The dammed Hikurangi Trough: a channel‐fed trench blocked by subducting seamounts and their wake avalanches (New Zealand–France GeodyNZ Project)
Identifieur interne : 001D66 ( Istex/Corpus ); précédent : 001D65; suivant : 001D67The dammed Hikurangi Trough: a channel‐fed trench blocked by subducting seamounts and their wake avalanches (New Zealand–France GeodyNZ Project)
Auteurs : Keith B. Lewis ; Jean-Yves Collot ; Serge E. LallemSource :
- Basin Research [ 0950-091X ] ; 1998-12.
Abstract
The Hikurangi Trough, off eastern New Zealand, is at the southern end of the Tonga–Kermadec–Hikurangi subduction system, which merges into a zone of intracontinental transform. The trough is mainly a turbidite‐filled structural trench but includes an oblique‐collision, foredeep basin. Its northern end has a sharp boundary with the deep, sediment‐starved, Kermadec Trench. Swath‐mapping, sampling and seismic surveys show modern sediment input is mainly via Kaikoura Canyon, which intercepts littoral drift at the southern, intracontinental apex of the trough, with minor input from seep gullies. Glacial age input was via many canyons and about an order of magnitude greater. Beyond a narrow, gravelly, intracontinental foredeep, the southern trench‐basin is characterized by a channel meandering around the seaward edge of mainly Plio‐Pleistocene, overbank deposits that reach 5 km in thickness. The aggrading channel has sandy turbidites, but low‐backscatter, and long‐wavelength bedforms indicating thick flows. Levées on both sides are capped by tangentially aligned mudwaves on the outsides of bends, indicating centrifugal overflow from heads of dense, fast‐moving, autosuspension flows. The higher, left‐bank levée also has levée‐parallel mudwaves, indicating Coriolis and/or boundary currents effects on dilute flows or tail plumes. In the northern trough, basin‐fill is generally less than 2 km thick and includes widespread overbank turbidites, a massive, blocky, avalanche deposit and an extensive, buried, debris flow deposit. A line of low seamounts on the subducting plate acts as a dam preventing modern turbidity currents from reaching the Kermadec Trench. Major margin collapse probably occurred in the wake of a large subducting seamount; this seamount and its wake debris flow probably dammed the trench from 2 Ma to 0.5 Ma. Before this, similar dams may have re‐routed turbidity currents across the plateau.
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DOI: 10.1046/j.1365-2117.1998.00080.x
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Lewis</name><affiliation><mods:affiliation>NIWA, PO Box 14901, Wellington, New Zealand</mods:affiliation></affiliation></author><author><name sortKey="Collot, Jean Ves" sort="Collot, Jean Ves" uniqKey="Collot J" first="Jean-Yves" last="Collot">Jean-Yves Collot</name><affiliation><mods:affiliation>ORSTOM, Villefranche sur mer, France</mods:affiliation></affiliation></author><author><name sortKey="Lallem, Serge E" sort="Lallem, Serge E" uniqKey="Lallem S" first="Serge E." last="Lallem">Serge E. Lallem</name><affiliation><mods:affiliation>Université de Montpellier II, Montpellier, France</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Basin Research</title><idno type="ISSN">0950-091X</idno><idno type="eISSN">1365-2117</idno><imprint><publisher>Blackwell Science Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="1998-12">1998-12</date><biblScope unit="volume">10</biblScope><biblScope unit="issue">4</biblScope><biblScope unit="page" from="441">441</biblScope><biblScope unit="page" to="468">468</biblScope></imprint><idno type="ISSN">0950-091X</idno></series><idno type="istex">E5D0EDDDF2E8EBDB67A82CDAD88F5095A8DA0E23</idno><idno type="DOI">10.1046/j.1365-2117.1998.00080.x</idno><idno type="ArticleID">BRE080</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0950-091X</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The Hikurangi Trough, off eastern New Zealand, is at the southern end of the Tonga–Kermadec–Hikurangi subduction system, which merges into a zone of intracontinental transform. The trough is mainly a turbidite‐filled structural trench but includes an oblique‐collision, foredeep basin. Its northern