The Nicoya Convergent Margin-A region of exceptionally low heat flow
Over 100 measurements of seafloor heat flow reveal that the accretionary complex adjacent to the Nicoya Peninsula is characterized by remarkably low heat flow; values over the accretionary prism average 28 mW/m², and values in the trench and the ocean crust seaward of the trench average 14 mW/m². We...
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| Veröffentlicht in: | Geophysical research letters 1996-04, Vol.23 (8), p.891-894 |
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| container_title | Geophysical research letters |
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| creator | Langseth, Marcus G. Silver, Eli A. |
| description | Over 100 measurements of seafloor heat flow reveal that the accretionary complex adjacent to the Nicoya Peninsula is characterized by remarkably low heat flow; values over the accretionary prism average 28 mW/m², and values in the trench and the ocean crust seaward of the trench average 14 mW/m². We attribute the low heat flow to effective hydrothermal cooling of the upper crust on the subducting plate and suggest that extensional faults created by flexure of the lithosphere enhance hydrothermal circulation. Thermal models show that subduction of low temperature crust combined with significant frictional heating at the decollement can explain the low and uniform heat flow. Disparity between heat flow values observed on the lower trench slope with model results suggests upward advection of heat by porewater flux through broadly distributed conduits. |
| doi_str_mv | 10.1029/96GL00733 |
| format | Article |
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We attribute the low heat flow to effective hydrothermal cooling of the upper crust on the subducting plate and suggest that extensional faults created by flexure of the lithosphere enhance hydrothermal circulation. Thermal models show that subduction of low temperature crust combined with significant frictional heating at the decollement can explain the low and uniform heat flow. 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Disparity between heat flow values observed on the lower trench slope with model results suggests upward advection of heat by porewater flux through broadly distributed conduits.</description><subject>Cooling</subject><subject>Crusts</subject><subject>Geophysics</subject><subject>Heat transfer</subject><subject>Heat transmission</subject><subject>Heating</subject><subject>Marine</subject><subject>Peninsulas</subject><subject>Trenches</subject><issn>0094-8276</issn><issn>1944-8007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1996</creationdate><recordtype>article</recordtype><recordid>eNqFkE1PwkAYhDdGExE9-A_2ZPRQ3O_uHgkqGEETg-G4Wdq3UC0t7haBf28Jhpt6mpnkmTkMQpeUdChh5tao_pCQmPMj1KJGiEg36Ri1CDGNZ7E6RWchvBNCOOG0he7Gc8DPeVJtHe5V5Rf4GZQ1Hjk_y8uoiz3M8qrEVYZhk8CyboIrii0uqjWeg6tx1rhzdJK5IsDFj7bR28P9uDeIhi_9x153GDlhCI_oVGk9paliSUIzodLEpZngwjCdykQ4TaVxRjAtZRbTbKpTQ1KjKSgDGlLG2-h6v7v01ecKQm0XeUigKFwJ1SpYqgTjREqpGvTqb1QqJWTz07-bkglBKKOkQW_2aOKrEDxkdunzhfNbS4ndvW8P7zdsZ8-u8wK2v4O2_zo0lO0K0b6Qhxo2h4LzH1bFPJZ28ty3YvI0GQ0m0kr-DV9lkc0</recordid><startdate>19960415</startdate><enddate>19960415</enddate><creator>Langseth, Marcus G.</creator><creator>Silver, Eli A.</creator><general>Blackwell Publishing Ltd</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope><scope>7TB</scope><scope>8FD</scope><scope>FR3</scope><scope>H8D</scope><scope>KR7</scope><scope>L7M</scope></search><sort><creationdate>19960415</creationdate><title>The Nicoya Convergent Margin-A region of exceptionally low heat flow</title><author>Langseth, Marcus G. ; Silver, Eli A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a4903-1b688b1d62cc1f46dcadf434928d5c4a8159a942855f71fb8d90d981e69e8ed23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1996</creationdate><topic>Cooling</topic><topic>Crusts</topic><topic>Geophysics</topic><topic>Heat transfer</topic><topic>Heat transmission</topic><topic>Heating</topic><topic>Marine</topic><topic>Peninsulas</topic><topic>Trenches</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Langseth, Marcus G.</creatorcontrib><creatorcontrib>Silver, Eli A.</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>Oceanic Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Geophysical research letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Langseth, Marcus G.</au><au>Silver, Eli A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The Nicoya Convergent Margin-A region of exceptionally low heat flow</atitle><jtitle>Geophysical research letters</jtitle><addtitle>Geophys. Res. Lett</addtitle><date>1996-04-15</date><risdate>1996</risdate><volume>23</volume><issue>8</issue><spage>891</spage><epage>894</epage><pages>891-894</pages><issn>0094-8276</issn><eissn>1944-8007</eissn><abstract>Over 100 measurements of seafloor heat flow reveal that the accretionary complex adjacent to the Nicoya Peninsula is characterized by remarkably low heat flow; values over the accretionary prism average 28 mW/m², and values in the trench and the ocean crust seaward of the trench average 14 mW/m². We attribute the low heat flow to effective hydrothermal cooling of the upper crust on the subducting plate and suggest that extensional faults created by flexure of the lithosphere enhance hydrothermal circulation. Thermal models show that subduction of low temperature crust combined with significant frictional heating at the decollement can explain the low and uniform heat flow. 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| identifier | ISSN: 0094-8276 |
| ispartof | Geophysical research letters, 1996-04, Vol.23 (8), p.891-894 |
| issn | 0094-8276 1944-8007 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_1642305556 |
| source | Wiley Online Library All Journals |
| subjects | Cooling Crusts Geophysics Heat transfer Heat transmission Heating Marine Peninsulas Trenches |
| title | The Nicoya Convergent Margin-A region of exceptionally low heat flow |
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