SM-ND isotopic studies of proterozoic anorthosites Systematics and implications

Sm-Nd isotopic studies of anorthosites can be used to provide information on their ages of crystallization and metamorphism, contamination history, and mantle sources. Proterozoic anorthosites in the Grenville and Nain Provinces of eastern North America crystallized between about 1100 and 1600 Ma, a...

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Main Authors: Ashwal, L. D., Wooden, J. L.
Language:unknown
Published: 1985
Subjects:
46
Nain
Online Access:http://ntrs.nasa.gov/search.jsp?R=19860064880
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spelling ftnasantrs:oai:casi.ntrs.nasa.gov:19860064880 2023-05-15T17:13:58+02:00 SM-ND isotopic studies of proterozoic anorthosites Systematics and implications Ashwal, L. D. Wooden, J. L. Unclassified, Unlimited, Publicly available JAN 1, 1985 http://ntrs.nasa.gov/search.jsp?R=19860064880 unknown http://ntrs.nasa.gov/search.jsp?R=19860064880 Accession ID: 86A49618 Copyright Other Sources 46 1985 ftnasantrs 2012-02-15T16:51:32Z Sm-Nd isotopic studies of anorthosites can be used to provide information on their ages of crystallization and metamorphism, contamination history, and mantle sources. Proterozoic anorthosites in the Grenville and Nain Provinces of eastern North America crystallized between about 1100 and 1600 Ma, and some were metamorphosed at about 1000 Ma. Grenville Province anorthosite massifs were derived from depleted mantle. It is not clear whether massifs and related mafic intrusions throughout the Nain Province of Labrador were derived from enriched mantle, or were contaminated by early Archean (greater than 3500 Ma) silicic crustal materials, heretofore thought to be restricted to coastal Labrador. Other/Unknown Material Nain NASA Technical Reports Server (NTRS) Nain ENVELOPE(-61.695,-61.695,56.542,56.542)
institution Open Polar
collection NASA Technical Reports Server (NTRS)
op_collection_id ftnasantrs
language unknown
topic 46
spellingShingle 46
Ashwal, L. D.
Wooden, J. L.
SM-ND isotopic studies of proterozoic anorthosites Systematics and implications
topic_facet 46
description Sm-Nd isotopic studies of anorthosites can be used to provide information on their ages of crystallization and metamorphism, contamination history, and mantle sources. Proterozoic anorthosites in the Grenville and Nain Provinces of eastern North America crystallized between about 1100 and 1600 Ma, and some were metamorphosed at about 1000 Ma. Grenville Province anorthosite massifs were derived from depleted mantle. It is not clear whether massifs and related mafic intrusions throughout the Nain Province of Labrador were derived from enriched mantle, or were contaminated by early Archean (greater than 3500 Ma) silicic crustal materials, heretofore thought to be restricted to coastal Labrador.
author Ashwal, L. D.
Wooden, J. L.
author_facet Ashwal, L. D.
Wooden, J. L.
author_sort Ashwal, L. D.
title SM-ND isotopic studies of proterozoic anorthosites Systematics and implications
title_short SM-ND isotopic studies of proterozoic anorthosites Systematics and implications
title_full SM-ND isotopic studies of proterozoic anorthosites Systematics and implications
title_fullStr SM-ND isotopic studies of proterozoic anorthosites Systematics and implications
title_full_unstemmed SM-ND isotopic studies of proterozoic anorthosites Systematics and implications
title_sort sm-nd isotopic studies of proterozoic anorthosites systematics and implications
publishDate 1985
url http://ntrs.nasa.gov/search.jsp?R=19860064880
op_coverage Unclassified, Unlimited, Publicly available
long_lat ENVELOPE(-61.695,-61.695,56.542,56.542)
geographic Nain
geographic_facet Nain
genre Nain
genre_facet Nain
op_source Other Sources
op_relation http://ntrs.nasa.gov/search.jsp?R=19860064880
Accession ID: 86A49618
op_rights Copyright
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