Post-breakup basaltic magmatism along the East Greenland Tertiary rifted margin
Mafic and ultramafic intrusions in East Greenland adjacent to the offshore Greenland–Iceland ridge were emplaced 5–9 My after continental breakup at 55 Ma [1]. Rare earth element (REE) concentrations determined by secondary ion mass spectrometry are reported for cumulus clinopyroxene from these intr...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.523.8736 2023-05-15T16:03:33+02:00 Post-breakup basaltic magmatism along the East Greenland Tertiary rifted margin Stefan Bernstein A Peter B. Kelemen B Christian Tegner C Mark D. Kurz D Jurek Blusztajn E C. Kent Brooks F The Pennsylvania State University CiteSeerX Archives 1998 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.523.8736 http://www.ldeo.columbia.edu/files/uploaded/file/1998 Bernstein et al Greenland.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.523.8736 http://www.ldeo.columbia.edu/files/uploaded/file/1998 Bernstein et al Greenland.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.ldeo.columbia.edu/files/uploaded/file/1998 Bernstein et al Greenland.pdf text 1998 ftciteseerx 2016-01-08T10:16:04Z Mafic and ultramafic intrusions in East Greenland adjacent to the offshore Greenland–Iceland ridge were emplaced 5–9 My after continental breakup at 55 Ma [1]. Rare earth element (REE) concentrations determined by secondary ion mass spectrometry are reported for cumulus clinopyroxene from these intrusions, and the data are used to estimate REE abundance in equilibrium melts using available partitioning data. Estimated equilibrium melts from intrusions have strongly fractionated REE patterns with Nd=Dy(N) in the range 2 to 5.6 and Yb=Dy(N) 0.55 to 0.92, similar to values for coeval basalts. These melts have markedly higher Nd=Dy(N) than earlier breakup related flood basalts. The moderately low Yb=Dy(N) for the post-breakup volcanism is indicative of residual garnet in the source, while their high Nd=Dy(N) ratios can best be explained by aggregating low degree melts from a light-REE-enriched garnet- and spinel-bearing mantle source. We also report He, Sr, and Nd isotopic data for the intrusions. The highest 3He=4He ratios (>10 R=Ra) are found in the samples whose REE data reflect the largest proportion of melts from a garnet-bearing source, and having Sr and Nd isotopic compositions identical with the radiogenic Sr and unradiogenic Nd isotope end of the Iceland compositional field. There is no indication of a MORB-type mantle in the source of the intrusions. We postulate that post-breakup volcanism along the East Greenland coastline reflects the increasing proximity of the mantle plume to the East Greenland continental margin. The low degree of melting at high mean pressure inferred for the parental melts for the intrusions may reflect Text East Greenland Greenland Iceland Unknown Dy ENVELOPE(11.369,11.369,64.834,64.834) Greenland |
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Open Polar |
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Unknown |
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ftciteseerx |
language |
English |
description |
Mafic and ultramafic intrusions in East Greenland adjacent to the offshore Greenland–Iceland ridge were emplaced 5–9 My after continental breakup at 55 Ma [1]. Rare earth element (REE) concentrations determined by secondary ion mass spectrometry are reported for cumulus clinopyroxene from these intrusions, and the data are used to estimate REE abundance in equilibrium melts using available partitioning data. Estimated equilibrium melts from intrusions have strongly fractionated REE patterns with Nd=Dy(N) in the range 2 to 5.6 and Yb=Dy(N) 0.55 to 0.92, similar to values for coeval basalts. These melts have markedly higher Nd=Dy(N) than earlier breakup related flood basalts. The moderately low Yb=Dy(N) for the post-breakup volcanism is indicative of residual garnet in the source, while their high Nd=Dy(N) ratios can best be explained by aggregating low degree melts from a light-REE-enriched garnet- and spinel-bearing mantle source. We also report He, Sr, and Nd isotopic data for the intrusions. The highest 3He=4He ratios (>10 R=Ra) are found in the samples whose REE data reflect the largest proportion of melts from a garnet-bearing source, and having Sr and Nd isotopic compositions identical with the radiogenic Sr and unradiogenic Nd isotope end of the Iceland compositional field. There is no indication of a MORB-type mantle in the source of the intrusions. We postulate that post-breakup volcanism along the East Greenland coastline reflects the increasing proximity of the mantle plume to the East Greenland continental margin. The low degree of melting at high mean pressure inferred for the parental melts for the intrusions may reflect |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Stefan Bernstein A Peter B. Kelemen B Christian Tegner C Mark D. Kurz D Jurek Blusztajn E C. Kent Brooks F |
spellingShingle |
Stefan Bernstein A Peter B. Kelemen B Christian Tegner C Mark D. Kurz D Jurek Blusztajn E C. Kent Brooks F Post-breakup basaltic magmatism along the East Greenland Tertiary rifted margin |
author_facet |
Stefan Bernstein A Peter B. Kelemen B Christian Tegner C Mark D. Kurz D Jurek Blusztajn E C. Kent Brooks F |
author_sort |
Stefan Bernstein A |
title |
Post-breakup basaltic magmatism along the East Greenland Tertiary rifted margin |
title_short |
Post-breakup basaltic magmatism along the East Greenland Tertiary rifted margin |
title_full |
Post-breakup basaltic magmatism along the East Greenland Tertiary rifted margin |
title_fullStr |
Post-breakup basaltic magmatism along the East Greenland Tertiary rifted margin |
title_full_unstemmed |
Post-breakup basaltic magmatism along the East Greenland Tertiary rifted margin |
title_sort |
post-breakup basaltic magmatism along the east greenland tertiary rifted margin |
publishDate |
1998 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.523.8736 http://www.ldeo.columbia.edu/files/uploaded/file/1998 Bernstein et al Greenland.pdf |
long_lat |
ENVELOPE(11.369,11.369,64.834,64.834) |
geographic |
Dy Greenland |
geographic_facet |
Dy Greenland |
genre |
East Greenland Greenland Iceland |
genre_facet |
East Greenland Greenland Iceland |
op_source |
http://www.ldeo.columbia.edu/files/uploaded/file/1998 Bernstein et al Greenland.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.523.8736 http://www.ldeo.columbia.edu/files/uploaded/file/1998 Bernstein et al Greenland.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766399227451146240 |