Melt, fluid and crystal inclusions in olivine phenocrysts from Kerguelen plume-derived pictric basalts: Evidence for interaction with the Kerguelen Plateau lithosphere
Melt, fluid and crystal inclusions have been studied in olivine phenocrysts from a suite of picritic basalts dredged during the "Marion Dufresne" MD 109 cruise (Dredge 6) from a seamount located between the Kerguelen Archipelago and Heard Island (Southern Indian Ocean). A two-stage polybar...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/183978 2023-05-15T16:33:57+02:00 Melt, fluid and crystal inclusions in olivine phenocrysts from Kerguelen plume-derived pictric basalts: Evidence for interaction with the Kerguelen Plateau lithosphere Borisova, Anastassia Yu Nikogosian, Igor I.K. Scoates, James Weis, Dominique Damascene, Dimitri Shimizu, Nobumichi Touret, Jacques L R 2002 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/183978 https://dipot.ulb.ac.be/dspace/bitstream/2013/183978/1/Elsevier_167605.pdf en eng uri/info:doi/10.1016/S0009-2541(01)00377-1 uri/info:pii/S0009254101003771 uri/info:scp/0036208613 https://dipot.ulb.ac.be/dspace/bitstream/2013/183978/1/Elsevier_167605.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/183978 1 full-text file(s): info:eu-repo/semantics/restrictedAccess Chemical geology, 183 (1-4 Géologie Pétrologie Géochimie Fluid and crystal inclusions Kerguelen plateau lithosphere Kerguelen plume Melt Pictric basalt Polybaric crystallisation Two-component mixing info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2002 ftunivbruxelles 2022-06-12T21:02:53Z Melt, fluid and crystal inclusions have been studied in olivine phenocrysts from a suite of picritic basalts dredged during the "Marion Dufresne" MD 109 cruise (Dredge 6) from a seamount located between the Kerguelen Archipelago and Heard Island (Southern Indian Ocean). A two-stage polybaric crystallisation of the trapped melt is indicated by compositions of the host olivine+spinel assemblage and by the density of coexisting fluid inclusions. The melt trapped in early olivine phenocrysts (Fo82-85.5) crystallised under pressures from 2 to 4 kbar, whereas the melt trapped in late olivine phenocrysts (Fo78.7-80) crystallised at shallower depths (<1 kbar). There is a wide range of incompatible elements in the homogenised melt inclusions (P2O5=0.4-1.6 wt.%, K2O=1.4-2.4 wt.%) at a relatively restricted MgO content (7.0-9.6 wt.%). The small amounts of P2O5-rich melt trapped in the early olivine phenocrysts are remarkably similar to the contemporaneous basalt suite (Dredge 5) from the same seamount. The chemistry of the host dredge 6 basalts requires a significant contribution (more than 80%) of richer in K2O and poorer in P2O5 subalkaline melt (K2O>2.5 wt%, P2O5<0.34 wt.%). The contribution of such subalkaline melt with slightly unradiogenic Pb - Nd isotope ratios and major and trace element composition, similar to the low 206Pb/204Pb-143Nd/144Nd trachybasaltic suite of the Aphanasey Nikitin Rise, may explain the striking Nb-Ta depletion, Pb enrichment and isotopic compositions of the dredge 6 basalts. The petrogenesis of the picritic basalts from dredge 6 is controlled by two-component mixing between a P2O5-rich Kerguelen plume-derived melt and a subalkaline melt derived from the Kerguelen Plateau lithosphere and provides more evidence for the involvement of low 206Pb/204Pb-143Nd/144Nd lithosphere material into young Kerguelen plume-derived basaltic magmas. © 2002 Elsevier Science B.V. All rights reserved. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Heard Island DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Heard Island Indian Kerguelen |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Géologie Pétrologie Géochimie Fluid and crystal inclusions Kerguelen plateau lithosphere Kerguelen plume Melt Pictric basalt Polybaric crystallisation Two-component mixing |
spellingShingle |
Géologie Pétrologie Géochimie Fluid and crystal inclusions Kerguelen plateau lithosphere Kerguelen plume Melt Pictric basalt Polybaric crystallisation Two-component mixing Borisova, Anastassia Yu Nikogosian, Igor I.K. Scoates, James Weis, Dominique Damascene, Dimitri Shimizu, Nobumichi Touret, Jacques L R Melt, fluid and crystal inclusions in olivine phenocrysts from Kerguelen plume-derived pictric basalts: Evidence for interaction with the Kerguelen Plateau lithosphere |
