Small‐scale convection at a continental back‐arc to craton transition: Application to the southern Canadian Cordillera
Identifieur interne : 001366 ( Main/Exploration ); précédent : 001365; suivant : 001367Small‐scale convection at a continental back‐arc to craton transition: Application to the southern Canadian Cordillera
Auteurs : N. J. Hardebol [Pays-Bas] ; R. N. Pysklywec [Canada] ; R. Stephenson [Royaume-Uni]Source :
- Journal of Geophysical Research: Solid Earth [ 0148-0227 ] ; 2012-01.
Abstract
A step in the depth of the lithosphere base, associated with lateral variations in the upper mantle temperature structure, can trigger mantle flow that is referred to as edge‐driven convection. This paper aims at outlining the implications of such edge‐driven flow at a lateral temperature transition from a hot and thin to a cold and thick lithosphere of a continental back‐arc. This configuration finds application in the southern Canadian Cordillera, where a hot and thin back‐arc is adjacent to the cold and thick North American Craton. A series of geodynamical models tested the thermodynamical behavior of the lithosphere and upper mantle induced by a step in lithosphere thickness. The mantle flow patterns, thickness and heat flow evolution of the lithosphere, and surface topography are examined. We find that the lateral temperature transition shifts cratonward due to the vigorous edge‐driven mantle flow that erodes the craton edge, unless the craton has a distinct high viscosity mantle lithosphere. The mantle lithosphere viscosity structure determines the impact of edge‐driven flow on crustal deformation and surface heat flow; a dry olivine rheology for the craton prevents the edge from migrating and supports a persistent surface heat flow contrast. These phenomena are well illustrated at the transition from the hot Canadian Cordillera to craton that is supported by a rheological change and that coincides with a lateral change in surface heat flow. Fast seismic wave velocities observed in the upper mantle cratonward of the step can be explained as downwellings induced by the edge‐driven flow.
Url:
DOI: 10.1029/2011JB008431
Affiliations:
- Canada, Pays-Bas, Royaume-Uni
- Hollande-Septentrionale, Ontario
- Amsterdam, Toronto
- Université de Toronto
Links toward previous steps (curation, corpus...)
- to stream Istex, to step Corpus: 002734
- to stream Istex, to step Curation: 002734
- to stream Istex, to step Checkpoint: 000213
- to stream Main, to step Merge: 001398
- to stream Main, to step Curation: 001366
Le document en format XML
<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Small‐scale convection at a continental back‐arc to craton transition: Application to the southern Canadian Cordillera</title><author><name sortKey="Hardebol, N J" sort="Hardebol, N J" uniqKey="Hardebol N" first="N. J." last="Hardebol">N. J. Hardebol</name></author><author><name sortKey="Pysklywec, R N" sort="Pysklywec, R N" uniqKey="Pysklywec R" first="R. N." last="Pysklywec">R. N. Pysklywec</name></author><author><name sortKey="Stephenson, R" sort="Stephenson, R" uniqKey="Stephenson R" first="R." last="Stephenson">R. Stephenson</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:33CF7DA34B1B19C802AFD313C84DFFEDE0F23E8C</idno><date when="2012" year="2012">2012</date><idno type="doi">10.1029/2011JB008431</idno><idno type="url">https://api-v5.istex.fr/document/33CF7DA34B1B19C802AFD313C84DFFEDE0F23E8C/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">002734</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">002734</idno><idno type="wicri:Area/Istex/Curation">002734</idno><idno type="wicri:Area/Istex/Checkpoint">000213</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Checkpoint">000213</idno><idno type="wicri:doubleKey">0148-0227:2012:Hardebol N:small:scale:convection</idno><idno type="wicri:Area/Main/Merge">001398</idno><idno type="wicri:Area/Main/Curation">001366</idno><idno type="wicri:Area/Main/Exploration">001366</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Small‐scale convection at a continental back‐arc to craton transition: Application to the southern Canadian Cordillera</title><author><name sortKey="Hardebol, N J" sort="Hardebol, N J" uniqKey="Hardebol N" first="N. J." last="Hardebol">N. J. Hardebol</name><affiliation wicri:level="3"><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Formerly at Netherlands Research Centre for Integrated Solid Earth Sciences, Faculty of Earth and Life Science, VU University Amsterdam, Amsterdam</wicri:regionArea><placeName><settlement type="city">Amsterdam</settlement><region nuts="2" type="province">Hollande-Septentrionale</region></placeName></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Now at Department of