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Un depósito de sulfuro polimétrico tipo kuroko en una caldera submarina de silicio
1Geological Survey of Japan 1-3, Higashi-1, Tsukuba, Ibaraki 305-8567, Japan. Smithsonian Institution MRC-119, Washington, DC 20560-0119, USA. Japan Marine Science & Technology Center 2-15, Natsushima-cho, Yokosuka 237-0061, Japan. University of Tokyo.
Science (New York, N.Y.)
|February 12, 1999
Resumen
Se descubrió un gran depósito de sulfuro masivo volcanogénico tipo Kuroko, rico en oro y plata, en la caldera submarina Myojin Knoll. Este hallazgo sugiere que depósitos polimetales similares pueden existir en calderas silicicas submarinas inexploradas.
Área de la Ciencia:
- Geología marina Geología marina.
- Geología económica Geología económica.
- Volcanología Volcanología.
Sus antecedentes:
- Los depósitos del tipo Kuroko son importantes recursos polimetales.
- Las calderas submarinas son entornos poco explorados para depósitos masivos de sulfuro.
Objetivo del estudio:
- Para informar sobre el descubrimiento de un gran depósito de sulfuro masivo volcanogénico de tipo Kuroko.
- Evaluar el potencial de depósitos similares en otras calderas submarinas.
Principales métodos:
- Se llevaron a cabo encuestas sumergibles tripuladas.
- Se realizaron mapeos geológicos y muestreo del depósito de sulfuro.
Principales resultados:
- Se encontró un gran depósito de tipo Kuroko de crecimiento activo en el suelo de la caldera Myojin Knoll (1210-1360 m de profundidad).
- El depósito mide 400x400x30 metros y es rico en oro y plata.
- El depósito se encuentra dentro de una caldera submarina de arco frontal.
Conclusiones:
- El descubrimiento pone de relieve el potencial de depósitos significativos de sulfuro polimétrico en calderas submarinas de silicio.
- Se justifica una mayor exploración de entornos similares para identificar recursos adicionales.
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