Location of Pacific and Indian mid-ocean ridge-type mantle in two time slices:Evidence from Pb, Sr, and Nd isotopes for Cenozoic Australian basalts
Pb, Sr, and Nd isotope data for Cenozoic basalts in eastern Australia indicate that mantle isotope signatures of Pacific Ocean midoceanic ridge basalts (MORB) type characterize the lava-field basalts (55-14 Ma) in southeastern Australia, whereas mantle isotope signatures of Indian Ocean MORB type ch...
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/ceacf802-fbaa-487d-b3c3-6d0d4fedb6ec 2023-05-15T18:25:31+02:00 Location of Pacific and Indian mid-ocean ridge-type mantle in two time slices:Evidence from Pb, Sr, and Nd isotopes for Cenozoic Australian basalts Zhang, Ming O'Reilly, Suzanne Y. Chen, Daogong 1999-01 https://researchers.mq.edu.au/en/publications/ceacf802-fbaa-487d-b3c3-6d0d4fedb6ec https://doi.org/10.1130/0091-7613(1999)027<0039:LOPAIM>2.3.CO;2 http://www.scopus.com/inward/record.url?scp=84879881029&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Zhang , M , O'Reilly , S Y & Chen , D 1999 , ' Location of Pacific and Indian mid-ocean ridge-type mantle in two time slices : Evidence from Pb, Sr, and Nd isotopes for Cenozoic Australian basalts ' , Geology , vol. 27 , no. 1 , pp. 39-42 . https://doi.org/10.1130/0091-7613(1999)027<0039:LOPAIM>2.3.CO;2 article 1999 ftmacquarieunicr https://doi.org/10.1130/0091-7613(1999)027<0039:LOPAIM>2.3.CO;2 2022-11-06T06:43:15Z Pb, Sr, and Nd isotope data for Cenozoic basalts in eastern Australia indicate that mantle isotope signatures of Pacific Ocean midoceanic ridge basalts (MORB) type characterize the lava-field basalts (55-14 Ma) in southeastern Australia, whereas mantle isotope signatures of Indian Ocean MORB type characterize younger basalts (6-0 Ma) from northeastern Australia. This discovery further constrains the secular distribution of major asthenospheric mantle reservoirs represented by the Pacific and Indian Ocean MORB sources during and following the breakup of eastern Gondwana and tracks, for the first time, the locus of the boundary of the two reservoirs beneath the Australian continent. These new data fill the gap between previous Indian Ocean MORB-Pacific Ocean MORB boundary locations determined from backarc basin basalts in the southwestern Pacific Ocean and ocean-floor basalts in the Southern Ocean. We propose that the Indian Ocean MORB source is a long-term asthenospheric reservoir beneath most of eastern Gondwana and that the westward migration of the Pacific Ocean MORB source may have been associated with the opening of the Tasman Sea (ca. 85-60 Ma) along a broad front southeast of the Australian continent. Article in Journal/Newspaper Southern Ocean Macquarie University Research Portal Southern Ocean Pacific Indian |
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Open Polar |
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Macquarie University Research Portal |
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ftmacquarieunicr |
language |
English |
description |
Pb, Sr, and Nd isotope data for Cenozoic basalts in eastern Australia indicate that mantle isotope signatures of Pacific Ocean midoceanic ridge basalts (MORB) type characterize the lava-field basalts (55-14 Ma) in southeastern Australia, whereas mantle isotope signatures of Indian Ocean MORB type characterize younger basalts (6-0 Ma) from northeastern Australia. This discovery further constrains the secular distribution of major asthenospheric mantle reservoirs represented by the Pacific and Indian Ocean MORB sources during and following the breakup of eastern Gondwana and tracks, for the first time, the locus of the boundary of the two reservoirs beneath the Australian continent. These new data fill the gap between previous Indian Ocean MORB-Pacific Ocean MORB boundary locations determined from backarc basin basalts in the southwestern Pacific Ocean and ocean-floor basalts in the Southern Ocean. We propose that the Indian Ocean MORB source is a long-term asthenospheric reservoir beneath most of eastern Gondwana and that the westward migration of the Pacific Ocean MORB source may have been associated with the opening of the Tasman Sea (ca. 85-60 Ma) along a broad front southeast of the Australian continent. |
format |
Article in Journal/Newspaper |
author |
Zhang, Ming O'Reilly, Suzanne Y. Chen, Daogong |
spellingShingle |
Zhang, Ming O'Reilly, Suzanne Y. Chen, Daogong Location of Pacific and Indian mid-ocean ridge-type mantle in two time slices:Evidence from Pb, Sr, and Nd isotopes for Cenozoic Australian basalts |
author_facet |
Zhang, Ming O'Reilly, Suzanne Y. Chen, Daogong |
author_sort |
Zhang, Ming |
title |
Location of Pacific and Indian mid-ocean ridge-type mantle in two time slices:Evidence from Pb, Sr, and Nd isotopes for Cenozoic Australian basalts |
title_short |
Location of Pacific and Indian mid-ocean ridge-type mantle in two time slices:Evidence from Pb, Sr, and Nd isotopes for Cenozoic Australian basalts |
title_full |
Location of Pacific and Indian mid-ocean ridge-type mantle in two time slices:Evidence from Pb, Sr, and Nd isotopes for Cenozoic Australian basalts |
title_fullStr |
Location of Pacific and Indian mid-ocean ridge-type mantle in two time slices:Evidence from Pb, Sr, and Nd isotopes for Cenozoic Australian basalts |
title_full_unstemmed |
Location of Pacific and Indian mid-ocean ridge-type mantle in two time slices:Evidence from Pb, Sr, and Nd isotopes for Cenozoic Australian basalts |
title_sort |
location of pacific and indian mid-ocean ridge-type mantle in two time slices:evidence from pb, sr, and nd isotopes for cenozoic australian basalts |
publishDate |
1999 |
url |
https://researchers.mq.edu.au/en/publications/ceacf802-fbaa-487d-b3c3-6d0d4fedb6ec https://doi.org/10.1130/0091-7613(1999)027<0039:LOPAIM>2.3.CO;2 http://www.scopus.com/inward/record.url?scp=84879881029&partnerID=8YFLogxK |
geographic |
Southern Ocean Pacific Indian |
geographic_facet |
Southern Ocean Pacific Indian |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Zhang , M , O'Reilly , S Y & Chen , D 1999 , ' Location of Pacific and Indian mid-ocean ridge-type mantle in two time slices : Evidence from Pb, Sr, and Nd isotopes for Cenozoic Australian basalts ' , Geology , vol. 27 , no. 1 , pp. 39-42 . https://doi.org/10.1130/0091-7613(1999)027<0039:LOPAIM>2.3.CO;2 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1130/0091-7613(1999)027<0039:LOPAIM>2.3.CO;2 |
_version_ |
1766207028144898048 |