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Los análogos modernos de microbialitos de agua dulce para antiguas estructuras de arrecifes dendríticos
B Laval1, S L Cady, J C Pollack
1School of Engineering Science, Simon Fraser University, Burnaby, British Columbia, Canada.
Nature
|October 18, 2000
Resumen
Los investigadores descubrieron microbialitos modernos de agua dulce en Canadá con microestructuras que se asemejan a las antiguas Epiphyton y Girvanella. Estos hallazgos ofrecen información sobre los procesos biogeoquímicos detrás de las enigmáticas estructuras de arrecifes del Cámbrico Temprano.
Área de la Ciencia:
- Geología Geología Geología.
- Paleontología Paleontología.
- Microbiología Microbiología.
Sus antecedentes:
- Las microbiálitas son antiguas estructuras organosedimentarias formadas por diversos microorganismos.
- Los arrecifes del Cámbrico temprano presentaban Epiphyton y Girvanella, pero los procesos que los formaron siguen sin estar claros.
- Los microbialitos modernos ofrecen posibles análogos para el estudio de los antiguos procesos de construcción de arrecifes.
Objetivo del estudio:
- Para investigar los microbialitos modernos de agua dulce en el lago Pavilion, Columbia Británica.
- Para comparar las microestructuras de los microbialitos modernos con los enigmáticos constructores de arrecifes del Cámbrico temprano como Epiphyton y Girvanella.
- Explorar el potencial de estos microbialitos modernos como análogos de las antiguas estructuras calcáreas.
Principales métodos:
- Exploración de campo y muestreo de microbialitos a diferentes profundidades en el lago Pavilion.
- Análisis microestructural de las microbialitas modernas.
- Comparación de las telas modernas de microbialita con las estructuras fosilizadas de Epiphyton y Girvanella.
Principales resultados:
- Descubrimiento de un conjunto único de microbialitos de calcita de agua dulce.
- Se han observado microestructuras en los microbialitos modernos que se asemejan a las de los antiguos Epiphyton y Girvanella.
- Variaciones morfológicas con la profundidad, incluyendo microestructuras dendríticas en montículos de aguas profundas (>30m).
Conclusiones:
- Los microbialitos modernos del Lago Pabellón exhiben similitudes microstruturales con los principales organismos constructores de arrecifes del Cámbrico Temprano.
- Las morfologías de microbialitos de aguas profundas sugieren que pueden ser análogos modernos de antiguas estructuras calcáreas.
- Estos hallazgos proporcionan un sistema valioso para estudiar las interacciones biogeoquímicas responsables de las enigmáticas telas de arrecifes del Cámbrico Temprano.
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