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El máximo térmico del Paleoceno-Eoceno y la apertura del Atlántico Noreste
Michael Storey1, Robert A Duncan, Carl C Swisher
1Quaternary Dating Laboratory, Department of Environment, Society and Spatial Change, Roskilde University Centre, Post Office Box 260, 4000 Roskilde, Denmark.
Science (New York, N.Y.)
|April 28, 2007
Resumen
El Máximo Térmico Paleoceno-Eoceno (PETM) fue provocado por la liberación de gases de efecto invernadero durante el vulcanismo cerca del límite de la placa Groenlandia-Europa. Este evento ocurrió después de que erupciones masivas de inundación de basalto comenzaron hace aproximadamente 56.1 millones de años.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Geocronología Geocronología.
- La tectónica de placas es la tectónica de placas.
Sus antecedentes:
- El Máximo Térmico Paleoceno-Eoceno (PETM) es un evento significativo de calentamiento global.
- Las hipótesis anteriores atribuían el PETM a la repentina liberación de dióxido de carbono y/o metano.
Objetivo del estudio:
- Datar con precisión los eventos geológicos clave que rodean al PETM.
- Para correlacionar la actividad volcánica con el inicio del PETM.
- Investigar los mecanismos de activación del PETM.
Principales métodos:
- Utilizó determinaciones de edad de 40Ar/39Ar.
- Fechado el depósito danés Ash-17 y la Formación Skraenterne Tuff.
- Correlacionó estos depósitos con el PETM y los eventos de ruptura continental.
Principales resultados:
- El depósito danés Ash-17 y la Formación Skraenterne Tuff son contemporáneos.
- La aparición del PETM es posterior al comienzo del masivo vulcanismo basáltico de inundación (56,1 +/- 0,4 Ma).
- El inicio del PETM está dentro del error del tiempo estimado de ruptura continental (55.5 +/- 0.3 Ma).
Conclusiones:
- El volcanismo masivo en el este de Groenlandia está relacionado con el PETM.
- El PETM fue probablemente desencadenado por la interacción del magma con los sedimentos ricos en carbono cerca de la frontera de la placa de Groenlandia-Europa.
- Esta interacción liberó gases de efecto invernadero, causando el PETM.
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