Geochronological and lead-isotope evidences for rapid crust formation in middle-proterozoic time: The Labrador example
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...
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Format: | Other/Unknown Material |
Language: | unknown |
Published: |
1988
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Online Access: | http://ntrs.nasa.gov/search.jsp?R=19880020855 |
Summary: | 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-feldspars from the same rocks were analyzed. The results of the analysis are briefly discussed. |
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