Abstract
Bridgwater and Collerson are congratulated on their important contributions to the knowledge of early Archaean terrains in Labrador and southwestern Greenland. Many of the interpretations advanced in their paper (Bridgwater and Collerson, 1976) throw much light on the evolution of deep-seated Archaean crustal domains. Other interpretations, however, raise a number of questions, discussed below in the following terms; (1) nature of original field relations between Uivak gneiss and Upernavik supracrustals; (2) timing of development of K-feldspar bands in Uivak gneiss; (3) isotopic effects of Rb-addition associated with the development of the K-feldspar bands; (4) crustal history of Uivak gneiss precursors, and (5) relations between gneisses of high-grade terrains and granites of low-grade terrains in the Archaean. In each case, the questions are accompanied by suggested tentative interpretations.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
