Magnetotelluric soundings in the Canadian Rocky Mountains
Identifieur interne : 001411 ( Istex/Corpus ); précédent : 001410; suivant : 001412Magnetotelluric soundings in the Canadian Rocky Mountains
Auteurs : V. R. S. Hutton ; D. I. Gough ; G. J. K. Dawes ; J. TravassosSource :
- Geophysical Journal International [ 0956-540X ] ; 1987-07.
Abstract
Magnetotelluric soundings have been made at 25 stations in the Rocky Mountain Trench (RMT) and Main Ranges near 53° N, close to the centre of a major conductivity anomaly which had been mapped in a magnetovariation array study. Most stations covered the frequency range 0.01–500 Hz and three stations 0.0002–500 Hz. the resistivity tensor shows low to moderate anisotropy in the RMT, but is strongly 2-D or 3-D in the Rocky Mountains. Apparent resistivities as a function of frequency are displayed in pseudosections along the Trench and along a transverse profile across the RMT and into the Main Ranges. In preparation for 2-D modelling, 1-D inversions have been used to construct resistivity-depth sections satisfying both magnitudes and phases of the MT responses. These show very low resistivities, in the range 1—10Ωm, in the upper crust under the RMT and even lower values under the Main Ranges. the latter values give strong confirmation of the Northern Rockies conductor reported by Bingham, Cough & Ingham and are in agreement with models of the conductors fitted to long-period magnetovariation fields by Ingham, Gough & Parkinson. the MT results here reported add some essential depth and resistivity information. It is suggested that the conductors beneath the Rocky Mountains Main Ranges and Trench constitute a thickening at the edge of the Canadian Cordilleran Regional (CCR) conductor. Gough has argued that a wide variety of geophysical and geological parameters indicate high temperatures and partial melting in the mantle under the CCR conductor. At the upper crustal depths penetrated in this magnetotelluric study, it is considered more probable that the high conductivity is caused by hot, saline water of mantle origin rather than silicate melt. the CCR in general may have two layers of fluid producing its high conductivity, silicate melt below and saline hot water above.
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DOI: 10.1111/j.1365-246X.1987.tb00683.x
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Hutton</name><affiliation><mods:affiliation>Department of Geophysics, University of Edinburgh, May field Road, Edinburgh EH93JZ, Scotland.</mods:affiliation></affiliation></author><author><name sortKey="Gough, D I" sort="Gough, D I" uniqKey="Gough D" first="D. I." last="Gough">D. I. Gough</name><affiliation><mods:affiliation>Department of Physics, University of Alberta, Edmonton, Alberta T6G2J1, Canada.</mods:affiliation></affiliation></author><author><name sortKey="Dawes, G J K" sort="Dawes, G J K" uniqKey="Dawes G" first="G. J. K." last="Dawes">G. J. K. Dawes</name><affiliation><mods:affiliation>Department of Geophysics, University of Edinburgh, May field Road, Edinburgh EH93JZ, Scotland.</mods:affiliation></affiliation></author><author><name sortKey="Travassos, J" sort="Travassos, J" uniqKey="Travassos J" first="J." last="Travassos">J. Travassos</name><affiliation><mods:affiliation>Department of Geophysics, University of Edinburgh, May field Road, Edinburgh EH93JZ, Scotland.</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Geophysical Journal International</title><title level="j" type="abbrev">Geophys. J. Int.</title><idno type="ISSN">0956-540X</idno><idno type="eISSN">1365-246X</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="1987-07">1987-07</date><biblScope unit="volume">90</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="245">245</biblScope><biblScope unit="page" to="263">263</biblScope></imprint><idno type="ISSN">0956-540X</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0956-540X</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract">Magnetotelluric soundings have been made at 25 stations in the Rocky Mountain Trench (RMT) and Main Ranges near 53° N, close to the centre of a major conductivity anomaly which had been mapped in a magnetovariation array study. Most stations covered the frequency range 0.01–500 Hz and three stations 0.0002–500 Hz. the resistivity tensor shows low to moderate anisotropy in the RMT, but is strongly 2-D or 3-D in the Rocky Mountains. Apparent resistivities as a function of frequency are displayed in pseudosections along the Trench and along a transverse profile across the RMT and into the Main Ranges. In preparation for 2-D modelling, 1-D inversions have been used to construct resistivity-depth sections satisfying both magnitudes and phases of the MT responses. These show very low resistivities, in the range 