Evidence for extreme mantle fractionation in early Archaean ultramafic rocks from northern Labrador

Samarium-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 t...

Full description

Bibliographic Details
Main Authors: Collerson, Kenneth D., Campbell, Lisa M., Weaver, Barry L., Palacz, Zenon A.
Format: Other/Unknown Material
Language:unknown
Published: 1991
Subjects:
46
North Atlantic
Online Access:http://ntrs.nasa.gov/search.jsp?R=19910038883
id ftnasantrs:oai:casi.ntrs.nasa.gov:19910038883
record_format openpolar
spelling ftnasantrs:oai:casi.ntrs.nasa.gov:19910038883 2023-05-15T17:30:47+02:00 Evidence for extreme mantle fractionation in early Archaean ultramafic rocks from northern Labrador Collerson, Kenneth D. Campbell, Lisa M. Weaver, Barry L. Palacz, Zenon A. Unclassified, Unlimited, Publicly available Jan 17, 1991 http://ntrs.nasa.gov/search.jsp?R=19910038883 unknown http://ntrs.nasa.gov/search.jsp?R=19910038883 Accession ID: 91A23506 Copyright Other Sources 46 Nature; 349; 209-214 1991 ftnasantrs 2012-02-15T18:57:14Z Samarium-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. Other/Unknown Material North Atlantic NASA Technical Reports Server (NTRS)
institution Open Polar
collection NASA Technical Reports Server (NTRS)
op_collection_id ftnasantrs
language unknown
topic 46
spellingShingle 46
Collerson, Kenneth D.
Campbell, Lisa M.
Weaver, Barry L.
Palacz, Zenon A.
Evidence for extreme mantle fractionation in early Archaean ultramafic rocks from northern Labrador
topic_facet 46
description Samarium-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.
format Other/Unknown Material
author Collerson, Kenneth D.
Campbell, Lisa M.
Weaver, Barry L.
Palacz, Zenon A.
author_facet Collerson, Kenneth D.
Campbell, Lisa M.
Weaver, Barry L.
Palacz, Zenon A.
author_sort Collerson, Kenneth D.
title Evidence for extreme mantle fractionation in early Archaean ultramafic rocks from northern Labrador
title_short Evidence for extreme mantle fractionation in early Archaean ultramafic rocks from northern Labrador
title_full Evidence for extreme mantle fractionation in early Archaean ultramafic rocks from northern Labrador
title_fullStr Evidence for extreme mantle fractionation in early Archaean ultramafic rocks from northern Labrador
title_full_unstemmed Evidence for extreme mantle fractionation in early Archaean ultramafic rocks from northern Labrador
title_sort evidence for extreme mantle fractionation in early archaean ultramafic rocks from northern labrador
publishDate 1991
url http://ntrs.nasa.gov/search.jsp?R=19910038883
op_coverage Unclassified, Unlimited, Publicly available
genre North Atlantic
genre_facet North Atlantic
op_source Other Sources
op_relation http://ntrs.nasa.gov/search.jsp?R=19910038883
Accession ID: 91A23506
op_rights Copyright
_version_ 1766127792127213568

Similar Items