Bacterially induced precipitation of CaCO 3 : An example from studies of cyanobacterial mats. Final report
Bacteria induce the precipitation of calcium carbonate in the laboratory and in nature by altering their chemical environment. Geologists are recognizing the possibility that bacterially induced precipitates may form significant mineral deposits, unfortunately, there are currently no sound criteria...
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ftosti:oai:osti.gov:10171562 2023-07-30T04:02:29+02:00 Bacterially induced precipitation of CaCO 3 : An example from studies of cyanobacterial mats. Final report Chafetz, Henry S. 2017-05-09 application/pdf http://www.osti.gov/servlets/purl/10171562 https://www.osti.gov/biblio/10171562 https://doi.org/10.2172/10171562 unknown http://www.osti.gov/servlets/purl/10171562 https://www.osti.gov/biblio/10171562 https://doi.org/10.2172/10171562 doi:10.2172/10171562 54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES CARBON CYCLE CYANOBACTERIA WATER CHEMISTRY LIMESTONE ELECTRON MICROSCOPY CLIMATIC CHANGE CALCIUM CARBONATES TEXAS BAHAMA ISLANDS PROGRESS REPORT 2017 ftosti https://doi.org/10.2172/10171562 2023-07-11T11:00:45Z Bacteria induce the precipitation of calcium carbonate in the laboratory and in nature by altering their chemical environment. Geologists are recognizing the possibility that bacterially induced precipitates may form significant mineral deposits, unfortunately, there are currently no sound criteria by which they can be recognized in recent sediments, or in the rock record. Cultures of aerobic and facultative bacteria from cyanobacterial mats on Andros Island, Bahamas, and Baffin Bay, Texas, induced the precipitation of calcium carbonate under controlled conditions. Crusts, the largest features formed, are composed of 5--200μm diameter bundles which are, in turn, composed of numerous individual crystals. The smallest observed features are 0.1--0.4μm spheres and rods which comprise some individual crystals and crystal bundles. Crystal bundles resembling rhombohedra, tetragonal disphenoids, tetragonal dipyramids, and calcite dumbbells appear to be uniquely bacterial in origin, and they have all been observed in recent sediments. Swollen rods, discs, curved dumbbells, and 50--200μm optically continuous crystals resembling brushes may be uniquely bacterial in origin, however, they have not been reported by other laboratories nor observed in natural settings. Presence of any of these forms in recent sediments should be taken as strong evidence for bacterial influence. Spheres and aragonite dumbbells have also been observed in natural environments, however, they are not always bacterial in origin. Precipitation of calcium carbonate occurs preferentially on dead cyanobacteria in the presence of bacteria. Lithification of algal mats to form stromatolites may take place in the zone of decaying organic matter due to bacterial activity. Other/Unknown Material Baffin Bay SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Baffin Bay |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES CARBON CYCLE CYANOBACTERIA WATER CHEMISTRY LIMESTONE ELECTRON MICROSCOPY CLIMATIC CHANGE CALCIUM CARBONATES TEXAS BAHAMA ISLANDS PROGRESS REPORT |
spellingShingle |
54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES CARBON CYCLE CYANOBACTERIA WATER CHEMISTRY LIMESTONE ELECTRON MICROSCOPY CLIMATIC CHANGE CALCIUM CARBONATES TEXAS BAHAMA ISLANDS PROGRESS REPORT Chafetz, Henry S. Bacterially induced precipitation of CaCO 3 : An example from studies of cyanobacterial mats. Final report |
topic_facet |
54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES CARBON CYCLE CYANOBACTERIA WATER CHEMISTRY LIMESTONE ELECTRON MICROSCOPY CLIMATIC CHANGE CALCIUM CARBONATES TEXAS BAHAMA ISLANDS PROGRESS REPORT |
description |
Bacteria induce the precipitation of calcium carbonate in the laboratory and in nature by altering their chemical environment. Geologists are recognizing the possibility that bacterially induced precipitates may form significant mineral deposits, unfortunately, there are currently no sound criteria by which they can be recognized in recent sediments, or in the rock record. Cultures of aerobic and facultative bacteria from cyanobacterial mats on Andros Island, Bahamas, and Baffin Bay, Texas, induced the precipitation of calcium carbonate under controlled conditions. Crusts, the largest features formed, are composed of 5--200μm diameter bundles which are, in turn, composed of numerous individual crystals. The smallest observed features are 0.1--0.4μm spheres and rods which comprise some individual crystals and crystal bundles. Crystal bundles resembling rhombohedra, tetragonal disphenoids, tetragonal dipyramids, and calcite dumbbells appear to be uniquely bacterial in origin, and they have all been observed in recent sediments. Swollen rods, discs, curved dumbbells, and 50--200μm optically continuous crystals resembling brushes may be uniquely bacterial in origin, however, they have not been reported by other laboratories nor observed in natural settings. Presence of any of these forms in recent sediments should be taken as strong evidence for bacterial influence. Spheres and aragonite dumbbells have also been observed in natural environments, however, they are not always bacterial in origin. Precipitation of calcium carbonate occurs preferentially on dead cyanobacteria in the presence of bacteria. Lithification of algal mats to form stromatolites may take place in the zone of decaying organic matter due to bacterial activity. |
author |
Chafetz, Henry S. |
author_facet |
Chafetz, Henry S. |
author_sort |
Chafetz, Henry S. |
title |
Bacterially induced precipitation of CaCO 3 : An example from studies of cyanobacterial mats. Final report |
title_short |
Bacterially induced precipitation of CaCO 3 : An example from studies of cyanobacterial mats. Final report |
title_full |
Bacterially induced precipitation of CaCO 3 : An example from studies of cyanobacterial mats. Final report |
title_fullStr |
Bacterially induced precipitation of CaCO 3 : An example from studies of cyanobacterial mats. Final report |
title_full_unstemmed |
Bacterially induced precipitation of CaCO 3 : An example from studies of cyanobacterial mats. Final report |
title_sort |
bacterially induced precipitation of caco 3 : an example from studies of cyanobacterial mats. final report |
publishDate |
2017 |
url |
http://www.osti.gov/servlets/purl/10171562 https://www.osti.gov/biblio/10171562 https://doi.org/10.2172/10171562 |
geographic |
Baffin Bay |
geographic_facet |
Baffin Bay |
genre |
Baffin Bay |
genre_facet |
Baffin Bay |
op_relation |
http://www.osti.gov/servlets/purl/10171562 https://www.osti.gov/biblio/10171562 https://doi.org/10.2172/10171562 doi:10.2172/10171562 |
op_doi |
https://doi.org/10.2172/10171562 |
_version_ |
1772813301463384064 |