1—10Ωm, in the upper crust under the RMT and even lower values under the Main Ranges. the latter values give strong confirmation of the Northern Rockies conductor reported by Bingham, Cough & Ingham and are in agreement with models of the conductors fitted to long-period magnetovariation fields by Ingham, Gough & Parkinson. the MT results here reported add some essential depth and resistivity information. It is suggested that the conductors beneath the Rocky Mountains Main Ranges and Trench constitute a thickening at the edge of the Canadian Cordilleran Regional (CCR) conductor. Gough has argued that a wide variety of geophysical and geological parameters indicate high temperatures and partial melting in the mantle under the CCR conductor. At the upper crustal depths penetrated in this magnetotelluric study, it is considered more probable that the high conductivity is caused by hot, saline water of mantle origin rather than silicate melt. the CCR in general may have two layers of fluid producing its high conductivity, silicate melt below and saline hot water above.</div></front></TEI><istex><corpusName>oup</corpusName><author><json:item><name>V. R. S. Hutton</name><affiliations><json:string>Department of Geophysics, University of Edinburgh, May field Road, Edinburgh EH93JZ, Scotland.</json:string></affiliations></json:item><json:item><name>D. I. Gough</name><affiliations><json:string>Department of Physics, University of Alberta, Edmonton, Alberta T6G2J1, Canada.</json:string></affiliations></json:item><json:item><name>G. J. K. Dawes</name><affiliations><json:string>Department of Geophysics, University of Edinburgh, May field Road, Edinburgh EH93JZ, Scotland.</json:string></affiliations></json:item><json:item><name>J. Travassos</name><affiliations><json:string>Department of Geophysics, University of Edinburgh, May field Road, Edinburgh EH93JZ, Scotland.</json:string></affiliations></json:item></author><subject><json:item><value>amgnetotellurics</value></json:item><json:item><value>Canada</value></json:item><json:item><value>Rocky Mountains</value></json:item><json:item><value>geothermal</value></json:item></subject><language><json:string>unknown</json:string></language><originalGenre><json:string>research-article</json:string></originalGenre><abstract>Magnetotelluric soundings have been made at 25 stations in the Rocky Mountain Trench (RMT) and Main Ranges near 53° N, close to the centre of a major conductivity anomaly which had been mapped in a magnetovariation array study. Most stations covered the frequency range 0.01–500 Hz and three stations 0.0002–500 Hz. the resistivity tensor shows low to moderate anisotropy in the RMT, but is strongly 2-D or 3-D in the Rocky Mountains. Apparent resistivities as a function of frequency are displayed in pseudosections along the Trench and along a transverse profile across the RMT and into the Main Ranges. In preparation for 2-D modelling, 1-D inversions have been used to construct resistivity-depth sections satisfying both magnitudes and phases of the MT responses. These show very low resistivities, in the range 1—10Ωm, in the upper crust under the RMT and even lower values under the Main Ranges. the latter values give strong confirmation of the Northern Rockies conductor reported by Bingham, Cough & Ingham and are in agreement with models of the conductors fitted to long-period magnetovariation fields by Ingham, Gough & Parkinson. the MT results here reported add some essential depth and resistivity information. It is suggested that the conductors beneath the Rocky Mountains Main Ranges and Trench constitute a thickening at the edge of the Canadian Cordilleran Regional (CCR) conductor. Gough has argued that a wide variety of geophysical and geological parameters indicate high temperatures and partial melting in the mantle under the CCR conductor. At the upper crustal depths penetrated in this magnetotelluric study, it is considered more probable that the high conductivity is caused by hot, saline water of mantle origin rather than silicate melt. the CCR in general may have two layers of fluid producing its high conductivity, silicate melt below and saline hot water above.