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Microplacas contra-rotativas en la triple unión de las Galápagos
Emily M Klein1, Deborah K Smith, Clare M Williams
1Nicholas School of the Environment and Earth Sciences, Duke University, Durham, North Carolina 27708-0227, USA. ek4@duke.edu
Nature
|February 25, 2005
Resumen
Una nueva grieta al este de la elevación del Pacífico Oriental revela dos microplacas contra-rotativas en la triple unión de las Galápagos. Este descubrimiento redefine nuestra comprensión del movimiento de las placas tectónicas en la región.
Área de la Ciencia:
- La geofísica es la geofísica.
- La tectónica de placas es la tectónica de placas.
- Geología marina Geología marina.
Sus antecedentes:
- La microplaca de Galápagos es una característica clave en el Pacífico ecuatorial oriental.
- Anteriormente se identificó un centro de propagación "incipiente" como su límite norte.
- Se pensó que este centro de propagación era una grieta que se propagaba lentamente hacia el oeste, divergiendo lentamente.
Objetivo del estudio:
- Investigar toda la extensión y el movimiento del centro de propagación "incipiente".
- Para entender las complejas interacciones tectónicas en la triple unión de las Galápagos.
- Para identificar y caracterizar microplacas adicionales en la región.
Principales métodos:
- Análisis de datos batimétricos para identificar las características de extensión del fondo marino.
- Modelado cinemático para determinar el movimiento de las microplacas en relación con las placas tectónicas principales.
- Interpretación geofísica de la propagación y rotación de las grietas.
Principales resultados:
- Pruebas presentadas para la ruptura hacia el este del centro de propagación "incipiente".
- Identificación de una segunda microplaca giratoria en sentido contrario a las agujas del reloj al norte de la microplaca de Galápagos.
- La triple unión de las Galápagos se caracteriza por dos microplacas contra-rotativas separadas por la grieta Hess Deep.
Conclusiones:
- La "fisura incipiente" se abre en sentido contrario a las agujas del reloj, limitando una segunda microplaca.
- La triple unión de las Galápagos involucra dos microplacas que giran en sentido contrario.
- El movimiento de las microplacas puede modelarse como bloques rígidos impulsados por el arrastre de los bordes.
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