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La disociación masiva del hidrato de gas durante un evento anóxico oceánico del Jurásico
1Department of Earth Sciences, University of Oxford, UK. stephen.hesselbo@earth.ox.ac.uk
Nature
|August 10, 2000
Resumen
Durante el Tarciano Temprano, la liberación de metano de los hidratos de gas probablemente causó una amplia difusión de isótopos ligeros de carbono en los depósitos de la Tierra, a pesar de las altas tasas de entierro de carbono orgánico. Este evento ocurrió hace unos 183 millones de años.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- La geoquímica es la geoquímica.
- Paleontología Paleontología.
Sus antecedentes:
- El evento anóxico oceánico del Tarciano Temprano (aprox. 183 millones de años) está relacionado con el enterramiento de alto contenido de carbono orgánico, temperaturas elevadas y extinciones masivas.
- Las explicaciones anteriores para los isótopos ligeros de carbono durante este período se centraron en el surgimiento localizado.
- Los isótopos pesados de carbono en rocas y fósiles se atribuyeron al enterramiento de carbono orgánico ligero.
Objetivo del estudio:
- Para investigar la fuente de isótopos ligeros de carbono durante el evento anóxico oceánico del Tarciano Temprano.
- Para determinar si el flujo ascendente localizado podría explicar las anomalías globales del isótopo de carbono.
- Proponer un mecanismo alternativo para los patrones de isótopos de carbono observados.
Principales métodos:
- Análisis de isótopos de carbono de madera fósil del período del Tarcio temprano.
- Comparación de los datos isotópicos de la madera fósil con los datos existentes de materia orgánica marina, rocas y fósiles.
- Modelado de perturbaciones potenciales del ciclo del carbono.
Principales resultados:
- La madera fósil reveló que el carbono isotópicamente ligero dominaba los reservorios oceánicos, biosféricos y atmosféricos.
- Estas firmas ligeras de carbono persistieron en todo el mundo, incluso con altas tasas de entierro de carbono orgánico.
- Los hallazgos contradicen las explicaciones basadas únicamente en el surgimiento localizado.
Conclusiones:
- Las amplias firmas de isótopos de carbono ligero sugieren una perturbación global del ciclo del carbono.
- Una liberación voluminosa y rápida de metano de los hidratos de gas marino se propone como el conductor principal.
- Este evento de liberación de metano es análogo a los mecanismos propuestos para el máximo térmico del Paleoceno Tardío.
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