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Antiguas islas de hielo en lagos salados de los Andes centrales
Science (New York, N.Y.)
|April 20, 1984
Resumen
Las enormes islas de hielo en los lagos andinos se están derritiendo debido al aumento del calor geotérmico y el agua salada. Estas formaciones geológicas únicas pueden haberse originado de la congelación de agua dulce durante la "Pequeña Edad de Hielo".
Área de la Ciencia:
- Geología Geología Geología.
- Glaciología glaciología.
- Limología Limología.
Sus antecedentes:
- Los lagos poco profundos y salinos de los Andes albergan enormes islas de hielo de agua dulce y sedimentos congelados.
- Estas islas de hielo exhiben dimensiones significativas, que se extienden por encima y por debajo de la superficie del agua.
Objetivo del estudio:
- Investigar la formación y el rápido derretimiento de islas de hielo únicas en lagos salinos andinos.
- Comprender los procesos geológicos y térmicos que influyen en estas formaciones.
Principales métodos:
- Observaciones de campo de las dimensiones de las islas de hielo y la composición de los sedimentos.
- Análisis de posibles mecanismos de formación relacionados con eventos climáticos pasados.
- Evaluación de los factores térmicos e hidrológicos actuales que contribuyen a la fusión.
Principales resultados:
- Las islas de hielo, compuestas de hielo de agua dulce y sedimentos (aragonita/calcita), sobresalen de los lagos salinos.
- Se supone que la formación se debe a la congelación del agua de los poros de agua dulce durante la Pequeña Edad de Hielo.
- Se observa un rápido derretimiento, relacionado con el aumento del flujo de calor geotérmico y la subducción de la salina.
Conclusiones:
- Las islas de hielo andinas son características geológicas notables con orígenes potenciales en condiciones climáticas pasadas.
- Los cambios geotérmicos e hidrológicos actuales están impulsando la rápida degradación de estas formaciones de hielo.
- Se necesita más investigación para comprender plenamente la dinámica de estos entornos glaciar-lacustrinos únicos.
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