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Liberación de sulfuro de hidrógeno a las aguas superficiales en el límite Precámbrico/Cámbrico

Martin Wille¹, Thomas F Nägler, Bernd Lehmann

¹Institute of Geological Sciences, University of Bern, Baltzerstrasse 3, 3012 Bern, Switzerland. martin.wille@anu.edu.au

|May 30, 2008

Resumen

La explosión cámbrica, un rápido aumento en la vida animal, puede haber sido provocada por cambios en la circulación oceánica. La intensa afluencia de aguas oceánicas profundas siguió a la transición Precámbrico / Cámbrico, alterando los entornos marinos.

Área de la Ciencia:

La geoquímica es la geoquímica.
La paleoceanografía es la paleoceanografía.
Paleontología Paleontología.

Sus antecedentes:

La transición entre el Precámbrico y el Cámbrico (hace unos 542 millones de años) fue testigo de la aparición de fósiles multicelulares de tipo animal y de la "explosión del Cámbrico".
Los cambios ambientales en esta transición se debaten como una causa de la explosión cámbrica.
Comprender las condiciones oceánicas durante este período es crucial para explicar la diversificación temprana de los animales.

Objetivo del estudio:

Investigar las condiciones ambientales durante la transición Precámbrico-Cámbrico.
Para entender los desencadenantes potenciales de la explosión cámbrica.

Principales métodos:

Análisis de las firmas de isótopos de molibdeno en las pizarras negras del límite precámbrico-cámbrico.
Utilizando un modelo de caja del ciclo oceánico del molibdeno.

Principales resultados:

Se detectó una señal de isótopo de molibdeno transitorio inmediatamente después de la transición Precámbrico-Cámbrico.
La mejor explicación de la señal observada es el intenso surgimiento de agua oceánica profunda rica en sulfuro de hidrógeno.
Esto sugiere que se produjo un cambio importante en la circulación oceánica.

Conclusiones:

La radiación animal del Cámbrico Temprano puede haber sido provocada por un cambio significativo en la circulación oceánica.
Este cambio puso fin a un período prolongado de condiciones de océano profundo estratificadas y sulfúricas.
Los hallazgos proporcionan una nueva perspectiva sobre los impulsores ambientales de la evolución animal temprana.

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