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Permanent link (DOI): https://doi.org/10.7939/R3VW90

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Freshwater microbialites from Laguna Bacalar, Quintana Roo, Mexico: effects controlling their growth Open Access

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Other title
Subject/Keyword
Geochemistry
Microbialites
Laguna Bacalar
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Castro, Set, I
Supervisor and department
Gingras, Murray (EAS)
Konhauser, Kurt (EAS)
Examining committee member and department
Zonneveld, John-Paul (EAS)
Department
Department of Earth and Atmospheric Sciences
Specialization

Date accepted
2014-06-18T14:50:09Z
Graduation date
2014-11
Degree
Master of Science
Degree level
Master's
Abstract
Microbialites are among the oldest direct evidence of life on Earth. They reached their greatest abundance and diversity during the Proterozoic and decline thereafter. The decline has been attributed to grazing and/or burrowing by metazoan, to changes in ocean chemistry leading to a drop in carbonate saturation, or to substrate and elemental competition with other organisms capable of precipitating calcium carbonate (CaCO3). Here we examine the freshwater microbialites of Laguna Bacalar (Mexico) in hope of better understanding the various factors controlling their growth, and internal fabric. It was concluded that microbialite growth was controlled by the supersaturation of water with regards to CaCO3, however, the laminated (stromatolitic) and clotted (thrombolitic) fabric were dependent on sediment transport and availability. The presence of gastropods and bivalves appeared not to influence growth due to the fast growth rate employed by microbialites as well as to the endolithic growth of the cyanobacteria present.
Language
English
DOI
doi:10.7939/R3VW90
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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