Geotechnology, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft</wicri:regionArea><wicri:noRegion>Delft</wicri:noRegion></affiliation><affiliation wicri:level="1"><country wicri:rule="url">Pays-Bas</country></affiliation></author><author><name sortKey="Pysklywec, R N" sort="Pysklywec, R N" uniqKey="Pysklywec R" first="R. N." last="Pysklywec">R. N. Pysklywec</name><affiliation wicri:level="4"><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Geology, University of Toronto, Toronto, Ontario</wicri:regionArea><orgName type="university">Université de Toronto</orgName><placeName><settlement type="city">Toronto</settlement><region type="state">Ontario</region></placeName></affiliation></author><author><name sortKey="Stephenson, R" sort="Stephenson, R" uniqKey="Stephenson R" first="R." last="Stephenson">R. Stephenson</name><affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>School of Geosciences, University of Aberdeen, Aberdeen</wicri:regionArea><wicri:noRegion>Aberdeen</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Geophysical Research: Solid Earth</title><title level="j" type="abbrev">J. Geophys. Res.</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2012-01">2012-01</date><biblScope unit="volume">117</biblScope><biblScope unit="issue">B1</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">0148-0227</idno></series><idno type="istex">33CF7DA34B1B19C802AFD313C84DFFEDE0F23E8C</idno><idno type="DOI">10.1029/2011JB008431</idno><idno type="ArticleID">2011JB008431</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">A step in the depth of the lithosphere base, associated with lateral variations in the upper mantle temperature structure, can trigger mantle flow that is referred to as edge‐driven convection. This paper aims at outlining the implications of such edge‐driven flow at a lateral temperature transition from a hot and thin to a cold and thick lithosphere of a continental back‐arc. This configuration finds application in the southern Canadian Cordillera, where a hot and thin back‐arc is adjacent to the cold and thick North American Craton. A series of geodynamical models tested the thermodynamical behavior of the lithosphere and upper mantle induced by a step in lithosphere thickness. The mantle flow patterns, thickness and heat flow evolution of the lithosphere, and surface topography are examined. We find that the lateral temperature transition shifts cratonward due to the vigorous edge‐driven mantle flow that erodes the craton edge, unless the craton has a distinct high viscosity mantle lithosphere. The mantle lithosphere viscosity structure determines the impact of edge‐driven flow on crustal deformation and surface heat flow; a dry olivine rheology for the craton prevents the edge from migrating and supports a persistent surface heat flow contrast. These phenomena are well illustrated at the transition from the hot Canadian Cordillera to craton that is supported by a rheological change and that coincides with a lateral change in surface heat flow. Fast seismic wave velocities observed in the upper mantle cratonward of the step can be explained as downwellings induced by the edge‐driven flow.</div></front></TEI><affiliations><list><country><li>Canada</li><li>Pays-Bas</li><li>Royaume-Uni</li></country><region><li>Hollande-Septentrionale</li><li>Ontario</li></region><settlement><li>Amsterdam</li><li>Toronto</li></settlement><orgName><li>Université de Toronto</li></orgName></list><tree><country name="Pays-Bas"><region name="Hollande-Septentrionale"><name sortKey="Hardebol, N J" sort="Hardebol, N J" uniqKey="Hardebol N" first="N. J." last="Hardebol">N. J. Hardebol</name></region><name sortKey="Hardebol, N J" sort="Hardebol, N J" uniqKey="Hardebol N" first="N. J." last="Hardebol">N. J. Hardebol</name><name sortKey="Hardebol, N J" sort="Hardebol, N J" uniqKey="Hardebol N" first="N. J." last="Hardebol">N. J. Hardebol</name></country><country name="Canada"><region name="Ontario"><name sortKey="Pysklywec, R N" sort="Pysklywec, R N" uniqKey="Pysklywec R" first="R. N." last="Pysklywec">R. N. Pysklywec</name></region></country><country name="Royaume-Uni"><noRegion><name sortKey="Stephenson, R" sort="Stephenson, R" uniqKey="Stephenson R" first="R." last="Stephenson">R. Stephenson</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/Canada/explor/ParkinsonCanadaV1/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 001366 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd -nk 001366 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien
|wiki= Wicri/Canada
|area= ParkinsonCanadaV1
|flux= Main
|étape= Exploration
|type= RBID
|clé= ISTEX:33CF7DA34B1B19C802AFD313C84DFFEDE0F23E8C
|texte= Small‐scale convection at a continental back‐arc to craton transition: Application to the southern Canadian Cordillera
}}
| This area was generated with Dilib version V0.6.29. |  |