Geochemistry And Organic Petrology Of Boreal And Subarctic Peats In Canada
Five peat-forming environments were investigated for their organic petrological, mineralogical and geochemical characteristics. Wetlands studied included a salt marsh (Nova Scotia) and four peatlands: a freshwater domed bog (Nova Scotia), a fen (Alberta) and two peat plateau bogs (Northwest Territor...
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ftunivwestonta:oai:ir.lib.uwo.ca:digitizedtheses-3430 2023-10-01T03:58:24+02:00 Geochemistry And Organic Petrology Of Boreal And Subarctic Peats In Canada Chague, Catherine 1994-01-01T08:00:00Z application/pdf https://ir.lib.uwo.ca/digitizedtheses/2431 https://ir.lib.uwo.ca/context/digitizedtheses/article/3430/viewcontent/NN93183.PDF unknown Scholarship@Western https://ir.lib.uwo.ca/digitizedtheses/2431 https://ir.lib.uwo.ca/context/digitizedtheses/article/3430/viewcontent/NN93183.PDF Digitized Theses Geology text 1994 ftunivwestonta 2023-09-03T07:20:58Z Five peat-forming environments were investigated for their organic petrological, mineralogical and geochemical characteristics. Wetlands studied included a salt marsh (Nova Scotia) and four peatlands: a freshwater domed bog (Nova Scotia), a fen (Alberta) and two peat plateau bogs (Northwest Territories). These diverse localities provided the opportunity to assess the influence of natural and anthropogenic factors on peat geochemistry in different depositional environments. Core samples were analyzed using the following methods: organic petrology (maceral analysis and reflectance measurements), low and high temperature ashing, x-ray diffraction, INAA and sulfur analysis, ICP-MS, radiocarbon and cesium dating.;Changes in maceral composition generally correlate with shifts in reflectance, and are useful indicators of the degree of degradation and oxidation in various depositional environments. A downcore decrease of fluorescing and red reflecting huminite macerals shows an increase in the degree of degradation, while an abundance of pyrofusinite in certain intervals is indicative of periods of drought and fire activity. In the salt marsh, oxyfusinite and algae are common.;Br, Cl, I and Se exhibit a strong affinity with the organic fraction and are consequently enriched in peat. Distribution of elements associated with the inorganic fraction on the other hand, can generally be explained in terms of mineral matter distribution.;Peat acts as a sink for air- and waterborne elements. Main factors affecting elemental concentration and distribution are geology of the substratum, proximity to the marine environment, elemental affinity, permafrost, redox changes in the zone of water table fluctuation, tephra incorporation, botanical composition, plant bioaccumulation, degree of degradation of peat, and anthropogenic activity. In particular, a substantial enrichment immediately above the permafrost boundary reflects the influence of permafrost on the mobilization of elements.;Framboidal and anhedral pyrite crystals occurring ... Text Northwest Territories Peat Peat plateau permafrost Subarctic The University of Western Ontario: Scholarship@Western Canada Northwest Territories |
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Open Polar |
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The University of Western Ontario: Scholarship@Western |
op_collection_id |
ftunivwestonta |
language |
unknown |
topic |
Geology |
spellingShingle |
Geology Chague, Catherine Geochemistry And Organic Petrology Of Boreal And Subarctic Peats In Canada |
topic_facet |
Geology |
description |
Five peat-forming environments were investigated for their organic petrological, mineralogical and geochemical characteristics. Wetlands studied included a salt marsh (Nova Scotia) and four peatlands: a freshwater domed bog (Nova Scotia), a fen (Alberta) and two peat plateau bogs (Northwest Territories). These diverse localities provided the opportunity to assess the influence of natural and anthropogenic factors on peat geochemistry in different depositional environments. Core samples were analyzed using the following methods: organic petrology (maceral analysis and reflectance measurements), low and high temperature ashing, x-ray diffraction, INAA and sulfur analysis, ICP-MS, radiocarbon and cesium dating.;Changes in maceral composition generally correlate with shifts in reflectance, and are useful indicators of the degree of degradation and oxidation in various depositional environments. A downcore decrease of fluorescing and red reflecting huminite macerals shows an increase in the degree of degradation, while an abundance of pyrofusinite in certain intervals is indicative of periods of drought and fire activity. In the salt marsh, oxyfusinite and algae are common.;Br, Cl, I and Se exhibit a strong affinity with the organic fraction and are consequently enriched in peat. Distribution of elements associated with the inorganic fraction on the other hand, can generally be explained in terms of mineral matter distribution.;Peat acts as a sink for air- and waterborne elements. Main factors affecting elemental concentration and distribution are geology of the substratum, proximity to the marine environment, elemental affinity, permafrost, redox changes in the zone of water table fluctuation, tephra incorporation, botanical composition, plant bioaccumulation, degree of degradation of peat, and anthropogenic activity. In particular, a substantial enrichment immediately above the permafrost boundary reflects the influence of permafrost on the mobilization of elements.;Framboidal and anhedral pyrite crystals occurring ... |
format |
Text |
author |
Chague, Catherine |
author_facet |
Chague, Catherine |
author_sort |
Chague, Catherine |
title |
Geochemistry And Organic Petrology Of Boreal And Subarctic Peats In Canada |
title_short |
Geochemistry And Organic Petrology Of Boreal And Subarctic Peats In Canada |
title_full |
Geochemistry And Organic Petrology Of Boreal And Subarctic Peats In Canada |
title_fullStr |
Geochemistry And Organic Petrology Of Boreal And Subarctic Peats In Canada |
title_full_unstemmed |
Geochemistry And Organic Petrology Of Boreal And Subarctic Peats In Canada |
title_sort |
geochemistry and organic petrology of boreal and subarctic peats in canada |
publisher |
Scholarship@Western |
publishDate |
1994 |
url |
https://ir.lib.uwo.ca/digitizedtheses/2431 https://ir.lib.uwo.ca/context/digitizedtheses/article/3430/viewcontent/NN93183.PDF |
geographic |
Canada Northwest Territories |
geographic_facet |
Canada Northwest Territories |
genre |
Northwest Territories Peat Peat plateau permafrost Subarctic |
genre_facet |
Northwest Territories Peat Peat plateau permafrost Subarctic |
op_source |
Digitized Theses |
op_relation |
https://ir.lib.uwo.ca/digitizedtheses/2431 https://ir.lib.uwo.ca/context/digitizedtheses/article/3430/viewcontent/NN93183.PDF |
_version_ |
1778531143736360960 |