Absolute plate motion, mantle flow, and volcanism at the boundary between the Pacific and Indian Ocean mantle domains since 90 Ma
The Tasman Sea and the southeastern Indian Ocean are situated at the interface between the Indian and Pacific oceans mantle domains. Even though the present location of the boundary between these two reservoirs at the Australian Antarctic Discordance (AAD) is well constrained by geochemical data, it...
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ftqueensland:oai:eprints.qut.edu.au:234274 2024-02-11T09:56:59+01:00 Absolute plate motion, mantle flow, and volcanism at the boundary between the Pacific and Indian Ocean mantle domains since 90 Ma Gaina, Carmen Müller, R. Dietmar Cande, Steven C. Richards, Mark A. Gordon, Richard G. Van Der Hilst, Rob D. 2000 https://eprints.qut.edu.au/234274/ unknown American Geophysical Union doi:10.1029/GM121p0189 Gaina, Carmen, Müller, R. Dietmar, & Cande, Steven C. (2000) Absolute plate motion, mantle flow, and volcanism at the boundary between the Pacific and Indian Ocean mantle domains since 90 Ma. In Richards, Mark A., Gordon, Richard G., & Van Der Hilst, Rob D. (Eds.) The History and Dynamics of Global Plate Motions. American Geophysical Union, Washington, DC, pp. 189-210. https://eprints.qut.edu.au/234274/ 2000 American Geophysical Union This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au The History and Dynamics of Global Plate Motions Chapter in Book, Report or Conference volume 2000 ftqueensland https://doi.org/10.1029/GM121p0189 2024-01-22T23:24:19Z The Tasman Sea and the southeastern Indian Ocean are situated at the interface between the Indian and Pacific oceans mantle domains. Even though the present location of the boundary between these two reservoirs at the Australian Antarctic Discordance (AAD) is well constrained by geochemical data, its dynamic behaviour is less well understood. Here, we investigate the relationship between volcanism in and south of the Tasman Sea, absolute plate motion, spreading asymmetries and microcontinent formation. We test three hypotheses: since 90 Ma, the upper mantle east of the AAD and west of the Macquarie Triple Junction was attached to 1) the Indian-Atlantic hotspot reference frame, 2) the Pacific hotspot reference frame 3) to the Pacific hotspots from 90 to 40 Ma, and subsequently to the Atlantic-Indian hotspots, due to partial separation of the two mantle domains by subducting slabs. We find that hostspot tracks in this area are best modeled using a Pacific hotspot reference frame, confirming hypothesis (2). If a hotspot is now located close to the Balleny Islands, it could not have produced the Tasmanian seamount chain irrespective of which reference fame is chosen, contrary to previous suggestions. Seafloor spreading asymmetries and microcontinent formation in the Tasman Sea are best accounted for by plume-ridge interactions, rather than the absolute motion of the spreading ridge relative to the mantle. The short-lived nature of most hotspot volcanism in this area, as well as its geochemistry, points to a paleo-superswell in the upper mantle as its source, rather than deep seated plumes, with the exception of the Tasmantid seamounts. Book Part Antarc* Antarctic Balleny Islands Queensland University of Technology: QUT ePrints Antarctic Balleny Islands Pacific Indian Australian-Antarctic Discordance ENVELOPE(124.000,124.000,-49.000,-49.000) 189 210 |
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Open Polar |
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Queensland University of Technology: QUT ePrints |
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ftqueensland |
language |
unknown |
description |
The Tasman Sea and the southeastern Indian Ocean are situated at the interface between the Indian and Pacific oceans mantle domains. Even though the present location of the boundary between these two reservoirs at the Australian Antarctic Discordance (AAD) is well constrained by geochemical data, its dynamic behaviour is less well understood. Here, we investigate the relationship between volcanism in and south of the Tasman Sea, absolute plate motion, spreading asymmetries and microcontinent formation. We test three hypotheses: since 90 Ma, the upper mantle east of the AAD and west of the Macquarie Triple Junction was attached to 1) the Indian-Atlantic hotspot reference frame, 2) the Pacific hotspot reference frame 3) to the Pacific hotspots from 90 to 40 Ma, and subsequently to the Atlantic-Indian hotspots, due to partial separation of the two mantle domains by subducting slabs. We find that hostspot tracks in this area are best modeled using a Pacific hotspot reference frame, confirming hypothesis (2). If a hotspot is now located close to the Balleny Islands, it could not have produced the Tasmanian seamount chain irrespective of which reference fame is chosen, contrary to previous suggestions. Seafloor spreading asymmetries and microcontinent formation in the Tasman Sea are best accounted for by plume-ridge interactions, rather than the absolute motion of the spreading ridge relative to the mantle. The short-lived nature of most hotspot volcanism in this area, as well as its geochemistry, points to a paleo-superswell in the upper mantle as its source, rather than deep seated plumes, with the exception of the Tasmantid seamounts. |
author2 |
Richards, Mark A. Gordon, Richard G. Van Der Hilst, Rob D. |
format |
Book Part |
author |
Gaina, Carmen Müller, R. Dietmar Cande, Steven C. |
spellingShingle |
Gaina, Carmen Müller, R. Dietmar Cande, Steven C. Absolute plate motion, mantle flow, and volcanism at the boundary between the Pacific and Indian Ocean mantle domains since 90 Ma |
author_facet |
Gaina, Carmen Müller, R. Dietmar Cande, Steven C. |
author_sort |
Gaina, Carmen |
title |
Absolute plate motion, mantle flow, and volcanism at the boundary between the Pacific and Indian Ocean mantle domains since 90 Ma |
title_short |
Absolute plate motion, mantle flow, and volcanism at the boundary between the Pacific and Indian Ocean mantle domains since 90 Ma |
title_full |
Absolute plate motion, mantle flow, and volcanism at the boundary between the Pacific and Indian Ocean mantle domains since 90 Ma |
title_fullStr |
Absolute plate motion, mantle flow, and volcanism at the boundary between the Pacific and Indian Ocean mantle domains since 90 Ma |
title_full_unstemmed |
Absolute plate motion, mantle flow, and volcanism at the boundary between the Pacific and Indian Ocean mantle domains since 90 Ma |
title_sort |
absolute plate motion, mantle flow, and volcanism at the boundary between the pacific and indian ocean mantle domains since 90 ma |
publisher |
American Geophysical Union |
publishDate |
2000 |
url |
https://eprints.qut.edu.au/234274/ |
long_lat |
ENVELOPE(124.000,124.000,-49.000,-49.000) |
geographic |
Antarctic Balleny Islands Pacific Indian Australian-Antarctic Discordance |
geographic_facet |
Antarctic Balleny Islands Pacific Indian Australian-Antarctic Discordance |
genre |
Antarc* Antarctic Balleny Islands |
genre_facet |
Antarc* Antarctic Balleny Islands |
op_source |
The History and Dynamics of Global Plate Motions |
op_relation |
doi:10.1029/GM121p0189 Gaina, Carmen, Müller, R. Dietmar, & Cande, Steven C. (2000) Absolute plate motion, mantle flow, and volcanism at the boundary between the Pacific and Indian Ocean mantle domains since 90 Ma. In Richards, Mark A., Gordon, Richard G., & Van Der Hilst, Rob D. (Eds.) The History and Dynamics of Global Plate Motions. American Geophysical Union, Washington, DC, pp. 189-210. https://eprints.qut.edu.au/234274/ |
op_rights |
2000 American Geophysical Union This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au |
op_doi |
https://doi.org/10.1029/GM121p0189 |
container_start_page |
189 |
op_container_end_page |
210 |
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1790607581185572864 |