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Mantle heterogeneity and crustal recycling in Archean granite-greenstone belts - Evidence from Nd isotopes and trace elements in the Rainy Lake area, Superior Province, Ontario, CanadaCrustal evolution in the Rainy Lake area, Ontario is studied in terms of geochemical characteristics. The Nd isotope data are examined for heterogeneity of the Archean mantle, and the Sm/Nd depletion of the mantle is analyzed. The Nd isotope systematics of individual rock suites is investigated in order to understand the difference between crust and mantle sources; the precursors and petrogenetic processes are discussed. The correlation between SiO2 content and Nd values is considered. Rapid recycling of crustal components, which were previously derived from depleted mantle sources, is suggested based on the similarity of the initial Nd isotopic composition for both mantle-derived and crustally-derived rocks.
Document ID
19870043253
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shirey, Steven B.
(State Univ. of New York Stony Brook, NY, United States)
Hanson, Gilbert N.
(New York, State University Stony Brook, United States)
Date Acquired
August 13, 2013
Publication Date
December 1, 1986
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 50
ISSN: 0016-7037
Subject Category
Geophysics
Accession Number
87A30527
Funding Number(s)
CONTRACT_GRANT: NAGW-486
CONTRACT_GRANT: NAG9-92
CONTRACT_GRANT: NSF EAR-79-26363
CONTRACT_GRANT: NAGW-398
Distribution Limits
Public
Copyright
Other

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