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Record Details

Record 20 of 1527
Modern freshwater microbialite analogues for ancient dendritic reef structures
External Online Source: doi:10.1038/35036579
Author and Affiliation:
Laval, B.(School of Engineering Science, Simon Fraser University, Burnaby, British Columbia, Canada)
Cady, S. L.
Pollack, J. C.
McKay, C. P.
Bird, J. S.
Grotzinger, J. P.
Ford, D. C.
Bohm, H. R.
Abstract: Microbialites are organosedimentary structures that can be constructed by a variety of metabolically distinct taxa. Consequently, microbialite structures abound in the fossil record, although the exact nature of the biogeochemical processes that produced them is often unknown. One such class of ancient calcareous structures, Epiphyton and Girvanella, appear in great abundance during the Early Cambrian. Together with Archeocyathids, stromatolites and thrombolites, they formed major Cambrian reef belts. To a large extent, Middle to Late Cambrian reefs are similar to Precambrian reefs, with the exception that the latter, including terminal Proterozoic reefs, do not contain Epiphyton or Girvanella. Here we report the discovery in Pavilion Lake, British Columbia, Canada, of a distinctive assemblage of freshwater calcite microbialites, some of which display microstructures similar to the fabrics displayed by Epiphyton and Girvanella. The morphologies of the modern microbialites vary with depth, and dendritic microstructures of the deep water (> 30 m) mounds indicate that they may be modern analogues for the ancient calcareous structures. These microbialites thus provide an opportunity to study the biogeochemical interactions that produce fabrics similar to those of some enigmatic Early Cambrian reef structures.
Publication Date: Oct 05, 2000
Document ID:
20040112714
(Acquired Oct 05, 2004)
Subject Category: GEOSCIENCES (GENERAL)
Document Type: Journal Article
Publication Information: Nature (ISSN 0028-0836); Volume 407; 6804; 626-9
Publisher Information: United Kingdom
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ANALOGS; FOSSILS; FRESH WATER; MICROBIOLOGY; REEFS; BACTERIA; BLUE GREEN ALGAE; BRITISH COLUMBIA; ECOSYSTEMS; EVOLUTION; EXOBIOLOGY
Other Descriptors: FOSSILS; WATER MICROBIOLOGY; BACTERIA; BRITISH COLUMBIA; CYANOBACTERIA; ECOSYSTEM; EVOLUTION; NASA CENTER ARC; NASA DISCIPLINE EXOBIOLOGY; NON-NASA CENTER
Availability Source: Other Sources
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