Not So Hot "Hot Spots" in the Oceanic Mantle
Excess volcanism and crustal swelling associated with hot spots are generally attributed to thermal plumes upwelling from the mantle. This concept has been tested in the portion of the Mid-Atlantic Ridge between 34° and 45° (Azores hot spot). Peridotite and basalt data indicate that the upper mantle...
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American Association for the Advancement of Science (AAAS)
1990
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craaas:10.1126/science.250.4977.107 2024-06-23T07:55:06+00:00 Not So Hot "Hot Spots" in the Oceanic Mantle Bonath, Enrico 1990 http://dx.doi.org/10.1126/science.250.4977.107 https://www.science.org/doi/pdf/10.1126/science.250.4977.107 en eng American Association for the Advancement of Science (AAAS) Science volume 250, issue 4977, page 107-111 ISSN 0036-8075 1095-9203 journal-article 1990 craaas https://doi.org/10.1126/science.250.4977.107 2024-06-06T04:01:35Z Excess volcanism and crustal swelling associated with hot spots are generally attributed to thermal plumes upwelling from the mantle. This concept has been tested in the portion of the Mid-Atlantic Ridge between 34° and 45° (Azores hot spot). Peridotite and basalt data indicate that the upper mantle in the hot spot has undergone a high degree of melting relative to the mantle elsewhere in the North Atlantic. However, application of various geothermometers suggests that the temperature of equilibration of peridotites in the mantle was lower, or at least not higher, in the hot spot than elsewhere. The presence of H 2 O-rich metasomatized mantle domains, inferred from peridotite and basalt data, would lower the melting temperature of the hot spot mantle and thereby reconcile its high degree of melting with the lack of a mantle temperature anomaly. Thus, some so-called hot spots might be melting anomalies unrelated to abnormally high mantle temperature or thermal plumes. Article in Journal/Newspaper North Atlantic AAAS Resource Center (American Association for the Advancement of Science) Mid-Atlantic Ridge Science 250 4977 107 111 |
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Open Polar |
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AAAS Resource Center (American Association for the Advancement of Science) |
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craaas |
language |
English |
description |
Excess volcanism and crustal swelling associated with hot spots are generally attributed to thermal plumes upwelling from the mantle. This concept has been tested in the portion of the Mid-Atlantic Ridge between 34° and 45° (Azores hot spot). Peridotite and basalt data indicate that the upper mantle in the hot spot has undergone a high degree of melting relative to the mantle elsewhere in the North Atlantic. However, application of various geothermometers suggests that the temperature of equilibration of peridotites in the mantle was lower, or at least not higher, in the hot spot than elsewhere. The presence of H 2 O-rich metasomatized mantle domains, inferred from peridotite and basalt data, would lower the melting temperature of the hot spot mantle and thereby reconcile its high degree of melting with the lack of a mantle temperature anomaly. Thus, some so-called hot spots might be melting anomalies unrelated to abnormally high mantle temperature or thermal plumes. |
format |
Article in Journal/Newspaper |
author |
Bonath, Enrico |
spellingShingle |
Bonath, Enrico Not So Hot "Hot Spots" in the Oceanic Mantle |
author_facet |
Bonath, Enrico |
author_sort |
Bonath, Enrico |
title |
Not So Hot "Hot Spots" in the Oceanic Mantle |
title_short |
Not So Hot "Hot Spots" in the Oceanic Mantle |
title_full |
Not So Hot "Hot Spots" in the Oceanic Mantle |
title_fullStr |
Not So Hot "Hot Spots" in the Oceanic Mantle |
title_full_unstemmed |
Not So Hot "Hot Spots" in the Oceanic Mantle |
title_sort |
not so hot "hot spots" in the oceanic mantle |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
1990 |
url |
http://dx.doi.org/10.1126/science.250.4977.107 https://www.science.org/doi/pdf/10.1126/science.250.4977.107 |
geographic |
Mid-Atlantic Ridge |
geographic_facet |
Mid-Atlantic Ridge |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Science volume 250, issue 4977, page 107-111 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.250.4977.107 |
container_title |
Science |
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250 |
container_issue |
4977 |
container_start_page |
107 |
op_container_end_page |
111 |
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1802647528736292864 |