end has a sharp boundary with the deep, sediment‐starved, Kermadec Trench. Swath‐mapping, sampling and seismic surveys show modern sediment input is mainly via Kaikoura Canyon, which intercepts littoral drift at the southern, intracontinental apex of the trough, with minor input from seep gullies. Glacial age input was via many canyons and about an order of magnitude greater. Beyond a narrow, gravelly, intracontinental foredeep, the southern trench‐basin is characterized by a channel meandering around the seaward edge of mainly Plio‐Pleistocene, overbank deposits that reach 5 km in thickness. The aggrading channel has sandy turbidites, but low‐backscatter, and long‐wavelength bedforms indicating thick flows. Levées on both sides are capped by tangentially aligned mudwaves on the outsides of bends, indicating centrifugal overflow from heads of dense, fast‐moving, autosuspension flows. The higher, left‐bank levée also has levée‐parallel mudwaves, indicating Coriolis and/or boundary currents effects on dilute flows or tail plumes. In the northern trough, basin‐fill is generally less than 2 km thick and includes widespread overbank turbidites, a massive, blocky, avalanche deposit and an extensive, buried, debris flow deposit. A line of low seamounts on the subducting plate acts as a dam preventing modern turbidity currents from reaching the Kermadec Trench. Major margin collapse probably occurred in the wake of a large subducting seamount; this seamount and its wake debris flow probably dammed the trench from 2 Ma to 0.5 Ma. Before this, similar dams may have re‐routed turbidity currents across the plateau.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Keith B. Lewis</name><affiliations><json:string>NIWA, PO Box 14901, Wellington, New Zealand</json:string></affiliations></json:item><json:item><name>Jean‐Yves Collot</name><affiliations><json:string>ORSTOM, Villefranche sur mer, France</json:string></affiliations></json:item><json:item><name>Serge E. Lallem</name><affiliations><json:string>Université de Montpellier II, Montpellier, France</json:string></affiliations></json:item></author><articleId><json:string>BRE080</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><abstract>The Hikurangi Trough, off eastern New Zealand, is at the southern end of the Tonga–Kermadec–Hikurangi subduction system, which merges into a zone of intracontinental transform. The trough is mainly a turbidite‐filled structural trench but includes an oblique‐collision, foredeep basin. Its northern end has a sharp boundary with the deep, sediment‐starved, Kermadec Trench. Swath‐mapping, sampling and seismic surveys show modern sediment input is mainly via Kaikoura Canyon, which intercepts littoral drift at the southern, intracontinental apex of the trough, with minor input from seep gullies. Glacial age input was via many canyons and about an order of magnitude greater. Beyond a narrow, gravelly, intracontinental foredeep, the southern trench‐basin is characterized by a channel meandering around the seaward edge of mainly Plio‐Pleistocene, overbank deposits that reach 5 km in thickness. The aggrading channel has sandy turbidites, but low‐backscatter, and long‐wavelength bedforms indicating thick flows. Levées on both sides are capped by tangentially aligned mudwaves on the outsides of bends, indicating centrifugal overflow from heads of dense, fast‐moving, autosuspension flows. The higher, left‐bank levée also has levée‐parallel mudwaves, indicating Coriolis and/or boundary currents effects on dilute flows or tail plumes. In the northern trough, basin‐fill is generally less than 2 km thick and includes widespread overbank turbidites, a massive, blocky, avalanche deposit and an extensive, buried, debris flow deposit. A line of low seamounts on the subducting plate acts as a dam preventing modern turbidity currents from reaching the Kermadec Trench. Major margin collapse probably occurred in the wake of a large subducting seamount; this seamount and its wake debris flow probably dammed the trench from 2 Ma to 0.5 Ma. Before this, similar dams may have re‐routed turbidity currents across the plateau.