40Ar/39Ar geochronology of flood basalts from the Kerguelen Archipelago, southern Indian Ocean: Implications for Cenozoic eruption rates of the Kerguelen plume
The 6500 km2 Kerguelen Archipelago formed on the nothern Kerguelen Plateau (NKP) (4 X 105 km2) which is a shallow submarine plateau belonging to the Kerguelen large igneous province in the southern Indian Ocean. Flood basalts make up 85% of the archipelago and are interpreted as the most recent volc...
Main Authors: | , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2000
|
Subjects: | |
Online Access: | http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/181027 https://dipot.ulb.ac.be/dspace/bitstream/2013/181027/1/Elsevier_164654.pdf |
id |
ftunivbruxelles:oai:dipot.ulb.ac.be:2013/181027 |
---|---|
record_format |
openpolar |
spelling |
ftunivbruxelles:oai:dipot.ulb.ac.be:2013/181027 2023-05-15T17:02:09+02:00 40Ar/39Ar geochronology of flood basalts from the Kerguelen Archipelago, southern Indian Ocean: Implications for Cenozoic eruption rates of the Kerguelen plume Nicolaysen, Kirsten Frey, Frederic A Hodges, Kip K.V. Weis, Dominique Giret, André 2000-01 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/181027 https://dipot.ulb.ac.be/dspace/bitstream/2013/181027/1/Elsevier_164654.pdf en eng uri/info:doi/10.1016/S0012-821X(99)00271-X uri/info:pii/S0012821X9900271X uri/info:scp/0034651120 https://dipot.ulb.ac.be/dspace/bitstream/2013/181027/1/Elsevier_164654.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/181027 1 full-text file(s): info:eu-repo/semantics/restrictedAccess Earth and planetary science letters, 174 (3-4 Sciences de l'espace Géographie physique Pétrologie Géochimie Sciences de la terre et du cosmos Absolute age Ar-40/Ar-39 Eruptions Hot spots Kerguelen Islands Mid-ocean ridges info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2000 ftunivbruxelles 2022-06-12T21:02:20Z The 6500 km2 Kerguelen Archipelago formed on the nothern Kerguelen Plateau (NKP) (4 X 105 km2) which is a shallow submarine plateau belonging to the Kerguelen large igneous province in the southern Indian Ocean. Flood basalts make up 85% of the archipelago and are interpreted as the most recent volcanism ( < 40 Ma) from the Kerguelen hotspot which has erupted basalt for the last 115 million years. Based on 40AR/39Ar incremental heating of acid-leached groundmass separates, we report isochron ages ranging from 29.26 ± 0.87 Ma to 24.53 ± 0.29 Ma for 15 basalts from five stratigraphic sections from diverse regions of the archipelago. The oldest dated basalt from the archipelago (~ 29 Ma) is much younger than the ~ 40 Ma age of conjunction between the hotspot and the Southeast Indian Ridge. Basalt eruption seems to have ceased shortly after ~ 24 Ma although small volume, highly evolved lavas and plutons continued to form in the archipelago. The basalt age data suggest an average lava accumulation rate of ~ 1.6±0.9 km/my during the Oligocene. The archipelago's volumetric eruption rate (0.009 km3/yr) is lower than estimates made for the Cretaceous Kerguelen Plateau (1.7 km3/yr) and the Ninetyeast Ridge hotspot track (0.18 km3/yr), suggesting that the late Cenozoic extrusive activity of the Kerguelen plume is waning. Cenozoic volcanism attributed to the Kerguelen plume occurs over a diffuse area with Quaternary eruptions at Heard and McDonald Islands and within the Kerguelen Archipelago. The decreasing eruption rate and areally diffuse volcanism may be explained by the thick lithosphere of the Cretaceous Kerguelen Plateau overriding and insulating the plume. However, if the undated NKP, which underlies the archipelago, formed during the Cenozoic, then, the crustal production rate of the plume from 40 Ma to the present (~ 0.25 km3/yr) would be similar to the crustal production rate (0.23 km3/my) previously estimated for the formation of the Ninetyeast Ridge (~ 82-38 Ma). SCOPUS: ar.j ... Article in Journal/Newspaper Kerguelen Islands McDonald Islands DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Heard ENVELOPE(73.510,73.510,-53.117,-53.117) Indian Kerguelen Kerguelen Islands McDonald Islands ENVELOPE(72.600,72.600,-53.033,-53.033) Southeast Indian Ridge ENVELOPE(110.000,110.000,-50.000,-50.000) |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Sciences de l'espace Géographie physique Pétrologie Géochimie Sciences de la terre et du cosmos Absolute age Ar-40/Ar-39 Eruptions Hot spots Kerguelen Islands Mid-ocean ridges |
spellingShingle |
Sciences de l'espace Géographie physique Pétrologie Géochimie Sciences de la terre et du cosmos Absolute age Ar-40/Ar-39 Eruptions Hot spots Kerguelen Islands Mid-ocean ridges Nicolaysen, Kirsten Frey, Frederic A Hodges, Kip K.V. Weis, Dominique Giret, André 40Ar/39Ar geochronology of flood basalts from the Kerguelen Archipelago, southern Indian Ocean: Implications for Cenozoic eruption rates of the Kerguelen plume |
