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Interpretation of Nd, Sr and Pb isotope data from Archean migmatites in Lofoten-Vesterålen, Norway

Jacobsen, Stein B. and Wasserburg, G. J. (1978) Interpretation of Nd, Sr and Pb isotope data from Archean migmatites in Lofoten-Vesterålen, Norway. Earth and Planetary Science Letters, 41 (3). pp. 245-253. ISSN 0012-821X. doi:10.1016/0012-821X(78)90181-4.

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Sm-Nd data for the Archean granulite and amphibolite facies migmatites of Langøy and Hinnøy in Vesterålen are presented which indicate that their protoliths formed ∼2.6 AE ago. Rubidium and U loss during a granulite facies metamorphism at ∼1.8 AE caused serious disturbance of total-rock U-Pb and Rb-Sr systems. Therefore these systems do not provide any precise age information for the granulite facies migmatites. For the amphibolite facies migmatites of Vesterålen both Sm-Nd, Rb-Sr and Pb-Pb total-rock systems give model ages of ∼2.6 AE. The results on both granulite and amphibolite facies rocks are thus in agreement. Previous interpretations based on Pb-Pb data, which indicated an age of 3.41 AE for the Archean terrane of Vesterålen, are not valid. One Sm-Nd model age from the granulite facies migmatites at Moskenesøy in Lofoten indicates that the protoliths of these migmatites formed ∼2.0 AE ago and are thus not related to the Vesterålen migmatites.

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Wasserburg, G. J.0000-0002-7957-8029
Additional Information:© 1978 Elsevier Scientific Publishing Company. Received May 16, 1978. Revised version received July 25, 1978. Einar Tveten of the Norwegian Geological Survey (NGU) was most helpful in assisting us with the fieldwork and discussing the field relations in Vesterålen. We also appreciate the patience of his wife Laila and her younger assistant. We are grateful to K.S. Heier and W.L. Griffin for discussions and for making some of the arrangements for us to go there. Samples GS-5, GS-23 and TL-39 were supplied by I.K. Iden who also kindly made unpublished REE data available to us as a guidance for sample selection. Some of the Sm-Nd results and our interpretation of the U-Pb and Rb-Sr systematics were first presented in a seminar at the Mineralogical-Geological Museum in Oslo, August 1977, and we appreciate the discussion with W.L. Griffin and coworkers on that occasion. After this work was completed, we received from W.L. Griffin a revised preprint of [8] that reports the new Pb-Pb age by P.N. Taylor for the amphibolite facies migmatites and a revision of the Lofoten-Vester3len chronology, which now agrees in outline with that suggested here. One of us (S.B.J.) would like to thank K.S. Heier and P.N. Taylor for generating his interest in this and other problems concerning the nature of the lower crust. S.B.J. also thanks D.J. DePaolo, D.A. Papanastassiou and M.T. McCulloch for assistance and advice with the chemical and mass spectrometric procedures. F. Oberli and M.T. McCulloch provided constructive criticism of the manuscript. This paper has benefited from the reviews by P.N. Taylor, R.K. O'Nions and an anonymous reviewer. The first part of this work was done while the senior author held a Rotary Foundation Fellowship. This work has been supported by NSF grant EAR 76-22494.
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NSFEAR 76-22494
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Caltech Division of Geological and Planetary Sciences3094
Lunatic Asylum Lab274
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Official Citation:Stein B. Jacobsen, G.J. Wasserburg, Interpretation of Nd, Sr and Pb isotope data from Archean migmatites in Lofoten-Vesterålen, Norway, Earth and Planetary Science Letters, Volume 41, Issue 3, November 1978, Pages 245-253, ISSN 0012-821X, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42083
Deposited By: Ruth Sustaita
Deposited On:28 Oct 2013 16:06
Last Modified:10 Nov 2021 04:38

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