Major Element Records of Variable Plume Involvement in the North Atlantic Province Tertiary Flood Basalts
Major element variations in North Atlantic Tertiary Province primitive, early erupted, alkaline-transitional-tholeiite basalts, recalculated to a restricted value of MgO, give insights into the process of plume-related magmatism. Basalts primitive enough to be crystallizing only olivine were recalcu...
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fthighwire:oai:open-archive.highwire.org:petrology:41/7/1155 2023-05-15T16:03:51+02:00 Major Element Records of Variable Plume Involvement in the North Atlantic Province Tertiary Flood Basalts SCARROW, J. H. CURRAN, J. M. KERR, A. C. 2000-07-01 00:00:00.0 text/html http://petrology.oxfordjournals.org/cgi/content/short/41/7/1155 https://doi.org/10.1093/petrology/41.7.1155 en eng Oxford University Press http://petrology.oxfordjournals.org/cgi/content/short/41/7/1155 http://dx.doi.org/10.1093/petrology/41.7.1155 Copyright (C) 2000, Oxford University Press ARTICLES TEXT 2000 fthighwire https://doi.org/10.1093/petrology/41.7.1155 2013-05-27T17:07:38Z Major element variations in North Atlantic Tertiary Province primitive, early erupted, alkaline-transitional-tholeiite basalts, recalculated to a restricted value of MgO, give insights into the process of plume-related magmatism. Basalts primitive enough to be crystallizing only olivine were recalculated to a proposed primary magma composition of 15 wt % MgO. The recalculated dataset shows clear inter-element correlations including a strong, significant, negative correlation between Fe and Si indicating polybaric melt segregation. Overlap between basalt compositions and experimental melts from a fertile, Fe-rich, low <rm>mg</rm>-number (85.5) peridotite suggests that, relative to normal peridotite with <rm>mg</rm>-number > 89, the North Atlantic basalt source was Fe rich. Linear regression of the experimental data gives apparent pressures of magma segregation of 17·5–37 kbar, with intra-region variability in the depth derivation from the melt column for each sample, thus suggesting that lithospheric thickness ‘lid-effect’ control on magma generation may have been overemphasized in recent studies. Comparable source composition, magma segregation depth and calculated mantle potential temperature (1440–1460°C) throughout the Province supports the previously suggested plume impact model, arriving below East Greenland, derived from a variably enriched and depleted lower-mantle source. Given the good agreement between conclusions drawn from major element data and previously published results we suggest that restricted-MgO recalculated datasets may be usefully applied to study other large igneous provinces. Text East Greenland Greenland North Atlantic HighWire Press (Stanford University) Greenland Journal of Petrology 41 7 1155 1176 |
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HighWire Press (Stanford University) |
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fthighwire |
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English |
topic |
ARTICLES |
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ARTICLES SCARROW, J. H. CURRAN, J. M. KERR, A. C. Major Element Records of Variable Plume Involvement in the North Atlantic Province Tertiary Flood Basalts |
topic_facet |
ARTICLES |
description |
Major element variations in North Atlantic Tertiary Province primitive, early erupted, alkaline-transitional-tholeiite basalts, recalculated to a restricted value of MgO, give insights into the process of plume-related magmatism. Basalts primitive enough to be crystallizing only olivine were recalculated to a proposed primary magma composition of 15 wt % MgO. The recalculated dataset shows clear inter-element correlations including a strong, significant, negative correlation between Fe and Si indicating polybaric melt segregation. Overlap between basalt compositions and experimental melts from a fertile, Fe-rich, low <rm>mg</rm>-number (85.5) peridotite suggests that, relative to normal peridotite with <rm>mg</rm>-number > 89, the North Atlantic basalt source was Fe rich. Linear regression of the experimental data gives apparent pressures of magma segregation of 17·5–37 kbar, with intra-region variability in the depth derivation from the melt column for each sample, thus suggesting that lithospheric thickness ‘lid-effect’ control on magma generation may have been overemphasized in recent studies. Comparable source composition, magma segregation depth and calculated mantle potential temperature (1440–1460°C) throughout the Province supports the previously suggested plume impact model, arriving below East Greenland, derived from a variably enriched and depleted lower-mantle source. Given the good agreement between conclusions drawn from major element data and previously published results we suggest that restricted-MgO recalculated datasets may be usefully applied to study other large igneous provinces. |
format |
Text |
author |
SCARROW, J. H. CURRAN, J. M. KERR, A. C. |
author_facet |
SCARROW, J. H. CURRAN, J. M. KERR, A. C. |
author_sort |
SCARROW, J. H. |
title |
Major Element Records of Variable Plume Involvement in the North Atlantic Province Tertiary Flood Basalts |
title_short |
Major Element Records of Variable Plume Involvement in the North Atlantic Province Tertiary Flood Basalts |
title_full |
Major Element Records of Variable Plume Involvement in the North Atlantic Province Tertiary Flood Basalts |
title_fullStr |
Major Element Records of Variable Plume Involvement in the North Atlantic Province Tertiary Flood Basalts |
title_full_unstemmed |
Major Element Records of Variable Plume Involvement in the North Atlantic Province Tertiary Flood Basalts |
title_sort |
major element records of variable plume involvement in the north atlantic province tertiary flood basalts |
publisher |
Oxford University Press |
publishDate |
2000 |
url |
http://petrology.oxfordjournals.org/cgi/content/short/41/7/1155 https://doi.org/10.1093/petrology/41.7.1155 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland Greenland North Atlantic |
genre_facet |
East Greenland Greenland North Atlantic |
op_relation |
http://petrology.oxfordjournals.org/cgi/content/short/41/7/1155 http://dx.doi.org/10.1093/petrology/41.7.1155 |
op_rights |
Copyright (C) 2000, Oxford University Press |
op_doi |
https://doi.org/10.1093/petrology/41.7.1155 |
container_title |
Journal of Petrology |
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41 |
container_issue |
7 |
container_start_page |
1155 |
op_container_end_page |
1176 |
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1766399547379023872 |