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Evidence for extreme mantle fractionation in early Archaean ultramafic rocks from northern LabradorSamarium-neodymium isotope data for tectonically interleaved fragments of lithospheric mantle and meta-komatiite from the North Atlantic craton provide the first direct record of mantle differentiation before 3,800 Myr ago. The results confirm the magnitude of light-rare-earth-element depletion in the early mantle, and also its depleted neodymium isotope composition. The mantle fragments were able to retain these ancient geochemical signatures by virtue of having been tectonically incorporated in buoyant felsic crust, thus escaping recycling and homogenization by mantle convection.
Document ID
19910038883
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Collerson, Kenneth D.
(California Univ. Santa Cruz, CA, United States)
Campbell, Lisa M.
(California, University Santa Cruz, United States)
Weaver, Barry L.
(Oklahoma, University Norman, United States)
Palacz, Zenon A.
(VG Isotech Middlewich, United Kingdom)
Date Acquired
August 15, 2013
Publication Date
January 17, 1991
Publication Information
Publication: Nature
Volume: 349
ISSN: 0028-0836
Subject Category
Geophysics
Accession Number
91A23506
Distribution Limits
Public
Copyright
Other

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