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La flexión oroclinal del batholito del sur de la Sierra Nevada
Science (New York, N.Y.)
|October 11, 1985
Resumen
El batolítico del sur de Sierra Nevada muestra en el sentido de las agujas del reloj desviaciones estructurales, magmáticas e isotópicas, lo que sugiere rotación tectónica. Esta curvatura oroclinal probablemente ocurrió antes de hace 16 millones de años debido a la cizalladura del límite de la placa.
Área de la Ciencia:
- La geofísica es la geofísica.
- Geología Estructural Geología estructural.
- La tectónica es la tectónica.
Sus antecedentes:
- El batolítico de Sierra Nevada exhibe complejas características estructurales, magmáticas y isotópicas.
- Estudios previos sugieren una potencial actividad tectónica en la región.
Objetivo del estudio:
- Para investigar las características estructurales y paleomagnéticas del batholito de Sierra Nevada.
- Para probar la hipótesis de la flexión oroclinal y la rotación tectónica en el sur de Sierra Nevada.
Principales métodos:
- Análisis de los datos estructurales, magmáticos e isotópicos del batholito de Sierra Nevada.
- Mediciones paleomagnéticas en tres localidades en el sur de Sierra Nevada.
- Cartografía geológica y análisis de fallas.
Principales resultados:
- Las características estructurales, magmáticas e isotópicas muestran una desviación en el sentido de las agujas del reloj en el sur de Sierra Nevada en comparación con las partes central y norte.
- Los datos paleomagnéticos indican una desviación progresiva de las direcciones de magnetización en el sur.
- No se observó ninguna deflexión paleomagnética significativa al noroeste del sistema de fallas White Wolf-Kern Canyon.
Conclusiones:
- Las deflexiones observadas son consistentes con la rotación tectónica y la flexión oroclinal del bloque sur de Sierra Nevada.
- La flexión oroclinal puede haber ocurrido antes de hace 16 millones de años.
- Esta deformación podría ser una respuesta al cizallamiento en el límite occidental de la placa norteamericana causado por la subducción oblicuo.
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