Geochronological and lead-isotope evidences for rapid crust formation in middle-proterozoic time: The Labrador example

• Main Author: Schaerer, Urs
• Format: Other/Unknown Material
• Language: unknown
• Published: 1988
• Subjects: 46; Makkovik
• Online Access: http://ntrs.nasa.gov/search.jsp?R=19880020855

Extensive U-Pb geochronological studies in the Grenville and Makkovik provinces have shown that eastern Labrador is underlain by two distinct crustal blocks. In order to substantiate the juvenile character of the middle-Proterozoic crustal block, the isotopic compositon of lead in leached k-feldspar...