</abstract><qualityIndicators><score>8</score><pdfVersion>1.2</pdfVersion><pdfPageSize>596 x 842 pts (A4)</pdfPageSize><refBibsNative>false</refBibsNative><abstractCharCount>1929</abstractCharCount><pdfWordCount>15770</pdfWordCount><pdfCharCount>94312</pdfCharCount><pdfPageCount>28</pdfPageCount><abstractWordCount>276</abstractWordCount></qualityIndicators><title>The dammed Hikurangi Trough: a channel‐fed trench blocked by subducting seamounts and their wake avalanches (New Zealand–France GeodyNZ Project)</title><refBibs><json:item><host><author></author><title>Hikurangi subduction plate boundary</title></host></json:item><json:item><host><author><json:item><name>D M</name></json:item><json:item><name>C G</name></json:item><json:item><name>R,G </name></json:item><json:item><name>A </name></json:item><json:item><name>D,F S</name></json:item><json:item><name>S </name></json:item></author><publicationDate>1990</publicationDate></host></json:item><json:item><author></author><host><volume>29</volume><pages><last>497</last><first>475</first></pages><author></author><title>Sedimentology</title></host></json:item><json:item><author></author><host><volume>101</volume><pages><last>478</last><first>425</first></pages><author></author><title>Geophys. 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Rec</title><publicationDate>1991</publicationDate></host><title>An evaluation of seismic hazard in the Kaikoura region, southeastern Marlborough</title><publicationDate>1991</publicationDate></json:item><json:item><host><author><json:item><name>September Received 15</name></json:item></author><publicationDate>1997-09</publicationDate></host></json:item></refBibs><genre><json:string>article</json:string></genre><host><volume>10</volume><publisherId><json:string>BRE</json:string></publisherId><pages><total>28</total><last>468</last><first>441</first></pages><issn><json:string>0950-091X</json:string></issn><issue>4</issue><genre><json:string>journal</json:string></genre><language><json:string>unknown</json:string></language><eissn><json:string>1365-2117</json:string></eissn><title>Basin Research</title><doi><json:string>10.1111/(ISSN)1365-2117</json:string></doi></host><categories><wos><json:string>science</json:string><json:string>geosciences, multidisciplinary</json:string></wos><scienceMetrix><json:string>natural sciences</json:string><json:string>earth & environmental sciences</json:string><json:string>geology</json:string></scienceMetrix></categories><publicationDate>1998</publicationDate><copyrightDate>1998</copyrightDate><doi><json:string>10.1046/j.1365-2117.1998.00080.x</json:string></doi><id>E5D0EDDDF2E8EBDB67A82CDAD88F5095A8DA0E23</id><score>0.991119</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/E5D0EDDDF2E8EBDB67A82CDAD88F5095A8DA0E23/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/E5D0EDDDF2E8EBDB67A82CDAD88F5095A8DA0E23/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/E5D0EDDDF2E8EBDB67A82CDAD88F5095A8DA0E23/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">The dammed Hikurangi Trough: a channel‐fed trench blocked by subducting seamounts and their wake avalanches (New Zealand–France GeodyNZ Project)</title><respStmt><resp>Références bibliographiques récupérées via GROBID</resp><name resp="ISTEX-API">ISTEX-API (INIST-CNRS)</name></respStmt><respStmt><resp>Références bibliographiques récupérées via GROBID</resp><name resp="ISTEX-API">ISTEX-API (INIST-CNRS)</name></respStmt></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>Blackwell Science Ltd</publisher><pubPlace>Oxford, UK</pubPlace><availability><p>WILEY</p></availability><date>1998</date></publicationStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">The dammed Hikurangi Trough: a channel‐fed trench blocked by subducting seamounts and their wake avalanches (New Zealand–France GeodyNZ Project)</title><author xml:id="author-1"><persName><forename type="first">Keith B.</forename><surname>Lewis</surname></persName><affiliation>NIWA, PO Box 14901, Wellington, New Zealand</affiliation></author><author xml:id="author-2"><persName><forename type="first">Jean‐Yves</forename><surname>Collot</surname></persName><affiliation>ORSTOM, Villefranche sur mer, France</affiliation></author><author xml:id="author-3"><persName><forename type="first">Serge E.