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pb, sr, and nd isotopic compositions of a suite of large archean, igneous rocks, eastern beartooth mountains - implications for crust-mantle evolutionCompositionally diverse Late Archean rocks (2.74-2.79 Ga old) from the eastern Beartooth Mountains (Montana and Wyoming) were studied and shown to have the same initial Pb, Sr, and Nd isotopic ratios. Lead and Sr initial ratios are higher and Nd initial values lower than predicted for rocks derived from model mantle sources and strongly indicate the involvement of an older crustal reservoir in the genesis of these rocks. A model involving subduction of continental detritus and contamination of the overlying mantle is suggested.
Document ID
19880038766
Document Type
Reprint (Version printed in journal)
Authors
Wooden, J. L.
(USGS Menlo Park, CA, United States)
Mueller, P. A.
(Florida, University Gainesville, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1988
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 87
Issue: 1-2
ISSN: 0012-821X
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAG9-91
CONTRACT_GRANT: NSF EAR-82-11828
CONTRACT_GRANT: USGS-14-08-001-G-651
Distribution Limits
Public
Copyright
Other