Seamounts off the West Antarctic margin: A case for non-hotspot driven intraplate volcanism
New radiometric age and geochemical data of volcanic rocks from the guyot-type Marie Byrd Seamounts (MBS) and the De Gerlache Seamounts and Peter I Island (Amundsen Sea) are presented. 40Ar/39Ar ages of the shield phase of three MBS are Early Cenozoic (65 to 56 Ma) and indicate formation well after...
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ftawi:oai:epic.awi.de:33429 2024-09-15T17:39:03+00:00 Seamounts off the West Antarctic margin: A case for non-hotspot driven intraplate volcanism Kipf, Andrea Hauff, Folkmar Werner, Reinhard Gohl, Karsten van den Bogaard, Paul Hoernle, Kaj Maicher, D. Klügel, A. 2014-05 application/pdf https://epic.awi.de/id/eprint/33429/ https://epic.awi.de/id/eprint/33429/1/Kipf-etal_Marie-Byrd-Seamounts_GondwanaResearch_2014.pdf https://hdl.handle.net/10013/epic.42470 https://hdl.handle.net/10013/epic.42470.d001 unknown ELSEVIER SCIENCE BV https://epic.awi.de/id/eprint/33429/1/Kipf-etal_Marie-Byrd-Seamounts_GondwanaResearch_2014.pdf https://hdl.handle.net/10013/epic.42470.d001 Kipf, A. , Hauff, F. , Werner, R. , Gohl, K. orcid:0000-0002-9558-2116 , van den Bogaard, P. , Hoernle, K. , Maicher, D. and Klügel, A. (2014) Seamounts off the West Antarctic margin: A case for non-hotspot driven intraplate volcanism , Gondwana Research, 25 (4), pp. 1660-1679 . doi:10.1016/j.gr.2013.06.013 <https://doi.org/10.1016/j.gr.2013.06.013> , hdl:10013/epic.42470 EPIC3Gondwana Research, ELSEVIER SCIENCE BV, 25(4), pp. 1660-1679, ISSN: 1342-937X Article isiRev 2014 ftawi https://doi.org/10.1016/j.gr.2013.06.013 2024-06-24T04:07:26Z New radiometric age and geochemical data of volcanic rocks from the guyot-type Marie Byrd Seamounts (MBS) and the De Gerlache Seamounts and Peter I Island (Amundsen Sea) are presented. 40Ar/39Ar ages of the shield phase of three MBS are Early Cenozoic (65 to 56 Ma) and indicate formation well after creation of the Pacific-Antarctic Ridge. A Pliocene age (3.0 Ma) documents a younger phase of volcanism at one MBS and a Pleistocene age (1.8 Ma) for the submarine base of Peter I Island. Together with published data, the new age data imply that Cenozoic intraplate magmatism occurred at distinct time intervals in spatially confined areas of the Amundsen Sea, excluding an origin through a fixed mantle plume. Peter I Island appears strongly influenced by an EMII type mantle component that may reflect shallow mantle recycling of a continental raft during the final breakup of Gondwana. By contrast the Sr-Nd-Pb-Hf isotopic compositions of the MBS display a strong affinity to a HIMU type mantle source. On a regional scale the isotopic signatures overlap with those from volcanics related to the West Antarctic Rift System, and Cretaceous intraplate volcanics in and off New Zealand. We propose reactivation of the HIMU material, initially accreted to the base of continental lithosphere during the pre-rifting stage of Marie Byrd Land/Zealandia to explain intraplate volcanism in the Amundsen Sea in the absence of a long-lived hotspot. We propose continental insulation flow as the most plausible mechanism to transfer the sub-continental accreted plume material into the shallow oceanic mantle. Crustal extension at the southern boundary of the Bellingshausen Plate from about 74 to 62 Ma may have triggered adiabatic rise of the HIMU material from the base of Marie Byrd Land to form the MBS. The De Gerlache Seamounts are most likely related to a preserved zone of lithospheric weakness underneath the De Gerlache Gravity Anomaly. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Marie Byrd Land Peter I Island Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Gondwana Research 25 4 1660 1679 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
