Postglacial development of a marl and peat complex on the Precambrian Shield of northwestern Ontario
Identifieur interne : 000D03 ( Istex/Corpus ); précédent : 000D02; suivant : 000D04Postglacial development of a marl and peat complex on the Precambrian Shield of northwestern Ontario
Auteurs : S. H. Mcintyre ; H. C. Duthie ; B. C. WarnerSource :
- Journal of Paleolimnology [ 0921-2728 ] ; 1991-01-01.
Abstract
Abstract: This paper presents the first paleolimnological study of the postglacial development of a marl and peat complex on the Canadian Precambrian Shield. Ring Lake (48° 46′ N, 85° 51′ W), situated within the carbonate glacial drift area of northwestern Ontario, originated about 9000 BP in a basin exposed by the retreating waters of proglacial Lake Superior. The development of Ring Lake was interpreted from pollen and diatom analysis of one sediment core from the littoral zone and another core from near the lake centre. The sequence of postglacial vegetation development parallels published accounts of forest history in northern Ontario. The predominant diatom throughout the littoral core was the alkaliphilous Cymbella diluviana. The central core was dominated by circumneutral and alkaliphilous species of Achnanthes Navicula, Fragilaria, and Cymbella, except in recent samples where acidophilous species of Anomoeoneis were common. Diatom-inferred (DI) pH shows that the early lake was alkaline because of drainage from base-rich tills. The presence of marl in the littoral core indicates deposition of calcareous materials until the site dried out during the Hypsithermal period. There is evidence that beaver activity around 5000 BP caused a temporary change in lake hydrology. A decline in DI pH over much of the postglacial reflects gradual exhaustion of carbonates in the drainage area. An increase in acidophilous diatoms in samples representing the past 3500 y is consistent with gradual acidification of the system and development of a littoral peatland in a cooler neoglacial climate.
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DOI: 10.1007/BF00153738
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<front><div type="abstract" xml:lang="en">Abstract: This paper presents the first paleolimnological study of the postglacial development of a marl and peat complex on the Canadian Precambrian Shield. Ring Lake (48° 46′ N, 85° 51′ W), situated within the carbonate glacial drift area of northwestern Ontario, originated about 9000 BP in a basin exposed by the retreating waters of proglacial Lake Superior. The development of Ring Lake was interpreted from pollen and diatom analysis of one sediment core from the littoral zone and another core from near the lake centre. The sequence of postglacial vegetation development parallels published accounts of forest history in northern Ontario. The predominant diatom throughout the littoral core was the alkaliphilous Cymbella diluviana. The central core was dominated by circumneutral and alkaliphilous species of Achnanthes Navicula, Fragilaria, and Cymbella, except in recent samples where acidophilous species of Anomoeoneis were common. Diatom-inferred (DI) pH shows that the early lake was alkaline because of drainage from base-rich tills. The presence of marl in the littoral core indicates deposition of calcareous materials until the site dried out during the Hypsithermal period. There is evidence that beaver activity around 5000 BP caused a temporary change in lake hydrology. A decline in DI pH over much of the postglacial reflects gradual exhaustion of carbonates in the drainage area. An increase in acidophilous diatoms in samples representing the past 3500 y is consistent with gradual acidification of the system and development of a littoral peatland in a cooler neoglacial climate.</div>
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<abstract>Abstract: This paper presents the first paleolimnological study of the postglacial development of a marl and peat complex on the Canadian Precambrian Shield. Ring Lake (48° 46′ N, 85° 51′ W), situated within the carbonate glacial drift area of northwestern Ontario, originated about 9000 BP in a basin exposed by the retreating waters of proglacial Lake Superior. The development of Ring Lake was interpreted from pollen and diatom analysis of one sediment core from the littoral zone and another core from near the lake centre. The sequence of postglacial vegetation development parallels published accounts of forest history in northern Ontario. The predominant diatom throughout the littoral core was the alkaliphilous Cymbella diluviana. The central core was dominated by circumneutral and alkaliphilous species of Achnanthes Navicula, Fragilaria, and Cymbella, except in recent samples where acidophilous species of Anomoeoneis were common. Diatom-inferred (DI) pH shows that the early lake was alkaline because of drainage from base-rich tills. The presence of marl in the littoral core indicates deposition of calcareous materials until the site dried out during the Hypsithermal period. There is evidence that beaver activity around 5000 BP caused a temporary change in lake hydrology. A decline in DI pH over much of the postglacial reflects gradual exhaustion of carbonates in the drainage area. An increase in acidophilous diatoms in samples representing the past 3500 y is consistent with gradual acidification of the system and development of a littoral peatland in a cooler neoglacial climate.</abstract>
