Kerguelen Hotspot Magma Output since 130 Ma
The Kerguelen hotspot (Indian Ocean) has produced basalt for ∼130 Myr, among the longest known volcanic records from a single source. New and published 40 Ar/ 39 Ar age determinations from the Kerguelen Plateau, Broken Ridge, Rajmahal Traps, and Bunbury basalts, and of Indian and Antarctic dikes hel...
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fthighwire:oai:open-archive.highwire.org:petrology:43/7/1121 2023-05-15T13:40:01+02:00 Kerguelen Hotspot Magma Output since 130 Ma COFFIN, MILLARD F. PRINGLE, M. S. DUNCAN, R. A. GLADCZENKO, T. P. STOREY, M. MÜLLER, R. D. GAHAGAN, L. A. 2002-07-01 00:00:00.0 text/html http://petrology.oxfordjournals.org/cgi/content/short/43/7/1121 https://doi.org/10.1093/petrology/43.7.1121 en eng Oxford University Press http://petrology.oxfordjournals.org/cgi/content/short/43/7/1121 http://dx.doi.org/10.1093/petrology/43.7.1121 Copyright (C) 2002, Oxford University Press ARTICLES TEXT 2002 fthighwire https://doi.org/10.1093/petrology/43.7.1121 2013-05-27T15:51:18Z The Kerguelen hotspot (Indian Ocean) has produced basalt for ∼130 Myr, among the longest known volcanic records from a single source. New and published 40 Ar/ 39 Ar age determinations from the Kerguelen Plateau, Broken Ridge, Rajmahal Traps, and Bunbury basalts, and of Indian and Antarctic dikes help to document the hotspot’s history. Using radiometric dates and crustal structure determined from geophysical data and drilling results, we calculate the magmatic output of the Kerguelen hotspot through time. Output rates have varied in ways not predicted by current geodynamic models; maximum eruption volumes postdate the initial surface manifestation of the hotspot as well as break-up between Antarctica and India by ≥15 Myr, and magma output rates were high, as well as geographically diverse, over an interval of 25 Myr, from ∼120 to ∼95 Ma. We propose two alternatives to the standard mantle plume paradigm, one involving multiple plume sources, and another consisting of a single, but dismembered plume source. Text Antarc* Antarctic Antarctica HighWire Press (Stanford University) Antarctic Broken Ridge ENVELOPE(-92.318,-92.318,79.552,79.552) Indian Kerguelen Journal of Petrology 43 7 1121 1137 |
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HighWire Press (Stanford University) |
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English |
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ARTICLES |
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ARTICLES COFFIN, MILLARD F. PRINGLE, M. S. DUNCAN, R. A. GLADCZENKO, T. P. STOREY, M. MÜLLER, R. D. GAHAGAN, L. A. Kerguelen Hotspot Magma Output since 130 Ma |
topic_facet |
ARTICLES |
description |
The Kerguelen hotspot (Indian Ocean) has produced basalt for ∼130 Myr, among the longest known volcanic records from a single source. New and published 40 Ar/ 39 Ar age determinations from the Kerguelen Plateau, Broken Ridge, Rajmahal Traps, and Bunbury basalts, and of Indian and Antarctic dikes help to document the hotspot’s history. Using radiometric dates and crustal structure determined from geophysical data and drilling results, we calculate the magmatic output of the Kerguelen hotspot through time. Output rates have varied in ways not predicted by current geodynamic models; maximum eruption volumes postdate the initial surface manifestation of the hotspot as well as break-up between Antarctica and India by ≥15 Myr, and magma output rates were high, as well as geographically diverse, over an interval of 25 Myr, from ∼120 to ∼95 Ma. We propose two alternatives to the standard mantle plume paradigm, one involving multiple plume sources, and another consisting of a single, but dismembered plume source. |
format |
Text |
author |
COFFIN, MILLARD F. PRINGLE, M. S. DUNCAN, R. A. GLADCZENKO, T. P. STOREY, M. MÜLLER, R. D. GAHAGAN, L. A. |
author_facet |
COFFIN, MILLARD F. PRINGLE, M. S. DUNCAN, R. A. GLADCZENKO, T. P. STOREY, M. MÜLLER, R. D. GAHAGAN, L. A. |
author_sort |
COFFIN, MILLARD F. |
title |
Kerguelen Hotspot Magma Output since 130 Ma |
title_short |
Kerguelen Hotspot Magma Output since 130 Ma |
title_full |
Kerguelen Hotspot Magma Output since 130 Ma |
title_fullStr |
Kerguelen Hotspot Magma Output since 130 Ma |
title_full_unstemmed |
Kerguelen Hotspot Magma Output since 130 Ma |
title_sort |
kerguelen hotspot magma output since 130 ma |
publisher |
Oxford University Press |
publishDate |
2002 |
url |
http://petrology.oxfordjournals.org/cgi/content/short/43/7/1121 https://doi.org/10.1093/petrology/43.7.1121 |
long_lat |
ENVELOPE(-92.318,-92.318,79.552,79.552) |
geographic |
Antarctic Broken Ridge Indian Kerguelen |
geographic_facet |
Antarctic Broken Ridge Indian Kerguelen |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
http://petrology.oxfordjournals.org/cgi/content/short/43/7/1121 http://dx.doi.org/10.1093/petrology/43.7.1121 |
op_rights |
Copyright (C) 2002, Oxford University Press |
op_doi |
https://doi.org/10.1093/petrology/43.7.1121 |
container_title |
Journal of Petrology |
container_volume |
43 |
container_issue |
7 |
container_start_page |
1121 |
op_container_end_page |
1137 |
_version_ |
1766126954757488640 |