New radiometric age and geochemical data of volcanic rocks from the guyot-type Marie Byrd Seamounts (MBS) and the De Gerlache Seamounts and Peter I Island (Amundsen Sea) are presented. 40Ar/39Ar ages of the shield phase of three MBS are Early Cenozoic (65 to 56 Ma) and indicate formation well after creation of the Pacific-Antarctic Ridge. A Pliocene age (3.0 Ma) documents a younger phase of volcanism at one MBS and a Pleistocene age (1.8 Ma) for the submarine base of Peter I Island. Together with published data, the new age data imply that Cenozoic intraplate magmatism occurred at distinct time intervals in spatially confined areas of the Amundsen Sea, excluding an origin through a fixed mantle plume. Peter I Island appears strongly influenced by an EMII type mantle component that may reflect shallow mantle recycling of a continental raft during the final breakup of Gondwana. By contrast the Sr-Nd-Pb-Hf isotopic compositions of the MBS display a strong affinity to a HIMU type mantle source. On a regional scale the isotopic signatures overlap with those from volcanics related to the West Antarctic Rift System, and Cretaceous intraplate volcanics in and off New Zealand. We propose reactivation of the HIMU material, initially accreted to the base of continental lithosphere during the pre-rifting stage of Marie Byrd Land/Zealandia to explain intraplate volcanism in the Amundsen Sea in the absence of a long-lived hotspot. We propose continental insulation flow as the most plausible mechanism to transfer the sub-continental accreted plume material into the shallow oceanic mantle. Crustal extension at the southern boundary of the Bellingshausen Plate from about 74 to 62 Ma may have triggered adiabatic rise of the HIMU material from the base of Marie Byrd Land to form the MBS. The De Gerlache Seamounts are most likely related to a preserved zone of lithospheric weakness underneath the De Gerlache Gravity Anomaly. |
format |
Article in Journal/Newspaper |
author |
Kipf, Andrea Hauff, Folkmar Werner, Reinhard Gohl, Karsten van den Bogaard, Paul Hoernle, Kaj Maicher, D. Klügel, A. |
spellingShingle |
Kipf, Andrea Hauff, Folkmar Werner, Reinhard Gohl, Karsten van den Bogaard, Paul Hoernle, Kaj Maicher, D. Klügel, A. Seamounts off the West Antarctic margin: A case for non-hotspot driven intraplate volcanism |
author_facet |
Kipf, Andrea Hauff, Folkmar Werner, Reinhard Gohl, Karsten van den Bogaard, Paul Hoernle, Kaj Maicher, D. Klügel, A. |
author_sort |
Kipf, Andrea |
title |
Seamounts off the West Antarctic margin: A case for non-hotspot driven intraplate volcanism |
title_short |
Seamounts off the West Antarctic margin: A case for non-hotspot driven intraplate volcanism |
title_full |
Seamounts off the West Antarctic margin: A case for non-hotspot driven intraplate volcanism |
title_fullStr |
Seamounts off the West Antarctic margin: A case for non-hotspot driven intraplate volcanism |
title_full_unstemmed |
Seamounts off the West Antarctic margin: A case for non-hotspot driven intraplate volcanism |
title_sort |
seamounts off the west antarctic margin: a case for non-hotspot driven intraplate volcanism |
publisher |
ELSEVIER SCIENCE BV |
publishDate |
2014 |
url |
https://epic.awi.de/id/eprint/33429/ https://epic.awi.de/id/eprint/33429/1/Kipf-etal_Marie-Byrd-Seamounts_GondwanaResearch_2014.pdf https://hdl.handle.net/10013/epic.42470 https://hdl.handle.net/10013/epic.42470.d001 |
genre |
Amundsen Sea Antarc* Antarctic Marie Byrd Land Peter I Island |
genre_facet |
Amundsen Sea Antarc* Antarctic Marie Byrd Land Peter I Island |
op_source |
EPIC3Gondwana Research, ELSEVIER SCIENCE BV, 25(4), pp. 1660-1679, ISSN: 1342-937X |
op_relation |
https://epic.awi.de/id/eprint/33429/1/Kipf-etal_Marie-Byrd-Seamounts_GondwanaResearch_2014.pdf https://hdl.handle.net/10013/epic.42470.d001 Kipf, A. , Hauff, F. , Werner, R. , Gohl, K. orcid:0000-0002-9558-2116 , van den Bogaard, P. , Hoernle, K. , Maicher, D. and Klügel, A. (2014) Seamounts off the West Antarctic margin: A case for non-hotspot driven intraplate volcanism , Gondwana Research, 25 (4), pp. 1660-1679 . doi:10.1016/j.gr.2013.06.013 <https://doi.org/10.1016/j.gr.2013.06.013> , hdl:10013/epic.42470 |
op_doi |
https://doi.org/10.1016/j.gr.2013.06.013 |
container_title |
Gondwana Research |
container_volume |
25 |
container_issue |
4 |
container_start_page |
1660 |
op_container_end_page |
1679 |
_version_ |
1810477203700318208 |