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- Publisher
- Wiley
- Copyright
- "Copyright © 1986 Wiley Subscription Services, Inc., A Wiley Company"
- ISSN
- 1000-9515
- eISSN
- 1755-6724
- DOI
- 10.1111/j.1755-6724.1986.mp60004007.x
- Publisher site
- See Article on Publisher Site
Abstract
Abstract The source of silica in the formation of the Precambrian laminated cherts has long remained a problem to be solved. Through experiments on cherts and living blue‐green algae, the authors found that the collected chert samples probably come from primary deposits, and there is a great biomass of fossil algae in chert, among which the filamentous algae can be compared with the living blue‐green algae Oscillatoria; that a higher Pco2 of the gas would be favourable for the increase of the biomass of living blue‐green algae and consequently raises the pH value of the water body; and that lack of free oxygen and a higher concentration of SiO2 in the water have no apparent influence on the biomass of blue‐green algae. Based on the evidence above, a biogeochemical model concerning the origin of Precambrian laminated chert has been set up, in which the photosynthesis of algae under the presumed atmospheric conditions of the Precambrian might raise the pH value of the water body and promote the dissolution of silicate minerals, thus providing a source of colloid SiO2 for the formation of Precambrian laminated chert.
Journal
Acta Geologica Sinica (English Edition) – Wiley
Published: Nov 1, 1986