Origin of enriched components in the South Atlantic: Evidence from 40 Ma geochemical zonation of the Discovery Seamounts
Spatial geochemical zonation is being increasingly recognized in Pacific and Atlantic hotspot tracks and is believed to reflect zonation within plumes upwelling from the margins of the Large Low Shear Velocity Provinces (LLSVPs) at the base of Earth’s mantle. We present new 40Ar/39Ar age data for th...
Published in: | Earth and Planetary Science Letters |
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Format: | Article in Journal/Newspaper |
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Elsevier
2016
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Online Access: | https://oceanrep.geomar.de/id/eprint/31892/ https://oceanrep.geomar.de/id/eprint/31892/1/Schwindrofska_et.al_%202016_EPSL.pdf https://oceanrep.geomar.de/id/eprint/31892/2/Appendices%20A-C.pdf https://oceanrep.geomar.de/id/eprint/31892/3/Appendix%20D.xlsx https://oceanrep.geomar.de/id/eprint/31892/4/Appendix%20E.xlsx https://doi.org/10.1016/j.epsl.2016.02.041 |
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ftoceanrep:oai:oceanrep.geomar.de:31892 2023-05-15T18:21:14+02:00 Origin of enriched components in the South Atlantic: Evidence from 40 Ma geochemical zonation of the Discovery Seamounts Schwindrofska, Antje Hoernle, Kaj Hauff, Folkmar van den Bogaard, Paul Werner, Reinhard Garbe-Schönberg, Dieter 2016-05-01 text other https://oceanrep.geomar.de/id/eprint/31892/ https://oceanrep.geomar.de/id/eprint/31892/1/Schwindrofska_et.al_%202016_EPSL.pdf https://oceanrep.geomar.de/id/eprint/31892/2/Appendices%20A-C.pdf https://oceanrep.geomar.de/id/eprint/31892/3/Appendix%20D.xlsx https://oceanrep.geomar.de/id/eprint/31892/4/Appendix%20E.xlsx https://doi.org/10.1016/j.epsl.2016.02.041 en eng Elsevier https://oceanrep.geomar.de/id/eprint/31892/1/Schwindrofska_et.al_%202016_EPSL.pdf https://oceanrep.geomar.de/id/eprint/31892/2/Appendices%20A-C.pdf https://oceanrep.geomar.de/id/eprint/31892/3/Appendix%20D.xlsx https://oceanrep.geomar.de/id/eprint/31892/4/Appendix%20E.xlsx Schwindrofska, A., Hoernle, K. , Hauff, F. , van den Bogaard, P., Werner, R. and Garbe-Schönberg, D. (2016) Origin of enriched components in the South Atlantic: Evidence from 40 Ma geochemical zonation of the Discovery Seamounts. Earth and Planetary Science Letters, 441 . pp. 167-177. DOI 10.1016/j.epsl.2016.02.041 <https://doi.org/10.1016/j.epsl.2016.02.041>. doi:10.1016/j.epsl.2016.02.041 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2016 ftoceanrep https://doi.org/10.1016/j.epsl.2016.02.041 2023-04-07T15:24:35Z Spatial geochemical zonation is being increasingly recognized in Pacific and Atlantic hotspot tracks and is believed to reflect zonation within plumes upwelling from the margins of the Large Low Shear Velocity Provinces (LLSVPs) at the base of Earth’s mantle. We present new 40Ar/39Ar age data for the Discovery Rise (South Atlantic Ocean) that show an age progression in the direction of plate motion from 23Ma in the southwest to 40Ma in the northeast of the Rise, consistent with formation of the Rise above a mantle plume. The lavas have incompatible element and Sr–Nd–Pb–Hf radiogenic isotope characteristics similar to the enriched DUPAL anomaly occurring in the southern hemisphere. The northern chain of seamounts is compositionally similar to the adjacent Gough subtrack of the bilaterally-zoned Tristan–Gough hotspot track, whereas the southern chain has some of the most extreme DUPAL compositions found in South Atlantic intraplate lavas thus far. The nearby southern Mid-Atlantic Ridge, believed to interact with the Discovery hotspot, shows a similar spatial geochemical distribution, consistent with the Discovery hotspot being zoned over its entire 40Ma history. Our study implies a deep origin for the DUPAL anomaly, suggesting recycling of subcontinental lithospheric mantle (±lower crust) and oceanic crust through the lower mantle. The presence of an additional (Southern Discovery) DUPAL-like component, in addition to the Tristan and Gough/Northern Discovery components, in long-term zoned South Atlantic hotspots, points to the presence of a third lower mantle reservoir and thus is not consistent with the simple model that bilaterally-zoned plumes sample a chemically distinct LLSVP and the ambient mantle outside of the LLSVP. Article in Journal/Newspaper South Atlantic Ocean OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Gough ENVELOPE(159.367,159.367,-81.633,-81.633) Mid-Atlantic Ridge Pacific Tristan ENVELOPE(140.900,140.900,-66.735,-66.735) Earth and Planetary Science Letters 441 167 177 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Spatial geochemical