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El flujo de calor y la circulación hidrotermal en la cordillera de cascada, en el centro-norte de Oregon
Science (New York, N.Y.)
|March 17, 1989
Resumen
El flujo de agua subterránea, no el magma profundo, probablemente causa el alto flujo de calor en Oregon.
Área de la Ciencia:
- La geofísica es la geofísica.
- Volcanología Volcanología.
- Hidrología Hidrología Hidrología.
Sus antecedentes:
- La cordillera de las Cascadas del centro-norte de Oregón exhibe un flujo de calor cercano a la superficie cercano a cero en rocas volcánicas jóvenes.
- Estudios previos sugirieron una fuente de calor magmática profunda para el alto flujo de calor en las rocas más antiguas.
Objetivo del estudio:
- Para investigar la causa del flujo de calor anormalmente alto en las rocas más antiguas a menor altitud.
- Diferenciar entre las fuentes de calor magmáticas y la circulación de las aguas subterráneas como el principal impulsor del flujo de calor.
Principales métodos:
- Mediciones de flujo de calor adjetivo.
- Análisis del presupuesto de calor.
- Evaluación geológica de las edades y formaciones rocosas volcánicas.
Principales resultados:
- La circulación de las aguas subterráneas elimina efectivamente el calor de las áreas con rocas volcánicas jóvenes (menos de 6 millones de años).
- Este calor eliminado explica la alta descarga térmica advectiva y conductiva observada en las formaciones rocosas más antiguas.
- La anomalía de calor en las rocas más antiguas es probablemente un fenómeno de poca profundidad impulsado por el flujo regional de agua subterránea.
Conclusiones:
- El flujo regional de aguas subterráneas es una explicación más plausible para el alto flujo de calor observado que una fuente magmática profunda de la corteza intermedia.
- Cualquier fuente de calor magmática más profunda es probablemente estrecha, variable y confinada al arco Cuaternario (menos de 2 millones de años de antigüedad).
- Se recomienda una perforación profunda adicional para validar los modelos de flujo de calor.
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