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| Titel |
Positive geothermal anomalies in oceanic crust of Cretaceous age offshore Kamchatka |
| VerfasserIn |
G. Delisle |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 2, no. 2 ; Nr. 2, no. 2 (2011-09-26), S.191-198 |
| Datensatznummer |
250000593
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| Publikation (Nr.) |
 copernicus.org/se-2-191-2011.pdf |
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| Zusammenfassung |
| 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. |
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