Thermal regime of the Southeast Indian Ridge between 88°E and 140°E: Remarks on the subsidence of the ridge flanks
The flanks of the Southeast Indian Ridge are characterized by anomalously low subsidence rates for the 0–25 Ma period: less than 300 m Ma -1/2 between 101°E and 120°E and less than 260 m Ma-1/2 within the Australian-Antarctic Discordance (AAD), between 120°E and 128°E. The expected along-axis variat...
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ftdatacite:10.7916/d8-29xg-ns32 2023-05-15T13:59:24+02:00 Thermal regime of the Southeast Indian Ridge between 88°E and 140°E: Remarks on the subsidence of the ridge flanks Geli, Louis Cochran, James R. Lee, Tien-Chang Francheteau, Jean Labails, Cinthia Foucher, Christine Christie, David 2007 https://dx.doi.org/10.7916/d8-29xg-ns32 https://academiccommons.columbia.edu/doi/10.7916/d8-29xg-ns32 unknown Columbia University https://dx.doi.org/10.1029/2006jb004578 Geophysics FOS Earth and related environmental sciences Marine geophysics Subsidences Earth movements Mid-ocean ridges Text Articles article-journal ScholarlyArticle 2007 ftdatacite https://doi.org/10.7916/d8-29xg-ns32 https://doi.org/10.1029/2006jb004578 2021-11-05T12:55:41Z The flanks of the Southeast Indian Ridge are characterized by anomalously low subsidence rates for the 0–25 Ma period: less than 300 m Ma -1/2 between 101°E and 120°E and less than 260 m Ma-1/2 within the Australian-Antarctic Discordance (AAD), between 120°E and 128°E. The expected along-axis variation in mantle temperature (~50°C) is too small to explain this observation, even when the temperature dependence of the mantle physical properties is accounted for. We successively analyze the effect on subsidence of different factors, such as variations in crustal thickness; the dynamic contribution of an old, detached slab supposedly present within the mantle below the AAD; and depletion in ϕm, a parameter here defined as the ‘‘ubiquitously distributed melt fraction’’ within the asthenosphere. These effects may all contribute to the observed, anomalously low subsidence rate of the ridge flanks, with the most significant contribution being probably related to the depletion in ϕm. However, these effects have a deep-seated origin that cannot explain the abruptness of the transition across the fracture zones that delineate the boundaries of the AAD, near 120°E and near 128°E, respectively. Text Antarc* Antarctic DataCite Metadata Store (German National Library of Science and Technology) Antarctic Indian Southeast Indian Ridge ENVELOPE(110.000,110.000,-50.000,-50.000) Australian-Antarctic Discordance ENVELOPE(124.000,124.000,-49.000,-49.000) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geophysics FOS Earth and related environmental sciences Marine geophysics Subsidences Earth movements Mid-ocean ridges |
spellingShingle |
Geophysics FOS Earth and related environmental sciences Marine geophysics Subsidences Earth movements Mid-ocean ridges Geli, Louis Cochran, James R. Lee, Tien-Chang Francheteau, Jean Labails, Cinthia Foucher, Christine Christie, David Thermal regime of the Southeast Indian Ridge between 88°E and 140°E: Remarks on the subsidence of the ridge flanks |
topic_facet |
Geophysics FOS Earth and related environmental sciences Marine geophysics Subsidences Earth movements Mid-ocean ridges |
description |
The flanks of the Southeast Indian Ridge are characterized by anomalously low subsidence rates for the 0–25 Ma period: less than 300 m Ma -1/2 between 101°E and 120°E and less than 260 m Ma-1/2 within the Australian-Antarctic Discordance (AAD), between 120°E and 128°E. The expected along-axis variation in mantle temperature (~50°C) is too small to explain this observation, even when the temperature dependence of the mantle physical properties is accounted for. We successively analyze the effect on subsidence of different factors, such as variations in crustal thickness; the dynamic contribution of an old, detached slab supposedly present within the mantle below the AAD; and depletion in ϕm, a parameter here defined as the ‘‘ubiquitously distributed melt fraction’’ within the asthenosphere. These effects may all contribute to the observed, anomalously low subsidence rate of the ridge flanks, with the most significant contribution being probably related to the depletion in ϕm. However, these effects have a deep-seated origin that cannot explain the abruptness of the transition across the fracture zones that delineate the boundaries of the AAD, near 120°E and near 128°E, respectively. |
format |
Text |
author |
Geli, Louis Cochran, James R. Lee, Tien-Chang Francheteau, Jean Labails, Cinthia Foucher, Christine Christie, David |
author_facet |
Geli, Louis Cochran, James R. Lee, Tien-Chang Francheteau, Jean Labails, Cinthia Foucher, Christine Christie, David |
author_sort |
Geli, Louis |
title |
Thermal regime of the Southeast Indian Ridge between 88°E and 140°E: Remarks on the subsidence of the ridge flanks |
title_short |
Thermal regime of the Southeast Indian Ridge between 88°E and 140°E: Remarks on the subsidence of the ridge flanks |
title_full |
Thermal regime of the Southeast Indian Ridge between 88°E and 140°E: Remarks on the subsidence of the ridge flanks |
title_fullStr |
Thermal regime of the Southeast Indian Ridge between 88°E and 140°E: Remarks on the subsidence of the ridge flanks |
title_full_unstemmed |
Thermal regime of the Southeast Indian Ridge between 88°E and 140°E: Remarks on the subsidence of the ridge flanks |
title_sort |
thermal regime of the southeast indian ridge between 88°e and 140°e: remarks on the subsidence of the ridge flanks |
publisher |
Columbia University |
publishDate |
2007 |
url |
https://dx.doi.org/10.7916/d8-29xg-ns32 https://academiccommons.columbia.edu/doi/10.7916/d8-29xg-ns32 |
long_lat |
ENVELOPE(110.000,110.000,-50.000,-50.000) ENVELOPE(124.000,124.000,-49.000,-49.000) |
geographic |
Antarctic Indian Southeast Indian Ridge Australian-Antarctic Discordance |
geographic_facet |
Antarctic Indian Southeast Indian Ridge Australian-Antarctic Discordance |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://dx.doi.org/10.1029/2006jb004578 |
op_doi |
https://doi.org/10.7916/d8-29xg-ns32 https://doi.org/10.1029/2006jb004578 |
_version_ |
1766267936111067136 |