Microestructuras asociadas a deformación frágil del relevo Ocaña-Curumaní. Sistema de Fallas de Bucaramanga
DOI:
https://doi.org/10.32685/0120-1425/boletingeo.42.2008.18Keywords:
Bucaramanga Fault System, fault rocks, cataclasites, brittle deformation
Downloads
How to Cite
Issue
Section
Published
Abstract
The Ocaña-Curumani relief of the Bucaramanga Fault System is distributed asymmetrically through different deformative phases: high degree (mylonites) near the main fault; shear cataclastic systems to the west. The deformation is defined by a cataclastic series of rocks with quartzfeldespathic protoliths associated with the Bucaramanga Gneiss (mapped in sheet 55 El Banco) with a mineralogical composition that includes orthoclase, microcline and plagioclase feldspars, quartz biotite epidote apatite sphene and opaque minerals. The cataclastic texture is demonstrated by the accumulation of combined intracrystalline deformation along with grain size reduction where the microstructures that display the minerals register the deformation to which the rock has been exposed. This suggests cataclastic flow in sites of tangential breakup by the generation and distribution of orthogonal adjustments of fractures, in addition to intragranular, transgranular and circumgranular microfractures, Riedel shears, extensional structures and microfaults.
References
Bard, J. P. (1985). Microtexturas de rocas ígneas y metamórficas. Masson S.A.
Barker, A. J. (1994). Introduction to metamorphic textures and microstructures. Oxford: Blackie Academic and Professional.
Blenkinsop, T. (2000). Deformation microstructures and mechanism in mineral and rocks. Norwel, USA: Klewer Academic Publishers.
Chester, F. M., Friedman, M. & Logan,J. M. (1985). Foliated cataclasites. Tectonophysics, 111, 139-146.
Clavijo, J. (1994). Mapa geológico de la Plancha 75, Aguachica. En proceso de publicación. Bucaramanga: INGEOMINAS.
Cuéllar, M. A. (2007). Análisis estructural del segmento sur de la traza de la Falla Santa Marta-Bucaramanga (FSMB), municipios de Pailitas y Curumaní-Departamento del Cesar. Tesis de Maestría. Bogotá: Universidad Nacional de Colombia.
Davis, G. H. & Reynolds1 S. J. (1996). Structural geology of rocks and regio ns. New York: Wiley & Sons.
Hibbard, M.J. (1995). Petrography to petrogenesis. New Jersey: Prentice Hall.
Higgins, M. W (1971). Cataclastic rocks. Geological Survey Professional Paper, 687.
INGEOMINAS-UIS. (2005). Compilación y levantamiento de la información cartográfica, geológica, geoquímica y geofísica de la Serranía de San Lucas. Acuerdo Específico 004, complementario al Convenio Marco de Cooperación 005 de 2005. Bogotá: INGEOMINAS.
INGEOMINAS-UIS. (2006). Mapa Geológico de la Plancha 55. El Banco. Bogotá: INGEOMINAS.
Julivert, M. (1968). Lexique stratigraphyque international Amerique Latine, Colombie (premiere partie). Paris: Centre National de la Recherche Scientifique.
Killick, A. M. (2003). Fault rock classification: An aid to structural interpretation in mine and exploration geology. South African Journal of Geology, 106, 395-402.
Knipe, R. J. (1989). Deformation mechanism recognition from natural tectonics. Journal of Structural Geology, 11(1-2), 81-92.
López, J. A., Cuéllar, M. A., Osorio, J. A., Bernal, L. E., & Cortés, E. (2008). Pseudotaquilitas y el carácter paleosísmico de un segmento del Sistema de Fallas de Bucaramanga (SFB), noreste del municipio de Pailitas, departamento del Cesar, Colombia. Boletín de Geología. Bucaramanga: Universidad Industrial de Santander.
Miller, J. B. (1960). Directrices tectónicas en la Sierra de Perijá y partes adyacentes de Venezuela y Colombia. Bol. Geol. Minist. Min. Hidroc., publ. esp. n.° 3. 3er Congr. Geol. Venezuela, Memoria. Tomo 2. Caracas, pp. 685-718.
Passchier, C. W & Trouw, R. A. J. (1996). Microtectonics. Berlín: Springer-Verlag.
Passchier, C. W. and Trouw, R. A.J. (2005). Microtectonics. 2nd edition. Berlín: Springer-Verlag.
Pryer, L. L. (1993). Microstructures in feldspars from a major crustal thrust zone: T he Grenville Front, Ontario, Canada. Journal of Structural Geology, 15, 21-36.
Pryer, L. L. & Robin, P. Y. F. (1995). Retrograde metamorphic reactions in deforming granites and the origin of the flame perthite. Journal of Metamorphic Geology, 14, 645-658.
Shelley, D. (1993). Igneous and metamorphic rocks under the microscope. Londres: Chapman and Hall.
Sibson, R. H. (1977). Fault rocks and fault mechanisms. Journal of the Geological Society of London, 1331 191-213.
Spry, A. (1969). Metamorphic textures. Oxford: Pergamon Press.
Swanson, M. T. (1992). Fault structure, wear mechanisms and rupture processes in pseudotachylyte generation. Tectonophysics, 204, 223-242.
Takagi, H, Goto, K. & Shigematsu, N. (2000). Ultramylonite bands derived from cataclasite and pseudotachylyte in granites1 northeast Japan. Journal of Structural Geology, 22, 1325-1339.
Tullis, R. J., Snoke, A. W & Todd, V. R. (1982). Penrose conference report. Significance and Petrogenesis of mylonitic rocks. Geology, 10(5 227-230.
Tullis, J. & Yund, R. A. (1985). Dynamic recrystallization of feldspar: a mechanism for ductile shear zone formation. Geology, 131 238-241.
Vernon, R. H. (2004). A practical guide to rock microstructure. Cambridge: Cambridge University Press.
Ward, D., Goldsmith, R., Cruz, J., Jaramillo, L. & Vargas, R. (1973). Geología de los cuadrángulos H-12 Bucaramanga y H-13 Pamplona, Departamento de Santander. Boletín Geológico, 21 (1-3 )1 1-32.
Winter, J. D. (2001). An introduction to igneous and metamorphic petrology. Londres: Prentice Hall.
Wise, D. V., Dunn, D. E, Engelder, J. T., Geiser, P. A., Hatcher, R. D., Kish, S. A. Odem, A. L. & Scharnel, S. (1984). Fault related rocks: suggestions for terminology. Geology, 12, 391-394.