</abstract><qualityIndicators><score>10</score><pdfWordCount>7137</pdfWordCount><pdfCharCount>40736</pdfCharCount><pdfVersion>1.4</pdfVersion><pdfPageCount>19</pdfPageCount><pdfPageSize>540 x 791.759 pts</pdfPageSize><refBibsNative>true</refBibsNative><abstractWordCount>300</abstractWordCount><abstractCharCount>1898</abstractCharCount><keywordCount>4</keywordCount></qualityIndicators><title>Magnetotelluric soundings in the Canadian Rocky Mountains</title><genre><json:string>research-article</json:string></genre><host><title>Geophysical Journal International</title><language><json:string>unknown</json:string></language><issn><json:string>0956-540X</json:string></issn><eissn><json:string>1365-246X</json:string></eissn><publisherId><json:string>gji</json:string></publisherId><volume>90</volume><issue>1</issue><pages><first>245</first><last>263</last></pages><genre><json:string>journal</json:string></genre></host><categories><wos><json:string>science</json:string><json:string>geochemistry & geophysics</json:string></wos><scienceMetrix><json:string>natural sciences</json:string><json:string>earth & environmental sciences</json:string><json:string>geochemistry & geophysics</json:string></scienceMetrix></categories><publicationDate>1987</publicationDate><copyrightDate>1987</copyrightDate><doi><json:string>10.1111/j.1365-246X.1987.tb00683.x</json:string></doi><id>FC1F065E5E5951A709B579E41AF56E2BA5C79B3F</id><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api-v5.istex.fr/document/FC1F065E5E5951A709B579E41AF56E2BA5C79B3F/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api-v5.istex.fr/document/FC1F065E5E5951A709B579E41AF56E2BA5C79B3F/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api-v5.istex.fr/document/FC1F065E5E5951A709B579E41AF56E2BA5C79B3F/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a">Magnetotelluric soundings in the Canadian Rocky Mountains</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><availability><p>OUP</p></availability><date>1987</date></publicationStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a">Magnetotelluric soundings in the Canadian Rocky Mountains</title><author xml:id="author-0000"><persName><forename type="first">V. R. S.</forename><surname>Hutton</surname></persName><affiliation>Department of Geophysics, University of Edinburgh, May field Road, Edinburgh EH93JZ, Scotland.</affiliation></author><author xml:id="author-0001"><persName><forename type="first">D. I.</forename><surname>Gough</surname></persName><affiliation>Department of Physics, University of Alberta, Edmonton, Alberta T6G2J1, Canada.</affiliation></author><author xml:id="author-0002"><persName><forename type="first">G. J. K.</forename><surname>Dawes</surname></persName><affiliation>Department of Geophysics, University of Edinburgh, May field Road, Edinburgh EH93JZ, Scotland.</affiliation></author><author xml:id="author-0003"><persName><forename type="first">J.</forename><surname>Travassos</surname></persName><affiliation>Department of Geophysics, University of Edinburgh, May field Road, Edinburgh EH93JZ, Scotland.</affiliation></author><idno type="istex">FC1F065E5E5951A709B579E41AF56E2BA5C79B3F</idno><idno type="DOI">10.1111/j.1365-246X.1987.tb00683.x</idno></analytic><monogr><title level="j">Geophysical Journal International</title><title level="j" type="abbrev">Geophys. J. Int.</title><idno type="pISSN">0956-540X</idno><idno type="eISSN">1365-246X</idno><idno type="PublisherID">gji</idno><idno type="PublisherID-hwp">gji</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="1987-07"></date><biblScope unit="volume">90</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="245">245</biblScope><biblScope unit="page" to="263">263</biblScope></imprint></monogr></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1987</date></creation><abstract><p>Magnetotelluric soundings have been made at 25 stations in the Rocky Mountain Trench (RMT) and Main Ranges near 53° N, close to the centre of a major conductivity anomaly which had been mapped in a magnetovariation array study. Most stations covered the frequency range 0.01–500 Hz and three stations 0.0002–500 Hz. the resistivity tensor shows low to moderate anisotropy in the RMT, but is strongly 2-D or 3-D in the Rocky Mountains. Apparent resistivities as a function of frequency are displayed in pseudosections along the Trench and along a transverse profile across the RMT and into the Main Ranges. In preparation for 2-D modelling, 1-D inversions have been used to construct resistivity-depth sections satisfying both magnitudes and phases of the MT responses. These show very low resistivities, in the range 1—10Ωm, in the upper crust under the RMT and even lower values under the Main Ranges. the latter values give strong confirmation of the Northern Rockies conductor reported by Bingham, Cough & Ingham and are in agreement with models of the conductors fitted to long-period magnetovariation fields by Ingham, Gough & Parkinson. the MT results here reported add some essential depth and resistivity information. It is suggested that the conductors beneath the Rocky Mountains Main Ranges and Trench constitute a thickening at the edge of the Canadian Cordilleran Regional (CCR) conductor. Gough has argued that a wide variety of geophysical and geological parameters indicate high temperatures and partial melting in the mantle under the CCR conductor. At the upper crustal depths penetrated in this magnetotelluric study, it is considered more probable that the high conductivity is caused by hot, saline water of mantle origin rather than silicate melt. the CCR in general may have two layers of fluid producing its high conductivity, silicate melt below and saline hot water above.