</forename><surname>Lallem</surname></persName><affiliation>Université de Montpellier II, Montpellier, France</affiliation></author></analytic><monogr><title level="j">Basin Research</title><idno type="pISSN">0950-091X</idno><idno type="eISSN">1365-2117</idno><idno type="DOI">10.1111/(ISSN)1365-2117</idno><imprint><publisher>Blackwell Science Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="1998-12"></date><biblScope unit="volume">10</biblScope><biblScope unit="issue">4</biblScope><biblScope unit="page" from="441">441</biblScope><biblScope unit="page" to="468">468</biblScope></imprint></monogr><idno type="istex">E5D0EDDDF2E8EBDB67A82CDAD88F5095A8DA0E23</idno><idno type="DOI">10.1046/j.1365-2117.1998.00080.x</idno><idno type="ArticleID">BRE080</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1998</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>The Hikurangi Trough, off eastern New Zealand, is at the southern end of the Tonga–Kermadec–Hikurangi subduction system, which merges into a zone of intracontinental transform. The trough is mainly a turbidite‐filled structural trench but includes an oblique‐collision, foredeep basin. Its northern end has a sharp boundary with the deep, sediment‐starved, Kermadec Trench. Swath‐mapping, sampling and seismic surveys show modern sediment input is mainly via Kaikoura Canyon, which intercepts littoral drift at the southern, intracontinental apex of the trough, with minor input from seep gullies. Glacial age input was via many canyons and about an order of magnitude greater. Beyond a narrow, gravelly, intracontinental foredeep, the southern trench‐basin is characterized by a channel meandering around the seaward edge of mainly Plio‐Pleistocene, overbank deposits that reach 5 km in thickness. The aggrading channel has sandy turbidites, but low‐backscatter, and long‐wavelength bedforms indicating thick flows. Levées on both sides are capped by tangentially aligned mudwaves on the outsides of bends, indicating centrifugal overflow from heads of dense, fast‐moving, autosuspension flows. The higher, left‐bank levée also has levée‐parallel mudwaves, indicating Coriolis and/or boundary currents effects on dilute flows or tail plumes. In the northern trough, basin‐fill is generally less than 2 km thick and includes widespread overbank turbidites, a massive, blocky, avalanche deposit and an extensive, buried, debris flow deposit. A line of low seamounts on the subducting plate acts as a dam preventing modern turbidity currents from reaching the Kermadec Trench. Major margin collapse probably occurred in the wake of a large subducting seamount; this seamount and its wake debris flow probably dammed the trench from 2 Ma to 0.5 Ma. 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B. Lewis et al.</title><title type="short">The dammed Hiurangi Trough</title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#a1"><personName><givenNames>Keith B.</givenNames><familyName>Lewis</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#a2"><personName><givenNames>Jean‐Yves</givenNames><familyName>Collot</familyName></personName></creator><creator creatorRole="author" xml:id="cr3" affiliationRef="#a3"><personName><givenNames>Serge E.</givenNames><familyName>Lallem</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="a1" countryCode="NZ"><unparsedAffiliation>NIWA, PO Box 14901, Wellington, New Zealand</unparsedAffiliation></affiliation><affiliation xml:id="a2" countryCode="FR"><unparsedAffiliation>ORSTOM, Villefranche sur mer, France</unparsedAffiliation></affiliation><affiliation xml:id="a3" countryCode="FR"><unparsedAffiliation>Université de Montpellier II, Montpellier, France</unparsedAffiliation></affiliation></affiliationGroup><abstractGroup><abstract type="main" xml:lang="en"><p>The Hikurangi Trough, off eastern New Zealand, is at the southern end of the Tonga–Kermadec–Hikurangi subduction system, which merges into a zone of intracontinental transform. The trough is mainly a turbidite‐filled structural trench but includes an oblique‐collision, foredeep basin. Its northern end has a sharp boundary with the deep, sediment‐starved, Kermadec Trench.