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Correlación inconsistente entre el espesor de la capa sísmica 2a y el de la capa de lava en la corteza oceánica
Gail L Christeson1, Kirk D McIntosh, Jeffrey A Karson
1University of Texas Institute for Geophysics, Jackson School of Geosciences, J.J. Pickle Research Campus, Mail Code R2200, 10100 Burnet Road, Austin, Texas 78758, USA. gail@ig.utexas.edu
Nature
|January 26, 2007
Resumen
La capa sísmica 2A no traza con fiabilidad el límite entre lava y dique en la corteza oceánica joven. Este reflector sísmico probablemente representa un límite de alteración, no un contacto geológico distinto, que afecta a las interpretaciones de la estructura de la corteza.
Área de la Ciencia:
- La geofísica es la geofísica.
- Geología marina Geología marina.
- Sismología Sismología.
Sus antecedentes:
- La corteza oceánica comprende lavas que se superponen a un complejo de diques con capas en las cordilleras del océano medio.
- La "capa 2A" sísmica se interpreta comúnmente como el límite entre las lavas y los diques.
- Estudios previos habían inferido la geología de la corteza terrestre a partir de las variaciones de espesor de la capa 2A.
Objetivo del estudio:
- Para investigar la relación entre la capa sísmica 2A y la estructura geológica de la corteza oceánica joven.
- Para determinar si la capa 2A indica de manera confiable el límite entre lava y dique.
- Para reevaluar la interpretación de la capa sísmica 2A.
Principales métodos:
- Análisis de los datos de reflexión sísmica de la corteza de difusión rápida (profundidad de Hess) y de difusión intermedia (falta de transformación Blanco).
- Comparación de la estructura sísmica poco profunda con las secciones geológicas conocidas.
- Correlación de los reflectores sísmicos con las unidades geológicas.
Principales resultados:
- La capa 2A se encuentra cerca de la parte superior de los diques de hoja en la corteza que se extiende rápidamente.
- La capa 2A se encuentra significativamente por encima de los diques laminados en la corteza de extensión intermedia.
- La estructura sísmica superficial muestra similitudes a pesar de los diferentes espesores de la lava y la zona de transición.
Conclusiones:
- La capa sísmica 2A no es un marcador confiable para el límite entre lava y dique en la corteza oceánica joven.
- La capa 2A probablemente representa un límite de alteración dentro de la corteza.
- La ubicación de la capa 2A puede variar, ocurriendo dentro de lavas o cerca de la parte superior de los diques.
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