</p></abstract><textClass><keywords scheme="keyword"><list><head>Keywords</head><item><term>amgnetotellurics</term></item><item><term>Canada</term></item><item><term>Rocky Mountains</term></item><item><term>geothermal</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="1987-07">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api-v5.istex.fr/document/FC1F065E5E5951A709B579E41AF56E2BA5C79B3F/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="corpus oup" wicri:toSee="no header"><istex:xmlDeclaration>version="1.0"</istex:xmlDeclaration><istex:docType PUBLIC="-//NLM//DTD Journal Publishing DTD v2.3 20070202//EN" URI="journalpublishing.dtd" name="istex:docType"></istex:docType><istex:document><article article-type="research-article"><front><journal-meta><journal-id journal-id-type="hwp">gji</journal-id><journal-id journal-id-type="publisher-id">gji</journal-id><journal-title>Geophysical Journal International</journal-title><abbrev-journal-title>Geophys. J. Int.</abbrev-journal-title><issn pub-type="ppub">0956-540X</issn><issn pub-type="epub">1365-246X</issn><publisher><publisher-name>Blackwell Publishing Ltd</publisher-name><publisher-loc>Oxford, UK</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.1111/j.1365-246X.1987.tb00683.x</article-id><article-categories><subj-group subj-group-type="heading"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>Magnetotelluric soundings in the Canadian Rocky Mountains</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Hutton</surname><given-names>V. R. S.</given-names></name><xref ref-type="aff" rid="aff1"><sup>⋆</sup></xref></contrib><contrib contrib-type="author"><name><surname>Gough</surname><given-names>D. I.</given-names></name><xref ref-type="aff" rid="aff2"><sup>†</sup></xref></contrib><contrib contrib-type="author"><name><surname>Dawes</surname><given-names>G. J. K.</given-names></name><xref ref-type="aff" rid="aff1"><sup>⋆</sup></xref></contrib><contrib contrib-type="author"><name><surname>Travassos</surname><given-names>J.</given-names></name><xref ref-type="aff" rid="aff1"><sup>⋆</sup></xref></contrib><aff id="aff1"><label>⋆</label>Department of Geophysics, University of Edinburgh, May field Road, Edinburgh EH93JZ, Scotland.</aff><aff id="aff2"><label>†</label>Department of Physics, University of Alberta, Edmonton, Alberta T6G2J1, Canada.</aff></contrib-group><pub-date pub-type="ppub"><month>7</month><year>1987</year></pub-date><volume>90</volume><issue>1</issue><fpage>245</fpage><lpage>263</lpage><history><date date-type="received"><day>24</day><month>11</month><year>1986</year></date><date date-type="accepted"><day>8</day><month>12</month><year>1986</year></date></history><permissions><copyright-year>1987</copyright-year></permissions><abstract><title>Summary</title><p>Magnetotelluric soundings have been made at 25 stations in the Rocky Mountain Trench (RMT) and Main Ranges near 53° N, close to the centre of a major conductivity anomaly which had been mapped in a magnetovariation array study. Most stations covered the frequency range 0.01–500 Hz and three stations 0.0002–500 Hz. the resistivity tensor shows low to moderate anisotropy in the RMT, but is strongly 2-D or 3-D in the Rocky Mountains. Apparent resistivities as a function of frequency are displayed in pseudosections along the Trench and along a transverse profile across the RMT and into the Main Ranges. In preparation for 2-D modelling, 1-D inversions have been used to construct resistivity-depth sections satisfying both magnitudes and phases of the MT responses. These show very low resistivities, in the range 1—10Ωm, in the upper crust under the RMT and even lower values under the Main Ranges. the latter values give strong confirmation of the Northern Rockies conductor reported by Bingham, Cough & Ingham and are in agreement with models of the conductors fitted to long-period magnetovariation fields by Ingham, Gough & Parkinson. the MT results here reported add some essential depth and resistivity information. It is suggested that the conductors beneath the Rocky Mountains Main Ranges and Trench constitute a thickening at the edge of the Canadian Cordilleran Regional (CCR) conductor. Gough has argued that a wide variety of geophysical and geological parameters indicate high temperatures and partial melting in the mantle under the CCR conductor. At the upper crustal depths penetrated in this magnetotelluric study, it is considered more probable that the high conductivity is caused by hot, saline water of mantle origin rather than silicate melt. the CCR in general may have two layers of fluid producing its high conductivity, silicate melt below and saline hot water above.