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Record Details

Record 13 of 1809
Neodymium and lead isotope evidence for enriched early Archean crust in North America
External Online Source: doi:10.1038/340222a0
Author and Affiliation:
Bowring, Samuel A.(Geological Survey of Canada, Ottawa Ontario, Canada)
Housh, Todd B.(Geological Survey of Canada, Ottawa Ontario, Canada)
Isachsen, Clark E.(Geological Survey of Canada, Ottawa Ontario, Canada)
Podosek, Frank A.(Washington University, Saint Louis, MO, United States)
King, Janet E.(Geological Survey of Canada, Lithosphere and Shield Div., Ottawa, United States)
Abstract: Neodymium and lead isotope measurements and uranium-lead zircon geochronology from Archaean gneisses of the Slave Province in the Northwest Territories of Canada are reported. The gneisses contain zircons with cores older than 3.842 Gyr and an epsilon(Nd) (3.7 Gyr) of - 4.8. This is the oldest reported chondritic model age for a terrestrial sample and provides evidence for strongly enriched pre-3.8-Gyr crust, a reservoir complementary to the depleted mantle already in existence by 3.8 Gyr before the present.
Publication Date: Jul 20, 1989
Document ID:
19890059213
(Acquired Nov 28, 1995)
Accession Number: 89A46584
Subject Category: GEOPHYSICS
Document Type: Journal Article
Publication Information: Nature (ISSN 0028-0836); 340; 222-225
Publisher Information: United Kingdom
Organization Source: Geological Survey of Canada; Ottawa Ontario, Canada
Washington Univ.; Saint Louis, MO, United States
Description: 4p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: EARTH CRUST; GEOCHEMISTRY; ISOTOPIC ENRICHMENT; LEAD ISOTOPES; NEODYMIUM ISOTOPES; BIOTITE; CRATONS; FELDSPARS; NORTH AMERICA; ROCKS
Imprint And Other Notes: Nature (ISSN 0028-0836), vol. 340, July 20, 1989, p. 222-225. Research supported by NASA and NSF.
Miscellaneous Notes: Research supported by NASA and NSF
Availability Source: Other Sources
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