CARTOGRAFÍA NEOTECTÓNICA DE LA FALLA DE BOCONÓ ENTRE TABAY Y LA TOMA, MÉRIDA– VENEZUELA
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Universidad Industrial de Santander
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La Falla de Boconó es el principal accidente geológico del occidente Venezuela que se extiende por más de 500 km en dirección SO-NE. Esta falla posee una importante complejidad estructural en los andes venezolanos. En la zona entre las poblaciones de Tabay y La Toma, estado Mérida, se ha identificado que la falla se dispone de forma paralela y en algunos casos controla, al valle del río Chama. En tal sentido, este trabajó se basó en la búsqueda de rasgos geomorfológicos producidos por el movimiento de la falla los cuales se presentan de forma constante y consistente a lo largo de ella. Para ello, se realizó un análisis fotogeológico con las fotografías aéreas disponibles de la zona a escalas 1:25.000 (misión 010473), 1:40.000 (misión A34) y fotografías aéreas a escala 1:35.000 (misión 0503110), donde se pudieron describir la mayoría de los rasgos que luego fueron
corroborados directamente en el campo. En gran parte del tramo analizado, la falla se presenta como una traza única con marcadores geomorfológicos que evidencian movimientos rumbo deslizante dextrales con componente normal. Al sureste de la población de Tabay se observó la terminación de un segmento de falla que se extiende desde el suroeste, originando un gran lomo de presión. También se pudo corroborar la existencia de una cuenca en tracción en la zona de Mucuchíes, debido a que la falla experimenta un cambio de rumbo en sentido horario.
The Boconó fault is the most important and distinctive geological feature of western Venezuela. It runs for more than 500 km in the southeast-northwest direction with significant implication on the complex structure of the venezuelan Andes. Between the towns of Tabay and La Toma of Mérida state, it have been identified some segments of the fault parallel to the valley of Chama river. The overall geometry is rectilinear with the Chama basin located over the trace of the fault. This work attempts to describe the persistence and consistence of the geomorphological traits that have been produced by the most recent fault movements. Making use of the available aerial photography (scale: 1:25.000, 1:35.000 and 1:40.000) and field assessment, it was found that throughout much of the trace, the Boconó fault has a dextral strike-slip movement with a normal component. In particular, at southeast of Tabay town, it was observed that a fault segment, coming from the southwest, ends in a remarkable pressure ridge. It was also corroborated in Mucuchies town, a pull-apart basin due to the fact that the fault changes its pathway clockwise.
The Boconó fault is the most important and distinctive geological feature of western Venezuela. It runs for more than 500 km in the southeast-northwest direction with significant implication on the complex structure of the venezuelan Andes. Between the towns of Tabay and La Toma of Mérida state, it have been identified some segments of the fault parallel to the valley of Chama river. The overall geometry is rectilinear with the Chama basin located over the trace of the fault. This work attempts to describe the persistence and consistence of the geomorphological traits that have been produced by the most recent fault movements. Making use of the available aerial photography (scale: 1:25.000, 1:35.000 and 1:40.000) and field assessment, it was found that throughout much of the trace, the Boconó fault has a dextral strike-slip movement with a normal component. In particular, at southeast of Tabay town, it was observed that a fault segment, coming from the southwest, ends in a remarkable pressure ridge. It was also corroborated in Mucuchies town, a pull-apart basin due to the fact that the fault changes its pathway clockwise.
Keywords
active tectonics, Boconó Fault, Mérida, Andes de Venezuela, tectónica activa, Falla de Boconó, Mérida, Andes de Venezuela