</p><p>Swath‐mapping, sampling and seismic surveys show modern sediment input is mainly via Kaikoura Canyon, which intercepts littoral drift at the southern, intracontinental apex of the trough, with minor input from seep gullies. Glacial age input was via many canyons and about an order of magnitude greater. Beyond a narrow, gravelly, intracontinental foredeep, the southern trench‐basin is characterized by a channel meandering around the seaward edge of mainly Plio‐Pleistocene, overbank deposits that reach 5 km in thickness. The aggrading channel has sandy turbidites, but low‐backscatter, and long‐wavelength bedforms indicating thick flows. Levées on both sides are capped by tangentially aligned mudwaves on the outsides of bends, indicating centrifugal overflow from heads of dense, fast‐moving, autosuspension flows. The higher, left‐bank levée also has levée‐parallel mudwaves, indicating Coriolis and/or boundary currents effects on dilute flows or tail plumes.</p><p>In the northern trough, basin‐fill is generally less than 2 km thick and includes widespread overbank turbidites, a massive, blocky, avalanche deposit and an extensive, buried, debris flow deposit. A line of low seamounts on the subducting plate acts as a dam preventing modern turbidity currents from reaching the Kermadec Trench. Major margin collapse probably occurred in the wake of a large subducting seamount; this seamount and its wake debris flow probably dammed the trench from 2 Ma to 0.5 Ma. 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The trough is mainly a turbidite‐filled structural trench but includes an oblique‐collision, foredeep basin. Its northern end has a sharp boundary with the deep, sediment‐starved, Kermadec Trench. Swath‐mapping, sampling and seismic surveys show modern sediment input is mainly via Kaikoura Canyon, which intercepts littoral drift at the southern, intracontinental apex of the trough, with minor input from seep gullies. Glacial age input was via many canyons and about an order of magnitude greater. Beyond a narrow, gravelly, intracontinental foredeep, the southern trench‐basin is characterized by a channel meandering around the seaward edge of mainly Plio‐Pleistocene, overbank deposits that reach 5 km in thickness. The aggrading channel has sandy turbidites, but low‐backscatter, and long‐wavelength bedforms indicating thick flows. Levées on both sides are capped by tangentially aligned mudwaves on the outsides of bends, indicating centrifugal overflow from heads of dense, fast‐moving, autosuspension flows. The higher, left‐bank levée also has levée‐parallel mudwaves, indicating Coriolis and/or boundary currents effects on dilute flows or tail plumes. In the northern trough, basin‐fill is generally less than 2 km thick and includes widespread overbank turbidites, a massive, blocky, avalanche deposit and an extensive, buried, debris flow deposit. A line of low seamounts on the subducting plate acts as a dam preventing modern turbidity currents from reaching the Kermadec Trench. Major margin collapse probably occurred in the wake of a large subducting seamount; this seamount and its wake debris flow probably dammed the trench from 2 Ma to 0.5 Ma. Before this, similar dams may have re‐routed turbidity currents across the plateau.</abstract><relatedItem type="host"><titleInfo><title>Basin Research</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">0950-091X</identifier><identifier type="eISSN">1365-2117</identifier><identifier type="DOI">10.1111/(ISSN)1365-2117</identifier><identifier type="PublisherID">BRE</identifier><part><date>1998</date><detail type="volume"><caption>vol.</caption><number>10</number></detail><detail type="issue"><caption>no.</caption><number>4</number></detail><extent unit="pages"><start>441</start><end>468</end><total>28</total></extent></part></relatedItem><identifier type="istex">E5D0EDDDF2E8EBDB67A82CDAD88F5095A8DA0E23</identifier><identifier type="DOI">10.1046/j.1365-2117.1998.00080.x</identifier><identifier type="ArticleID">BRE080</identifier><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>Blackwell Science Ltd</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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