Freshwater calcite precipitates from in vitro mesocosm flume experiments: a case for biomediation of tufas
Abstract Freshwater carbonates (tufas) develop today from the Arctic to the tropics, many being localized about springs and upper water courses. Some Quaternary tufas, especially in the Mediterranean region, extend over tens of square kilometres and exceed 30 m in thickness. Radiometric dating of Ho...
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crwiley:10.1111/j.1365-3091.2008.00983.x 2024-06-23T07:50:46+00:00 Freshwater calcite precipitates from in vitro mesocosm flume experiments: a case for biomediation of tufas PEDLEY, MARTYN ROGERSON, MIKE MIDDLETON, RICHARD 2009 http://dx.doi.org/10.1111/j.1365-3091.2008.00983.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3091.2008.00983.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3091.2008.00983.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Sedimentology volume 56, issue 2, page 511-527 ISSN 0037-0746 1365-3091 journal-article 2009 crwiley https://doi.org/10.1111/j.1365-3091.2008.00983.x 2024-06-13T04:20:30Z Abstract Freshwater carbonates (tufas) develop today from the Arctic to the tropics, many being localized about springs and upper water courses. Some Quaternary tufas, especially in the Mediterranean region, extend over tens of square kilometres and exceed 30 m in thickness. Radiometric dating of Holocene deposits shows that many have accumulated at an average rate of 1 mm year −1 . However, local precipitation may be much faster and some Holocene deposits may even have outpaced their tropical marine carbonate counterparts. Recently, the study of active sites has attempted to quantify the precipitation mechanisms which lead to tufa deposition. However, field observation and sampling procedures suffer from the inherent disadvantages of uncontrolled fluctuations in environmental conditions during the study programme. These disadvantages compromise any interpretations, particularly where controls on spar versus micrite precipitation are concerned. Many of these problems have been overcome in the current study by the construction and operation of laboratory mesocosm flumes which simulate the natural conditions (e.g. pH, flow rate, ambient temperature and daylight) in which freshwater carbonate (tufa) is deposited. Three mesocosms were supplied with natural river water from tufa precipitating streams and two mesocosms were supplied with UV‐treated (sterile) river water from the same source. One of the untreated flume mesocosms was linked with a calcium reactor, which replaced calcium ions removed during the precipitation process in order to maintain tufa growth over extended experimental runs. Low‐magnesium calcite precipitates (both rhombic sparite grown from long‐crystallite dendrites and short‐crystallite dendrite triad precursors) and micrite peloids (grown from spherulitic precursors) were precipitated in intimate association with biofilm (extracellular polymeric substances) within the four mesocosms supplied with natural river water. Virtually, no tufa‐like precipitate was obtained from the flumes supplied with ... Article in Journal/Newspaper Arctic Wiley Online Library Arctic Sedimentology 56 2 511 527 |
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Wiley Online Library |
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English |
description |
Abstract Freshwater carbonates (tufas) develop today from the Arctic to the tropics, many being localized about springs and upper water courses. Some Quaternary tufas, especially in the Mediterranean region, extend over tens of square kilometres and exceed 30 m in thickness. Radiometric dating of Holocene deposits shows that many have accumulated at an average rate of 1 mm year −1 . However, local precipitation may be much faster and some Holocene deposits may even have outpaced their tropical marine carbonate counterparts. Recently, the study of active sites has attempted to quantify the precipitation mechanisms which lead to tufa deposition. However, field observation and sampling procedures suffer from the inherent disadvantages of uncontrolled fluctuations in environmental conditions during the study programme. These disadvantages compromise any interpretations, particularly where controls on spar versus micrite precipitation are concerned. Many of these problems have been overcome in the current study by the construction and operation of laboratory mesocosm flumes which simulate the natural conditions (e.g. pH, flow rate, ambient temperature and daylight) in which freshwater carbonate (tufa) is deposited. Three mesocosms were supplied with natural river water from tufa precipitating streams and two mesocosms were supplied with UV‐treated (sterile) river water from the same source. One of the untreated flume mesocosms was linked with a calcium reactor, which replaced calcium ions removed during the precipitation process in order to maintain tufa growth over extended experimental runs. Low‐magnesium calcite precipitates (both rhombic sparite grown from long‐crystallite dendrites and short‐crystallite dendrite triad precursors) and micrite peloids (grown from spherulitic precursors) were precipitated in intimate association with biofilm (extracellular polymeric substances) within the four mesocosms supplied with natural river water. Virtually, no tufa‐like precipitate was obtained from the flumes supplied with ... |
format |
Article in Journal/Newspaper |
author |
PEDLEY, MARTYN ROGERSON, MIKE MIDDLETON, RICHARD |
spellingShingle |
PEDLEY, MARTYN ROGERSON, MIKE MIDDLETON, RICHARD Freshwater calcite precipitates from in vitro mesocosm flume experiments: a case for biomediation of tufas |
author_facet |
PEDLEY, MARTYN ROGERSON, MIKE MIDDLETON, RICHARD |
author_sort |
PEDLEY, MARTYN |
title |
Freshwater calcite precipitates from in vitro mesocosm flume experiments: a case for biomediation of tufas |
title_short |
Freshwater calcite precipitates from in vitro mesocosm flume experiments: a case for biomediation of tufas |
title_full |
Freshwater calcite precipitates from in vitro mesocosm flume experiments: a case for biomediation of tufas |
title_fullStr |
Freshwater calcite precipitates from in vitro mesocosm flume experiments: a case for biomediation of tufas |
title_full_unstemmed |
Freshwater calcite precipitates from in vitro mesocosm flume experiments: a case for biomediation of tufas |
title_sort |
freshwater calcite precipitates from in vitro mesocosm flume experiments: a case for biomediation of tufas |
publisher |
Wiley |
publishDate |
2009 |
url |
http://dx.doi.org/10.1111/j.1365-3091.2008.00983.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3091.2008.00983.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3091.2008.00983.x |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Sedimentology volume 56, issue 2, page 511-527 ISSN 0037-0746 1365-3091 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-3091.2008.00983.x |
container_title |
Sedimentology |
container_volume |
56 |
container_issue |
2 |
container_start_page |
511 |
op_container_end_page |
527 |
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1802641687863885824 |