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Modern freshwater microbialite analogues for ancient dendritic reef structures.
B Laval1, S L Cady, J C Pollack
1School of Engineering Science, Simon Fraser University, Burnaby, British Columbia, Canada.
Nature
|October 18, 2000
Summary
Researchers discovered modern freshwater microbialites in Canada with microstructures resembling ancient Epiphyton and Girvanella. These findings offer insights into the biogeochemical processes behind enigmatic Early Cambrian reef structures.
Area of Science:
- Geology
- Paleontology
- Microbiology
Background:
- Microbialites are ancient organosedimentary structures formed by diverse microorganisms.
- Early Cambrian reefs featured Epiphyton and Girvanella, but the processes forming them remain unclear.
- Modern microbialites offer potential analogues for studying ancient reef-building processes.
Purpose of the Study:
- To investigate modern freshwater microbialites in Pavilion Lake, British Columbia.
- To compare microstructures of modern microbialites with enigmatic Early Cambrian reef builders like Epiphyton and Girvanella.
- To explore the potential of these modern microbialites as analogues for ancient calcareous structures.
Main Methods:
- Field exploration and sampling of microbialites at varying depths in Pavilion Lake.
- Microstructural analysis of modern microbialites.
- Comparison of modern microbialite fabrics with fossilized Epiphyton and Girvanella structures.
Main Results:
- Discovery of a unique assemblage of freshwater calcite microbialites.
- Observed microstructures in modern microbialites that resemble those of ancient Epiphyton and Girvanella.
- Morphological variations with depth, including dendritic microstructures in deep-water mounds (>30m).
Conclusions:
- Modern microbialites from Pavilion Lake exhibit microstructural similarities to key Early Cambrian reef-building organisms.
- Deep-water microbialite morphologies suggest they may be modern analogues for ancient calcareous structures.
- These findings provide a valuable system for studying the biogeochemical interactions responsible for enigmatic Early Cambrian reef fabrics.
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