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30.000 años de actividad hidrotermal en el campo de ventilación de la ciudad perdida
Gretchen L Früh-Green1, Deborah S Kelley, Stefano M Bernasconi
1Department of Earth Sciences, Eidgenössische Technische Hochschule, Zürich (ETH-Z), CH-8092 Zurich, Switzerland. gretli@erdw.ethz.ch
Science (New York, N.Y.)
|July 26, 2003
Resumen
La actividad hidrotermal en la Ciudad Perdida ha estado en curso durante más de 30.000 años, impulsada por la serpentización. Este proceso geológico, alimentado por el agua de mar que interactúa con la peridotita, puede sostener tales sistemas durante potencialmente millones de años.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Geología Geología Geología.
- Oceanografía La oceanografía es la oceanografía.
Sus antecedentes:
- El campo hidrotermal de Ciudad Perdida es un sistema fuera del eje.
- La serpentinización es un proceso geológico clave que implica la reacción del agua de mar con la peridotita.
Objetivo del estudio:
- Para documentar la duración y la velocidad de la actividad hidrotermal en la Ciudad Perdida.
- Comprender los mecanismos que sostienen los sistemas hidrotermales a largo plazo.
Principales métodos:
- Análisis de isótopos de estroncio, carbono y oxígeno.
- Técnicas de datación por radiocarbono.
Principales resultados:
- Hay evidencia de al menos 30.000 años de actividad hidrotermal.
- Se estima que la tasa de serpentinización es de 1,2 x 10(-4) kilómetros cúbicos por año.
- Se identificaron factores cruciales: el acceso del agua de mar a la peridotita, las fallas, la expansión y la pérdida de masa.
Conclusiones:
- La serpentinización es un impulsor a largo plazo de la actividad hidrotermal en la Ciudad Perdida.
- Estos sistemas pueden persistir durante cientos de miles a millones de años.
- Los hallazgos son relevantes para la comprensión de sistemas similares en entornos de expansión lenta y ultra lenta.
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