FARÍAS, M., CHARRIER, R., CARRETIER, S., MARTINOD, J., FOCK, A., CAMPBELL, D., CÁCERES, J. and COMTE, D. (2008): Late Miocene high and rapid...
- FOCK, A., CHARRIER, R., FARÍAS, M. and MUÑOZ, M. (2006): Fallas de vergencia oeste en la Cordillera Principal de Chile Central (33º S-34º...
- HARDY, S. and FORD, M. (1997): Numerical modeling of trishear fault propagation folding. Tectonics, 16, 5: 841-854.
- SUPPE, J. and MEDWEDEFF, D. (1990): Geometry and kinematics of fault-propagation folding. Eclogae Geol. Helv., 83, 3: 409-454.
- ZEHNDER, A .T. and ALLMENDINGER, R. W. (2000): Velocity field for the trishear model. J. Struct. Geol., 22: 1009-1014.