41 Review of isotope data for Precambrian rocks from the

Pb-Pb and Rb-Sr isotope data yield whole-rock isochron ages of c. 2800 Ma for two localities of granitoid rocks in the Disko Bugt region, with little evidence of strong later disturbance. Rb-Sr isotope data on Archaean metasediments from two localities, however, were strongly disturbed during the ea...

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Bibliographic Details
Main Authors: Disko Bugt Region, West Greenl, Feiko Kalsbeek, Paul N. Taylor
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
Archaean
Disko Bugt
Pb-Pb ages
Proterozoic
Rb-Sr ages
Sm-Nd ages
West Green
Disko bugt
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.547.1705
http://www.geus.dk/publications/bull-gl/nr181/nr181_p041-047.pdf
Description
Summary:Pb-Pb and Rb-Sr isotope data yield whole-rock isochron ages of c. 2800 Ma for two localities of granitoid rocks in the Disko Bugt region, with little evidence of strong later disturbance. Rb-Sr isotope data on Archaean metasediments from two localities, however, were strongly disturbed during the early Proterozoic. Sm-Nd whole-rock data for acid metavolcanic rocks within Archaean supracrustal sequences yield model ages of c. 2800 Ma. The early Proterozoic age of a younger sequence of supracrustal rocks (the Anap nunâ Group) is confi rmed by Sm-Nd data, and Rb-Sr whole-rock data for albitised siltstones show that albitisation took place hundreds of millions of years after the peak of early Proterozoic orogenic activity.

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