Positive geothermal anomalies in oceanic crust of Cretaceous age offshore Kamchatka
Heat flow measurements were carried out in 2009 offshore Kamchatka during the German-Russian joint-expedition KALMAR. An area with elevated heat flow in oceanic crust of Cretaceous age – detected ~30 yr ago in the course of several Russian heat flow surveys – was revisited. One previous interpretati...
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2011
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Online Access: | https://doi.org/10.5194/se-2-191-2011 https://doaj.org/article/09a33669e6854e75a26f2121f2d6a4b4 |
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ftdoajarticles:oai:doaj.org/article:09a33669e6854e75a26f2121f2d6a4b4 2023-05-15T16:58:41+02:00 Positive geothermal anomalies in oceanic crust of Cretaceous age offshore Kamchatka G. Delisle 2011-09-01T00:00:00Z https://doi.org/10.5194/se-2-191-2011 https://doaj.org/article/09a33669e6854e75a26f2121f2d6a4b4 EN eng Copernicus Publications http://www.solid-earth.net/2/191/2011/se-2-191-2011.pdf https://doaj.org/toc/1869-9510 https://doaj.org/toc/1869-9529 doi:10.5194/se-2-191-2011 1869-9510 1869-9529 https://doaj.org/article/09a33669e6854e75a26f2121f2d6a4b4 Solid Earth, Vol 2, Iss 2, Pp 191-198 (2011) Geology QE1-996.5 Stratigraphy QE640-699 article 2011 ftdoajarticles https://doi.org/10.5194/se-2-191-2011 2022-12-31T12:46:14Z Heat flow measurements were carried out in 2009 offshore Kamchatka during the German-Russian joint-expedition KALMAR. An area with elevated heat flow in oceanic crust of Cretaceous age – detected ~30 yr ago in the course of several Russian heat flow surveys – was revisited. One previous interpretation postulated anomalous lithospheric conditions or a connection between a postulated mantle plume at great depth (>200 km) as the source for the observed high heat flow. However, the positive heat flow anomaly – as our bathymetric data show – is closely associated with the fragmentation of the western flank of the Meiji Seamount into a horst and graben structure initiated during descent of the oceanic crust into the subduction zone offshore Kamchatka. This paper offers an alternative interpretation, which connects high heat flow primarily with natural convection of fluids in the fragmented rock mass and, as a potential additional factor, high rates of erosion, for which evidence is available from our collected bathymetric image. Given high erosion rates, warm rock material at depth rises to nearer the sea floor, where it cools and causes temporary elevated heat flow. Article in Journal/Newspaper Kamchatka Directory of Open Access Journals: DOAJ Articles Meiji Seamount ENVELOPE(164.750,164.750,53.083,53.083) Solid Earth 2 2 191 198 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geology QE1-996.5 Stratigraphy QE640-699 |
spellingShingle |
Geology QE1-996.5 Stratigraphy QE640-699 G. Delisle Positive geothermal anomalies in oceanic crust of Cretaceous age offshore Kamchatka |
topic_facet |
Geology QE1-996.5 Stratigraphy QE640-699 |
description |
Heat flow measurements were carried out in 2009 offshore Kamchatka during the German-Russian joint-expedition KALMAR. An area with elevated heat flow in oceanic crust of Cretaceous age – detected ~30 yr ago in the course of several Russian heat flow surveys – was revisited. One previous interpretation postulated anomalous lithospheric conditions or a connection between a postulated mantle plume at great depth (>200 km) as the source for the observed high heat flow. However, the positive heat flow anomaly – as our bathymetric data show – is closely associated with the fragmentation of the western flank of the Meiji Seamount into a horst and graben structure initiated during descent of the oceanic crust into the subduction zone offshore Kamchatka. This paper offers an alternative interpretation, which connects high heat flow primarily with natural convection of fluids in the fragmented rock mass and, as a potential additional factor, high rates of erosion, for which evidence is available from our collected bathymetric image. Given high erosion rates, warm rock material at depth rises to nearer the sea floor, where it cools and causes temporary elevated heat flow. |
format |
Article in Journal/Newspaper |
author |
G. Delisle |
author_facet |
G. Delisle |
author_sort |
G. Delisle |
title |
Positive geothermal anomalies in oceanic crust of Cretaceous age offshore Kamchatka |
title_short |
Positive geothermal anomalies in oceanic crust of Cretaceous age offshore Kamchatka |
title_full |
Positive geothermal anomalies in oceanic crust of Cretaceous age offshore Kamchatka |
title_fullStr |
Positive geothermal anomalies in oceanic crust of Cretaceous age offshore Kamchatka |
title_full_unstemmed |
Positive geothermal anomalies in oceanic crust of Cretaceous age offshore Kamchatka |
title_sort |
positive geothermal anomalies in oceanic crust of cretaceous age offshore kamchatka |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://doi.org/10.5194/se-2-191-2011 https://doaj.org/article/09a33669e6854e75a26f2121f2d6a4b4 |
long_lat |
ENVELOPE(164.750,164.750,53.083,53.083) |
geographic |
Meiji Seamount |
geographic_facet |
Meiji Seamount |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_source |
Solid Earth, Vol 2, Iss 2, Pp 191-198 (2011) |
op_relation |
http://www.solid-earth.net/2/191/2011/se-2-191-2011.pdf https://doaj.org/toc/1869-9510 https://doaj.org/toc/1869-9529 doi:10.5194/se-2-191-2011 1869-9510 1869-9529 https://doaj.org/article/09a33669e6854e75a26f2121f2d6a4b4 |
op_doi |
https://doi.org/10.5194/se-2-191-2011 |
container_title |
Solid Earth |
container_volume |
2 |
container_issue |
2 |
container_start_page |
191 |
op_container_end_page |
198 |
_version_ |
1766050762043949056 |