Shallow crustal structure of the junction of the grabens of Chapala, Tepic-Zacoalco and Colima, Mexico
Gravity data is used to infer the shallow crustal structure of the Tepic graben adjacent to the City of Guadalajara. Thisdepression does not constitute a symmetric graben with steep master faults but rather a complex transition zone. Blocks detachedfrom the granitic sierras are downfaulted and tilte...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 1998 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:56837402 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=56837402 |
| Access Level: | acceso abierto |
| Palabra clave: | Ciencias de la Tierra limit Tepic graben Jalisco Block triple junction area Sierra Madre Occidental |
| Sumario: | Gravity data is used to infer the shallow crustal structure of the Tepic graben adjacent to the City of Guadalajara. Thisdepression does not constitute a symmetric graben with steep master faults but rather a complex transition zone. Blocks detachedfrom the granitic sierras are downfaulted and tilted to the northeast along the front of these sierras. Farther to the north, the graniticbasement deepens gradually. However, it steepens at the limit between the Sierra Madre Occidental and the Jalisco Block. Northwestof our study area, the limit is located north of the Plan de Barrancas fault. At the east the limit is located closer to thesouthward prolongation of the Plan de Barrancas fault. The change in position occurs near La Primavera caldera. The La Primaveracaldera, Tequila volcano, and vents of cinder and lava cones are emplaced along NW-SE weakness zones in the batholith. Thecrust of the Sierra Madre Occidental adjacent to the limit features NE-SW lineaments perpendicular to those of the neighbouringJalisco Block (JB). |
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