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El efecto de la actividad magmática en la ventilación hidrotermal a lo largo de la súper rápida expansión del aumento
Science (New York, N.Y.)
|August 25, 1995
Resumen
Las columnas hidrotermales son abundantes a lo largo de la elevación del Pacífico Este, lo que indica una actividad magmática frecuente. Esta cresta de propagación súper rápida muestra el doble de cobertura de penacho en comparación con otras secciones.
Área de la Ciencia:
- Geología Geología Geología.
- Oceanografía La oceanografía es la oceanografía.
- La geoquímica es la geoquímica.
Sus antecedentes:
- La actividad hidrotermal es un proceso clave en los sistemas de cordillera del océano medio.
- Las crestas de propagación súper rápida como el East Pacific Rise exhiben características geológicas únicas.
- Comprender la distribución y composición de las plumas proporciona información sobre los procesos magmáticos e hidrotermales.
Objetivo del estudio:
- Para estudiar la distribución del penacho hidrotermal a lo largo de la elevación del Pacífico Este.
- Investigar la relación entre las características del penacho y las características geológicas subyacentes.
- Para evaluar la frecuencia de las influencias magmáticas en la circulación hidrotermal.
Principales métodos:
- Realización de un estudio de la actividad hidrotermal a lo largo de la elevación del Pacífico Este.
- Mapeando la extensión de las columnas hidrotermales a lo largo de la cresta de la cresta.
- Analizar la composición química de las columnas, centrándose en las especies volátiles y no volátiles.
Principales resultados:
- Las columnas hidrotermales cubren aproximadamente el 60% de la cresta de la cresta estudiada (13°50'18°40'S).
- La abundancia de plumas es significativamente mayor (casi el doble) que en secciones de cresta de extensión lenta comparables.
- Las plumas eran más frecuentes sobre secciones transversales axiales infladas con cámaras de magma axial.
- Las altas proporciones de especies volátiles y no volátiles en las columnas indican perturbaciones magmáticas recientes.
Conclusiones:
- El East Pacific Rise exhibe una cobertura de penachos hidrotermales excepcionalmente alta.
- La presencia de cámaras de magma axial se correlaciona con el aumento de la abundancia de penachos.
- La actividad magmática frecuente influye significativamente en la circulación hidrotermal en esta cresta de extensión súper rápida.
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