Bacterially induced precipitation of CaCO{sub 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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Texas Univ., Houston, TX (United States)
1990
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ftunivnotexas:info:ark/67531/metadc1384882 2023-05-15T15:35:06+02:00 Bacterially induced precipitation of CaCO{sub 3}: An example from studies of cyanobacterial mats. Final report Chafetz, H. S. United States. Department of Energy. 1990-04-30 174 p. Text https://digital.library.unt.edu/ark:/67531/metadc1384882/ English eng Texas Univ., Houston, TX (United States) other: DE92019050 rep-no: DOE/ER/13771--1 grantno: FG05-87ER13771 osti: 10171562 https://digital.library.unt.edu/ark:/67531/metadc1384882/ ark: ark:/67531/metadc1384882 Other Information: DN: Contains thesis by Chris Buczynski: Characteristics of bacterially induced precipitates of calcium carbonate from the laboratory, and from cyanobacterial mats of Baffin Bay, Texas, and Andros Island, Bahamas; TH: Thesis (Ph.D.) Limestone Climatic Change Basic Studies Progress Report 540110 Electron Microscopy 540210 580000 Bahama Islands 58 Geosciences Water Chemistry Carbon Cycle Cyanobacteria 54 Environmental Sciences Geosciences Texas Calcium Carbonates Thesis or Dissertation 1990 ftunivnotexas 2019-02-16T23:08:22Z 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--200{mu}m diameter bundles which are, in turn, composed of numerous individual crystals. The smallest observed features are 0.1--0.4{mu}m 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--200{mu}m 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. Thesis Baffin Bay University of North Texas: UNT Digital Library Baffin Bay |
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University of North Texas: UNT Digital Library |
op_collection_id |
ftunivnotexas |
language |
English |
topic |
Limestone Climatic Change Basic Studies Progress Report 540110 Electron Microscopy 540210 580000 Bahama Islands 58 Geosciences Water Chemistry Carbon Cycle Cyanobacteria 54 Environmental Sciences Geosciences Texas Calcium Carbonates |
spellingShingle |
Limestone Climatic Change Basic Studies Progress Report 540110 Electron Microscopy 540210 580000 Bahama Islands 58 Geosciences Water Chemistry Carbon Cycle Cyanobacteria 54 Environmental Sciences Geosciences Texas Calcium Carbonates Chafetz, H. S. Bacterially induced precipitation of CaCO{sub 3}: An example from studies of cyanobacterial mats. Final report |
topic_facet |
Limestone Climatic Change Basic Studies Progress Report 540110 Electron Microscopy 540210 580000 Bahama Islands 58 Geosciences Water Chemistry Carbon Cycle Cyanobacteria 54 Environmental Sciences Geosciences Texas Calcium Carbonates |
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--200{mu}m diameter bundles which are, in turn, composed of numerous individual crystals. The smallest observed features are 0.1--0.4{mu}m 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--200{mu}m 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. |
author2 |
United States. Department of Energy. |
format |
Thesis |
author |
Chafetz, H. S. |
author_facet |
Chafetz, H. S. |
author_sort |
Chafetz, H. S. |
title |
Bacterially induced precipitation of CaCO{sub 3}: An example from studies of cyanobacterial mats. Final report |
title_short |
Bacterially induced precipitation of CaCO{sub 3}: An example from studies of cyanobacterial mats. Final report |
title_full |
Bacterially induced precipitation of CaCO{sub 3}: An example from studies of cyanobacterial mats. Final report |
title_fullStr |
Bacterially induced precipitation of CaCO{sub 3}: An example from studies of cyanobacterial mats. Final report |
title_full_unstemmed |
Bacterially induced precipitation of CaCO{sub 3}: An example from studies of cyanobacterial mats. Final report |
title_sort |
bacterially induced precipitation of caco{sub 3}: an example from studies of cyanobacterial mats. final report |
publisher |
Texas Univ., Houston, TX (United States) |
publishDate |
1990 |
url |
https://digital.library.unt.edu/ark:/67531/metadc1384882/ |
geographic |
Baffin Bay |
geographic_facet |
Baffin Bay |
genre |
Baffin Bay |
genre_facet |
Baffin Bay |
op_source |
Other Information: DN: Contains thesis by Chris Buczynski: Characteristics of bacterially induced precipitates of calcium carbonate from the laboratory, and from cyanobacterial mats of Baffin Bay, Texas, and Andros Island, Bahamas; TH: Thesis (Ph.D.) |
op_relation |
other: DE92019050 rep-no: DOE/ER/13771--1 grantno: FG05-87ER13771 osti: 10171562 https://digital.library.unt.edu/ark:/67531/metadc1384882/ ark: ark:/67531/metadc1384882 |
_version_ |
1766365405702520832 |