zonation is being increasingly recognized in Pacific and Atlantic hotspot tracks and is believed to reflect zonation within plumes upwelling from the margins of the Large Low Shear Velocity Provinces (LLSVPs) at the base of Earth’s mantle. We present new 40Ar/39Ar age data for the Discovery Rise (South Atlantic Ocean) that show an age progression in the direction of plate motion from 23Ma in the southwest to 40Ma in the northeast of the Rise, consistent with formation of the Rise above a mantle plume. The lavas have incompatible element and Sr–Nd–Pb–Hf radiogenic isotope characteristics similar to the enriched DUPAL anomaly occurring in the southern hemisphere. The northern chain of seamounts is compositionally similar to the adjacent Gough subtrack of the bilaterally-zoned Tristan–Gough hotspot track, whereas the southern chain has some of the most extreme DUPAL compositions found in South Atlantic intraplate lavas thus far. The nearby southern Mid-Atlantic Ridge, believed to interact with the Discovery hotspot, shows a similar spatial geochemical distribution, consistent with the Discovery hotspot being zoned over its entire 40Ma history. Our study implies a deep origin for the DUPAL anomaly, suggesting recycling of subcontinental lithospheric mantle (±lower crust) and oceanic crust through the lower mantle. The presence of an additional (Southern Discovery) DUPAL-like component, in addition to the Tristan and Gough/Northern Discovery components, in long-term zoned South Atlantic hotspots, points to the presence of a third lower mantle reservoir and thus is not consistent with the simple model that bilaterally-zoned plumes sample a chemically distinct LLSVP and the ambient mantle outside of the LLSVP. |
format |
Article in Journal/Newspaper |
author |
Schwindrofska, Antje Hoernle, Kaj Hauff, Folkmar van den Bogaard, Paul Werner, Reinhard Garbe-Schönberg, Dieter |
spellingShingle |
Schwindrofska, Antje Hoernle, Kaj Hauff, Folkmar van den Bogaard, Paul Werner, Reinhard Garbe-Schönberg, Dieter Origin of enriched components in the South Atlantic: Evidence from 40 Ma geochemical zonation of the Discovery Seamounts |
author_facet |
Schwindrofska, Antje Hoernle, Kaj Hauff, Folkmar van den Bogaard, Paul Werner, Reinhard Garbe-Schönberg, Dieter |
author_sort |
Schwindrofska, Antje |
title |
Origin of enriched components in the South Atlantic: Evidence from 40 Ma geochemical zonation of the Discovery Seamounts |
title_short |
Origin of enriched components in the South Atlantic: Evidence from 40 Ma geochemical zonation of the Discovery Seamounts |
title_full |
Origin of enriched components in the South Atlantic: Evidence from 40 Ma geochemical zonation of the Discovery Seamounts |
title_fullStr |
Origin of enriched components in the South Atlantic: Evidence from 40 Ma geochemical zonation of the Discovery Seamounts |
title_full_unstemmed |
Origin of enriched components in the South Atlantic: Evidence from 40 Ma geochemical zonation of the Discovery Seamounts |
title_sort |
origin of enriched components in the south atlantic: evidence from 40 ma geochemical zonation of the discovery seamounts |
publisher |
Elsevier |
publishDate |
2016 |
url |
https://oceanrep.geomar.de/id/eprint/31892/ https://oceanrep.geomar.de/id/eprint/31892/1/Schwindrofska_et.al_%202016_EPSL.pdf https://oceanrep.geomar.de/id/eprint/31892/2/Appendices%20A-C.pdf https://oceanrep.geomar.de/id/eprint/31892/3/Appendix%20D.xlsx https://oceanrep.geomar.de/id/eprint/31892/4/Appendix%20E.xlsx https://doi.org/10.1016/j.epsl.2016.02.041 |
long_lat |
ENVELOPE(159.367,159.367,-81.633,-81.633) ENVELOPE(140.900,140.900,-66.735,-66.735) |
geographic |
Gough Mid-Atlantic Ridge Pacific Tristan |
geographic_facet |
Gough Mid-Atlantic Ridge Pacific Tristan |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
https://oceanrep.geomar.de/id/eprint/31892/1/Schwindrofska_et.al_%202016_EPSL.pdf https://oceanrep.geomar.de/id/eprint/31892/2/Appendices%20A-C.pdf https://oceanrep.geomar.de/id/eprint/31892/3/Appendix%20D.xlsx https://oceanrep.geomar.de/id/eprint/31892/4/Appendix%20E.xlsx Schwindrofska, A., Hoernle, K. , Hauff, F. , van den Bogaard, P., Werner, R. and Garbe-Schönberg, D. (2016) Origin of enriched components in the South Atlantic: Evidence from 40 Ma geochemical zonation of the Discovery Seamounts. Earth and Planetary Science Letters, 441 . pp. 167-177. DOI 10.1016/j.epsl.2016.02.041 <https://doi.org/10.1016/j.epsl.2016.02.041>. doi:10.1016/j.epsl.2016.02.041 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2016.02.041 |
container_title |
Earth and Planetary Science Letters |
container_volume |
441 |
container_start_page |
167 |
op_container_end_page |
177 |
_version_ |
1766200409318227968 |