Physics
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..41..245j&link_type=abstract
Earth and Planetary Science Letters, Volume 41, Issue 3, p. 245-253.
Physics
14
Scientific paper
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.
Jacobsen Stein B.
Wasserburg Gerald J.
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