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<abstract xml:lang="en"><p>Abstract: This paper presents the first paleolimnological study of the postglacial development of a marl and peat complex on the Canadian Precambrian Shield. Ring Lake (48° 46′ N, 85° 51′ W), situated within the carbonate glacial drift area of northwestern Ontario, originated about 9000 BP in a basin exposed by the retreating waters of proglacial Lake Superior. The development of Ring Lake was interpreted from pollen and diatom analysis of one sediment core from the littoral zone and another core from near the lake centre. The sequence of postglacial vegetation development parallels published accounts of forest history in northern Ontario. The predominant diatom throughout the littoral core was the alkaliphilous Cymbella diluviana. The central core was dominated by circumneutral and alkaliphilous species of Achnanthes Navicula, Fragilaria, and Cymbella, except in recent samples where acidophilous species of Anomoeoneis were common. Diatom-inferred (DI) pH shows that the early lake was alkaline because of drainage from base-rich tills. The presence of marl in the littoral core indicates deposition of calcareous materials until the site dried out during the Hypsithermal period. There is evidence that beaver activity around 5000 BP caused a temporary change in lake hydrology. A decline in DI pH over much of the postglacial reflects gradual exhaustion of carbonates in the drainage area. An increase in acidophilous diatoms in samples representing the past 3500 y is consistent with gradual acidification of the system and development of a littoral peatland in a cooler neoglacial climate.</p>
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<Para>This paper presents the first paleolimnological study of the postglacial development of a marl and peat complex on the Canadian Precambrian Shield. Ring Lake (48° 46′ N, 85° 51′ W), situated within the carbonate glacial drift area of northwestern Ontario, originated about 9000 BP in a basin exposed by the retreating waters of proglacial Lake Superior. The development of Ring Lake was interpreted from pollen and diatom analysis of one sediment core from the littoral zone and another core from near the lake centre.</Para>
<Para>The sequence of postglacial vegetation development parallels published accounts of forest history in northern Ontario. The predominant diatom throughout the littoral core was the alkaliphilous <Emphasis Type="Italic">Cymbella diluviana</Emphasis>
. The central core was dominated by circumneutral and alkaliphilous species of <Emphasis Type="Italic">Achnanthes Navicula, Fragilaria</Emphasis>
, and <Emphasis Type="Italic">Cymbella</Emphasis>
, except in recent samples where acidophilous species of <Emphasis Type="Italic">Anomoeoneis</Emphasis>
were common.</Para>
<Para>Diatom-inferred (DI) pH shows that the early lake was alkaline because of drainage from base-rich tills. The presence of marl in the littoral core indicates deposition of calcareous materials until the site dried out during the Hypsithermal period. There is evidence that beaver activity around 5000 BP caused a temporary change in lake hydrology. A decline in DI pH over much of the postglacial reflects gradual exhaustion of carbonates in the drainage area. An increase in acidophilous diatoms in samples representing the past 3500 y is consistent with gradual acidification of the system and development of a littoral peatland in a cooler neoglacial climate.</Para>
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<Keyword>Hypsithermal</Keyword>
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<mods version="3.6"><titleInfo lang="en"><title>Postglacial development of a marl and peat complex on the Precambrian Shield of northwestern Ontario</title>
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<titleInfo type="alternative" contentType="CDATA" lang="en"><title>Postglacial development of a marl and peat complex on the Precambrian Shield of northwestern Ontario</title>
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<name type="personal"><namePart type="given">S.</namePart>
<namePart type="given">H.</namePart>
<namePart type="family">McIntyre</namePart>
<affiliation>Department of Biology, University of Waterloo, N2L 3G1, Waterloo, Ontario, Canada</affiliation>
