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Using Archival Japanese Paper and Thermoplastic Resins to Prepare Fossils for Storage, Display, Transport, and Radiography

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Eventos medioambientales del Cretácico terminal.

C B Officer, C L Drake

Science (New York, N.Y.)

|March 8, 1985

Resumen

El registro geológico muestra que el iridio se depositó durante miles de años, no instantáneamente. La evidencia sugiere que la actividad volcánica, no un impacto de asteroides, causó estos eventos ambientales finales del Cretácico.

Área de la Ciencia:

La geoquímica es la geoquímica.
Paleontología Paleontología.
Volcanología Volcanología.

Sus antecedentes:

El período final del Cretácico está marcado por cambios ambientales significativos.
El origen del iridio y los elementos asociados que se encuentran en el registro geológico ha sido objeto de debate.
Distinguir entre los eventos de impacto y la actividad volcánica es crucial para comprender las extinciones pasadas.

Objetivo del estudio:

Para analizar el marco de tiempo de deposición del iridio y los elementos asociados.
Para determinar el origen de estos elementos (mantle vs. meteorítico).
Para evaluar la probabilidad de un impacto de asteroides frente a los eventos volcánicos como la causa de los cambios ambientales del Cretácico terminal.

Principales métodos:

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Análisis del registro geológico análisis de registros geológicos.

El análisis de deposiciones elementales.

Datación cronológica de los estratos geológicos.

Principales resultados:

El iridio y los elementos asociados se depositaron durante un período de 10.000 a 100.000 años.
La evidencia geológica apoya un origen del manto para estos elementos.
Los hallazgos se alinean con un escenario de intensa actividad volcánica, no con un solo impacto de asteroides.

Conclusiones:

La deposición de iridio y elementos asociados no fue instantánea.
La actividad volcánica es favorecida como la fuente de estos elementos.
Una serie de eventos volcánicos, en lugar de un impacto de asteroides, probablemente causaron los cambios ambientales finales del Cretácico.