topic_facet |
Géologie Pétrologie Géochimie Fluid and crystal inclusions Kerguelen plateau lithosphere Kerguelen plume Melt Pictric basalt Polybaric crystallisation Two-component mixing |
description |
Melt, fluid and crystal inclusions have been studied in olivine phenocrysts from a suite of picritic basalts dredged during the "Marion Dufresne" MD 109 cruise (Dredge 6) from a seamount located between the Kerguelen Archipelago and Heard Island (Southern Indian Ocean). A two-stage polybaric crystallisation of the trapped melt is indicated by compositions of the host olivine+spinel assemblage and by the density of coexisting fluid inclusions. The melt trapped in early olivine phenocrysts (Fo82-85.5) crystallised under pressures from 2 to 4 kbar, whereas the melt trapped in late olivine phenocrysts (Fo78.7-80) crystallised at shallower depths (<1 kbar). There is a wide range of incompatible elements in the homogenised melt inclusions (P2O5=0.4-1.6 wt.%, K2O=1.4-2.4 wt.%) at a relatively restricted MgO content (7.0-9.6 wt.%). The small amounts of P2O5-rich melt trapped in the early olivine phenocrysts are remarkably similar to the contemporaneous basalt suite (Dredge 5) from the same seamount. The chemistry of the host dredge 6 basalts requires a significant contribution (more than 80%) of richer in K2O and poorer in P2O5 subalkaline melt (K2O>2.5 wt%, P2O5<0.34 wt.%). The contribution of such subalkaline melt with slightly unradiogenic Pb - Nd isotope ratios and major and trace element composition, similar to the low 206Pb/204Pb-143Nd/144Nd trachybasaltic suite of the Aphanasey Nikitin Rise, may explain the striking Nb-Ta depletion, Pb enrichment and isotopic compositions of the dredge 6 basalts. The petrogenesis of the picritic basalts from dredge 6 is controlled by two-component mixing between a P2O5-rich Kerguelen plume-derived melt and a subalkaline melt derived from the Kerguelen Plateau lithosphere and provides more evidence for the involvement of low 206Pb/204Pb-143Nd/144Nd lithosphere material into young Kerguelen plume-derived basaltic magmas. © 2002 Elsevier Science B.V. All rights reserved. SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Borisova, Anastassia Yu Nikogosian, Igor I.K. Scoates, James Weis, Dominique Damascene, Dimitri Shimizu, Nobumichi Touret, Jacques L R |
author_facet |
Borisova, Anastassia Yu Nikogosian, Igor I.K. Scoates, James Weis, Dominique Damascene, Dimitri Shimizu, Nobumichi Touret, Jacques L R |
author_sort |
Borisova, Anastassia Yu |
title |
Melt, fluid and crystal inclusions in olivine phenocrysts from Kerguelen plume-derived pictric basalts: Evidence for interaction with the Kerguelen Plateau lithosphere |
title_short |
Melt, fluid and crystal inclusions in olivine phenocrysts from Kerguelen plume-derived pictric basalts: Evidence for interaction with the Kerguelen Plateau lithosphere |
title_full |
Melt, fluid and crystal inclusions in olivine phenocrysts from Kerguelen plume-derived pictric basalts: Evidence for interaction with the Kerguelen Plateau lithosphere |
title_fullStr |
Melt, fluid and crystal inclusions in olivine phenocrysts from Kerguelen plume-derived pictric basalts: Evidence for interaction with the Kerguelen Plateau lithosphere |
title_full_unstemmed |
Melt, fluid and crystal inclusions in olivine phenocrysts from Kerguelen plume-derived pictric basalts: Evidence for interaction with the Kerguelen Plateau lithosphere |
title_sort |
melt, fluid and crystal inclusions in olivine phenocrysts from kerguelen plume-derived pictric basalts: evidence for interaction with the kerguelen plateau lithosphere |
publishDate |
2002 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/183978 https://dipot.ulb.ac.be/dspace/bitstream/2013/183978/1/Elsevier_167605.pdf |
geographic |
Heard Island Indian Kerguelen |
geographic_facet |
Heard Island Indian Kerguelen |
genre |
Heard Island |
genre_facet |
Heard Island |
op_source |
Chemical geology, 183 (1-4 |
op_relation |
uri/info:doi/10.1016/S0009-2541(01)00377-1 uri/info:pii/S0009254101003771 uri/info:scp/0036208613 https://dipot.ulb.ac.be/dspace/bitstream/2013/183978/1/Elsevier_167605.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/183978 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/restrictedAccess |
_version_ |
1766023690452992000 |