</p></abstract><kwd-group><title>Keywords</title><kwd>amgnetotellurics</kwd><kwd>Canada</kwd><kwd>Rocky Mountains</kwd><kwd>geothermal</kwd></kwd-group></article-meta></front></article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>Magnetotelluric soundings in the Canadian Rocky Mountains</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>Magnetotelluric soundings in the Canadian Rocky Mountains</title></titleInfo><name type="personal"><namePart type="given">V. R. S.</namePart><namePart type="family">Hutton</namePart><affiliation>Department of Geophysics, University of Edinburgh, May field Road, Edinburgh EH93JZ, Scotland.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">D. I.</namePart><namePart type="family">Gough</namePart><affiliation>Department of Physics, University of Alberta, Edmonton, Alberta T6G2J1, Canada.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">G. J. K.</namePart><namePart type="family">Dawes</namePart><affiliation>Department of Geophysics, University of Edinburgh, May field Road, Edinburgh EH93JZ, Scotland.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J.</namePart><namePart type="family">Travassos</namePart><affiliation>Department of Geophysics, University of Edinburgh, May field Road, Edinburgh EH93JZ, Scotland.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="research-article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><place><placeTerm type="text">Oxford, UK</placeTerm></place><dateIssued encoding="w3cdtf">1987-07</dateIssued><copyrightDate encoding="w3cdtf">1987</copyrightDate></originInfo><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract>Magnetotelluric soundings have been made at 25 stations in the Rocky Mountain Trench (RMT) and Main Ranges near 53° N, close to the centre of a major conductivity anomaly which had been mapped in a magnetovariation array study. Most stations covered the frequency range 0.01–500 Hz and three stations 0.0002–500 Hz. the resistivity tensor shows low to moderate anisotropy in the RMT, but is strongly 2-D or 3-D in the Rocky Mountains. Apparent resistivities as a function of frequency are displayed in pseudosections along the Trench and along a transverse profile across the RMT and into the Main Ranges. In preparation for 2-D modelling, 1-D inversions have been used to construct resistivity-depth sections satisfying both magnitudes and phases of the MT responses. These show very low resistivities, in the range 1—10Ωm, in the upper crust under the RMT and even lower values under the Main Ranges. the latter values give strong confirmation of the Northern Rockies conductor reported by Bingham, Cough & Ingham and are in agreement with models of the conductors fitted to long-period magnetovariation fields by Ingham, Gough & Parkinson. the MT results here reported add some essential depth and resistivity information. It is suggested that the conductors beneath the Rocky Mountains Main Ranges and Trench constitute a thickening at the edge of the Canadian Cordilleran Regional (CCR) conductor. Gough has argued that a wide variety of geophysical and geological parameters indicate high temperatures and partial melting in the mantle under the CCR conductor. At the upper crustal depths penetrated in this magnetotelluric study, it is considered more probable that the high conductivity is caused by hot, saline water of mantle origin rather than silicate melt. the CCR in general may have two layers of fluid producing its high conductivity, silicate melt below and saline hot water above.</abstract><subject><genre>Keywords</genre><topic>amgnetotellurics</topic><topic>Canada</topic><topic>Rocky Mountains</topic><topic>geothermal</topic></subject><relatedItem type="host"><titleInfo><title>Geophysical Journal International</title></titleInfo><titleInfo type="abbreviated"><title>Geophys. J. Int.</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">0956-540X</identifier><identifier type="eISSN">1365-246X</identifier><identifier type="PublisherID">gji</identifier><identifier type="PublisherID-hwp">gji</identifier><part><date>1987</date><detail type="volume"><caption>vol.</caption><number>90</number></detail><detail type="issue"><caption>no.</caption><number>1</number></detail><extent unit="pages"><start>245</start><end>263</end></extent></part></relatedItem><identifier type="istex">FC1F065E5E5951A709B579E41AF56E2BA5C79B3F</identifier><identifier type="DOI">10.1111/j.1365-246X.1987.tb00683.x</identifier><recordInfo><recordContentSource>OUP</recordContentSource></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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