Evidence of the proto-Iceland plume in northwestern Ireland at 42 Ma from helium isotopes

L A  Kirstein; M J  Timmerman

doi:10.1144/jgs.157.5.923

Evidence of the proto-Iceland plume in northwestern Ireland at 42 Ma from helium isotopes

L A Kirstein, M J Timmerman

School of Geosciences

Research output: Contribution to journal › Article › peer-review

Abstract

Combined K Ar and Ar-Ar dating of a xenolith-bearing alkaline dyke, previously considered to be of late Palaeozoic age, suggest a mid-Eocene age of c. 43 Ma, indicating that it is part of extensive rift-related Tertiary intrusive activity. High He-3/He-4 ratios of 11-16R(a), potentially up to 23R(a) (R-a=atmospheric ratio of 1.39 x 10(-6)) have been measured from mantle xenoliths in the dyke and are consistent with previous determinations of the helium isotope composition of Tertiary lavas in Greenland and Scotland linking the magmatism with the proto-Iceland mantle plume.

Original language	English
Pages (from-to)	923-927
Number of pages	5
Journal	Journal of the Geological Society
Volume	157
Issue number	5
DOIs	https://doi.org/10.1144/jgs.157.5.923
Publication status	Published - Sept 2000

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title = "Evidence of the proto-Iceland plume in northwestern Ireland at 42 Ma from helium isotopes",

abstract = "Combined K Ar and Ar-Ar dating of a xenolith-bearing alkaline dyke, previously considered to be of late Palaeozoic age, suggest a mid-Eocene age of c. 43 Ma, indicating that it is part of extensive rift-related Tertiary intrusive activity. High He-3/He-4 ratios of 11-16R(a), potentially up to 23R(a) (R-a=atmospheric ratio of 1.39 x 10(-6)) have been measured from mantle xenoliths in the dyke and are consistent with previous determinations of the helium isotope composition of Tertiary lavas in Greenland and Scotland linking the magmatism with the proto-Iceland mantle plume.",

author = "Kirstein, {L A} and Timmerman, {M J}",

year = "2000",

month = sep,

doi = "10.1144/jgs.157.5.923",

language = "English",

volume = "157",

pages = "923--927",

journal = "Journal of the Geological Society",

issn = "0016-7649",

publisher = "Geological Society of London",

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T1 - Evidence of the proto-Iceland plume in northwestern Ireland at 42 Ma from helium isotopes

AU - Kirstein, L A

AU - Timmerman, M J

PY - 2000/9

Y1 - 2000/9

N2 - Combined K Ar and Ar-Ar dating of a xenolith-bearing alkaline dyke, previously considered to be of late Palaeozoic age, suggest a mid-Eocene age of c. 43 Ma, indicating that it is part of extensive rift-related Tertiary intrusive activity. High He-3/He-4 ratios of 11-16R(a), potentially up to 23R(a) (R-a=atmospheric ratio of 1.39 x 10(-6)) have been measured from mantle xenoliths in the dyke and are consistent with previous determinations of the helium isotope composition of Tertiary lavas in Greenland and Scotland linking the magmatism with the proto-Iceland mantle plume.

AB - Combined K Ar and Ar-Ar dating of a xenolith-bearing alkaline dyke, previously considered to be of late Palaeozoic age, suggest a mid-Eocene age of c. 43 Ma, indicating that it is part of extensive rift-related Tertiary intrusive activity. High He-3/He-4 ratios of 11-16R(a), potentially up to 23R(a) (R-a=atmospheric ratio of 1.39 x 10(-6)) have been measured from mantle xenoliths in the dyke and are consistent with previous determinations of the helium isotope composition of Tertiary lavas in Greenland and Scotland linking the magmatism with the proto-Iceland mantle plume.

U2 - 10.1144/jgs.157.5.923

DO - 10.1144/jgs.157.5.923

M3 - Article

SN - 0016-7649

VL - 157

SP - 923

EP - 927

JO - Journal of the Geological Society

JF - Journal of the Geological Society

IS - 5

ER -

Evidence of the proto-Iceland plume in northwestern Ireland at 42 Ma from helium isotopes

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