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Marco geológico de los sitios no marinos del límite cretácico-terciario, la cuenca del ratón, Nuevo México y Colorado
Science (New York, N.Y.)
|March 16, 1984
Resumen
Se encontraron altas concentraciones de iridio en el límite entre el Cretácico y el Terciario en la Cuenca de Ratón. Este descubrimiento está vinculado a una capa específica de piedra arcillosa dentro de la Formación Ratón, lo que indica un evento geológico significativo.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Paleontología Paleontología.
- Geología sedimentaria Geología sedimentaria
Sus antecedentes:
- El límite Cretácico-Terciario (K-T) marca un evento de extinción significativo en la historia de la Tierra.
- Las anomalías de iridio a menudo se asocian con impactos extraterrestres, como el evento de impacto de Chicxulub.
- Las rocas sedimentarias fluviales proporcionan una visión única de los paleoambientes terrestres.
Objetivo del estudio:
- Para investigar las concentraciones anómalas de iridio en el límite palinológico Cretácico-Terciario.
- Para caracterizar el contexto geológico de la anomalía de iridio en la cuenca de Raton.
- Para correlacionar los hallazgos con posibles marcadores de eventos extraterrestres.
Principales métodos:
- Análisis geoquímico de muestras de rocas sedimentarias para determinar las concentraciones de iridio.
- Análisis palinológico para identificar con precisión el límite Cretácico-Terciario.
- El registro estratigráfico y la descripción de las rocas sedimentarias fluviales en la Formación Ratón.
Principales resultados:
- Se detectaron concentraciones anormalmente altas de iridio en el límite entre el Cretácico y el Terciario.
- La anomalía del iridio está asociada espacialmente con un fino lecho de piedra caliza kaolinítica.
- Esta piedra arcillosa se encuentra dentro de una secuencia discontinua de esquisto carbonáceo y carbón en la Formación Ratón inferior.
Conclusiones:
- La anomalía de iridio detectada en la cuenca de Raton apoya la hipótesis de un evento extraterrestre que influye en los ecosistemas terrestres.
- La asociación con litologías específicas (argile kaolinítica, esquisto carbonáceo, carbón) proporciona pistas sobre el entorno de deposición.
- Se necesita más investigación para comprender plenamente las implicaciones de esta anomalía para los eventos del límite K-T en América del Norte.
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