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Neodymium-142 evidence for Hadean mafic crust.
MedLine Citation:
PMID:  18818357     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Neodymium-142 data for rocks from the Nuvvuagittuq greenstone belt in northern Quebec, Canada, show that some rock types have lower 142Nd/144Nd ratios than the terrestrial standard (epsilon142Nd = -0.07 to -0.15). Within a mafic amphibolite unit, 142Nd/144Nd ratios correlate positively with Sm/Nd ratios and produce a 146Sm-142Nd isochron with an age of 4280(-81)(+53) million years. These rocks thus sample incompatible-element-enriched material formed shortly after Earth formation and may represent the oldest preserved crustal section on Earth.
Authors:
Jonathan O'Neil; Richard W Carlson; Don Francis; Ross K Stevenson
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  321     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-09-26     Completed Date:  2008-10-06     Revised Date:  2009-07-17    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1828-31     Citation Subset:  -    
Affiliation:
Earth and Planetary Sciences Department, McGill University, 3450 University Street, Montreal, Quebec, H3A 2A7, Canada. oneil_jo@eps.mcgill.ca
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Comment In:
Science. 2009 Jul 17;325(5938):267; author reply 267   [PMID:  19608899 ]
Science. 2008 Sep 26;321(5897):1755   [PMID:  18818329 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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