<affiliation>Quaternary Sciences Institute, University of Waterloo, N2L 3G1, Waterloo, Ontario, Canada</affiliation>
<role><roleTerm type="text">author</roleTerm>
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</name>
<name type="personal"><namePart type="given">H.</namePart>
<namePart type="given">C.</namePart>
<namePart type="family">Duthie</namePart>
<affiliation>Department of Biology, University of Waterloo, N2L 3G1, Waterloo, Ontario, Canada</affiliation>
<affiliation>Quaternary Sciences Institute, University of Waterloo, N2L 3G1, Waterloo, Ontario, Canada</affiliation>
<role><roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal"><namePart type="given">B.</namePart>
<namePart type="given">C.</namePart>
<namePart type="family">Warner</namePart>
<affiliation>Department of Geography, University of Waterloo, N2L 3G1, Waterloo, Ontario, Canada</affiliation>
<affiliation>Quaternary Sciences Institute, University of Waterloo, N2L 3G1, Waterloo, Ontario, Canada</affiliation>
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<originInfo><publisher>Kluwer Academic Publishers</publisher>
<place><placeTerm type="text">Dordrecht</placeTerm>
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<dateCreated encoding="w3cdtf">1991-05-27</dateCreated>
<dateIssued encoding="w3cdtf">1991-01-01</dateIssued>
<copyrightDate encoding="w3cdtf">1991</copyrightDate>
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<language><languageTerm type="code" authority="rfc3066">en</languageTerm>
<languageTerm type="code" authority="iso639-2b">eng</languageTerm>
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<abstract lang="en">Abstract: This paper presents the first paleolimnological study of the postglacial development of a marl and peat complex on the Canadian Precambrian Shield. Ring Lake (48° 46′ N, 85° 51′ W), situated within the carbonate glacial drift area of northwestern Ontario, originated about 9000 BP in a basin exposed by the retreating waters of proglacial Lake Superior. The development of Ring Lake was interpreted from pollen and diatom analysis of one sediment core from the littoral zone and another core from near the lake centre. The sequence of postglacial vegetation development parallels published accounts of forest history in northern Ontario. The predominant diatom throughout the littoral core was the alkaliphilous Cymbella diluviana. The central core was dominated by circumneutral and alkaliphilous species of Achnanthes Navicula, Fragilaria, and Cymbella, except in recent samples where acidophilous species of Anomoeoneis were common. Diatom-inferred (DI) pH shows that the early lake was alkaline because of drainage from base-rich tills. The presence of marl in the littoral core indicates deposition of calcareous materials until the site dried out during the Hypsithermal period. There is evidence that beaver activity around 5000 BP caused a temporary change in lake hydrology. A decline in DI pH over much of the postglacial reflects gradual exhaustion of carbonates in the drainage area. An increase in acidophilous diatoms in samples representing the past 3500 y is consistent with gradual acidification of the system and development of a littoral peatland in a cooler neoglacial climate.</abstract>
<relatedItem type="host"><titleInfo><title>Journal of Paleolimnology</title>
</titleInfo>
<titleInfo type="abbreviated"><title>J Paleolimnol</title>
</titleInfo>
<genre type="journal" displayLabel="Archive Journal"></genre>
<originInfo><dateIssued encoding="w3cdtf">1991-01-01</dateIssued>
<copyrightDate encoding="w3cdtf">1991</copyrightDate>
</originInfo>
<subject><genre>Life Sciences</genre>
<topic>Geochemistry</topic>
<topic>Hydrogeology</topic>
<topic>Meteorology/Climatology</topic>
<topic>Sedimentology</topic>
<topic>Hydrobiology</topic>
</subject>
<identifier type="ISSN">0921-2728</identifier>
<identifier type="eISSN">1573-0417</identifier>
<identifier type="JournalID">10933</identifier>
<identifier type="IssueArticleCount">9</identifier>
<identifier type="VolumeIssueCount">3</identifier>
<part><date>1991</date>
<detail type="volume"><number>6</number>
<caption>vol.</caption>
</detail>
<detail type="issue"><number>2</number>
<caption>no.</caption>
</detail>
<extent unit="pages"><start>141</start>
<end>155</end>
</extent>
</part>
<recordInfo><recordOrigin>Kluwer Academic Publishers, 1991</recordOrigin>
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<identifier type="istex">5C63EF66C375E5AD172ED5B9B093F9DF1D0A92A9</identifier>
<identifier type="DOI">10.1007/BF00153738</identifier>
<identifier type="ArticleID">BF00153738</identifier>
<identifier type="ArticleID">Art6</identifier>
<accessCondition type="use and reproduction" contentType="copyright">Kluwer Academic Publishers, 1991</accessCondition>
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