Further U-Pb dates on zircons from the early Precambrian rocks of the Godthaabsfjord area, West Greenland

Details Further U-Pb dates on zircons from the early Precambrian rocks of the Godthaabsfjord area, West Greenland Further U-Pb dates on zircons from the early Precambrian rocks of the Godthaabsfjord area, West Greenland

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..33..261b&link_type=abstract

Earth and Planetary Science Letters, Volume 33, Issue 2, p. 261-267.

Physics

12

Scientific paper

U-Pb analyses of zircons from the Godthaabsfjord area in West Greenland yield dates of 2530 +/- 30 m.y. for the Qôrqut granite, 2820 +/- 50 m.y. for the Nûk gneiss, 2600-2900 m.y. for Malene-type supracrustal rocks, and >3800 m.y. for Isua supracrustal rocks. The zircon data are in accord with the stratigraphic sequence except for the Malene supracrustal zircons, which appear to have been variably affected by later metamorphism that did not reset the Nûk or Amîtsoq zircons in the same area.

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