topic_facet |
Sciences de l'espace Géographie physique Pétrologie Géochimie Sciences de la terre et du cosmos Absolute age Ar-40/Ar-39 Eruptions Hot spots Kerguelen Islands Mid-ocean ridges |
description |
The 6500 km2 Kerguelen Archipelago formed on the nothern Kerguelen Plateau (NKP) (4 X 105 km2) which is a shallow submarine plateau belonging to the Kerguelen large igneous province in the southern Indian Ocean. Flood basalts make up 85% of the archipelago and are interpreted as the most recent volcanism ( < 40 Ma) from the Kerguelen hotspot which has erupted basalt for the last 115 million years. Based on 40AR/39Ar incremental heating of acid-leached groundmass separates, we report isochron ages ranging from 29.26 ± 0.87 Ma to 24.53 ± 0.29 Ma for 15 basalts from five stratigraphic sections from diverse regions of the archipelago. The oldest dated basalt from the archipelago (~ 29 Ma) is much younger than the ~ 40 Ma age of conjunction between the hotspot and the Southeast Indian Ridge. Basalt eruption seems to have ceased shortly after ~ 24 Ma although small volume, highly evolved lavas and plutons continued to form in the archipelago. The basalt age data suggest an average lava accumulation rate of ~ 1.6±0.9 km/my during the Oligocene. The archipelago's volumetric eruption rate (0.009 km3/yr) is lower than estimates made for the Cretaceous Kerguelen Plateau (1.7 km3/yr) and the Ninetyeast Ridge hotspot track (0.18 km3/yr), suggesting that the late Cenozoic extrusive activity of the Kerguelen plume is waning. Cenozoic volcanism attributed to the Kerguelen plume occurs over a diffuse area with Quaternary eruptions at Heard and McDonald Islands and within the Kerguelen Archipelago. The decreasing eruption rate and areally diffuse volcanism may be explained by the thick lithosphere of the Cretaceous Kerguelen Plateau overriding and insulating the plume. However, if the undated NKP, which underlies the archipelago, formed during the Cenozoic, then, the crustal production rate of the plume from 40 Ma to the present (~ 0.25 km3/yr) would be similar to the crustal production rate (0.23 km3/my) previously estimated for the formation of the Ninetyeast Ridge (~ 82-38 Ma). SCOPUS: ar.j ... |
format |
Article in Journal/Newspaper |
author |
Nicolaysen, Kirsten Frey, Frederic A Hodges, Kip K.V. Weis, Dominique Giret, André |
author_facet |
Nicolaysen, Kirsten Frey, Frederic A Hodges, Kip K.V. Weis, Dominique Giret, André |
author_sort |
Nicolaysen, Kirsten |
title |
40Ar/39Ar geochronology of flood basalts from the Kerguelen Archipelago, southern Indian Ocean: Implications for Cenozoic eruption rates of the Kerguelen plume |
title_short |
40Ar/39Ar geochronology of flood basalts from the Kerguelen Archipelago, southern Indian Ocean: Implications for Cenozoic eruption rates of the Kerguelen plume |
title_full |
40Ar/39Ar geochronology of flood basalts from the Kerguelen Archipelago, southern Indian Ocean: Implications for Cenozoic eruption rates of the Kerguelen plume |
title_fullStr |
40Ar/39Ar geochronology of flood basalts from the Kerguelen Archipelago, southern Indian Ocean: Implications for Cenozoic eruption rates of the Kerguelen plume |
title_full_unstemmed |
40Ar/39Ar geochronology of flood basalts from the Kerguelen Archipelago, southern Indian Ocean: Implications for Cenozoic eruption rates of the Kerguelen plume |
title_sort |
40ar/39ar geochronology of flood basalts from the kerguelen archipelago, southern indian ocean: implications for cenozoic eruption rates of the kerguelen plume |
publishDate |
2000 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/181027 https://dipot.ulb.ac.be/dspace/bitstream/2013/181027/1/Elsevier_164654.pdf |
long_lat |
ENVELOPE(73.510,73.510,-53.117,-53.117) ENVELOPE(72.600,72.600,-53.033,-53.033) ENVELOPE(110.000,110.000,-50.000,-50.000) |
geographic |
Heard Indian Kerguelen Kerguelen Islands McDonald Islands Southeast Indian Ridge |
geographic_facet |
Heard Indian Kerguelen Kerguelen Islands McDonald Islands Southeast Indian Ridge |
genre |
Kerguelen Islands McDonald Islands |
genre_facet |
Kerguelen Islands McDonald Islands |
op_source |
Earth and planetary science letters, 174 (3-4 |
op_relation |
uri/info:doi/10.1016/S0012-821X(99)00271-X uri/info:pii/S0012821X9900271X uri/info:scp/0034651120 https://dipot.ulb.ac.be/dspace/bitstream/2013/181027/1/Elsevier_164654.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/181027 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/restrictedAccess |
_version_ |
1766055402017914880 |