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Un posible campo sembrado de tektita en la Pampa argentina
P A Bland1, C R de Souza Filho, A J T Jull
1Planetary and Space Sciences Research Institute, The Open University, Milton Keynes MK7 6AA, UK. p.a.bland@open.ac.uk
Science (New York, N.Y.)
|May 11, 2002
Resumen
Los investigadores investigaron fragmentos de vidrio en Argentina, que inicialmente se pensó que eran eyecciones de impacto. Nuevos hallazgos sugieren que el vidrio es tektita, posiblemente de un evento de impacto de hace 0,48 millones de años, creando un nuevo campo sembrado.
Área de la Ciencia:
- Geología Geología Geología.
- La geofísica es la geofísica.
- Ciencias planetarias Ciencias planetarias.
Sus antecedentes:
- Las depresiones alargadas en la llanura pampeana de Argentina fueron interpretadas previamente como evidencia de un evento de impacto.
- El vidrio de impacto asociado sugirió eyecciones proximales de un impacto altamente oblicuo.
Objetivo del estudio:
- Reevaluar el origen de las características alargadas y el vidrio asociado en la llanura pampeana.
- Para determinar si los fragmentos de vidrio representan eyecciones de impacto o tektitas.
Principales métodos:
- Cartografía geológica para identificar y caracterizar rasgos alargados.
- Datación geocronológica de fragmentos de vidrio.
- Comparación de la edad de vidrio y la composición con los conocidos campos de tektita.
Principales resultados:
- Se identificaron aproximadamente 400 rasgos alargados adicionales, que exhiben características de origen eólico (soplado por el viento), no de impacto.
- La datación de fragmentos de vidrio de las depresiones de Río Cuarto arrojó una edad consistente con el vidrio encontrado a 800 km de distancia.
- El vidrio es probablemente material de tektita, lo que sugiere un evento de impacto significativo hace aproximadamente 0,48 millones de años.
Conclusiones:
- Las depresiones alargadas son principalmente de origen eólico.
- Los fragmentos de vidrio representan tektitas, no eyecciones proximales de un impacto local.
- Los hallazgos indican el descubrimiento de un nuevo campo sembrado de tektita en el hemisferio sur, vinculado a un evento de impacto de ~ 0.48 Ma.
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