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Lead isotope systematics of some igneous rocks from the Egyptian ShieldLead isotope data on whole-rock samples and two feldspar separates for a variety of Pan-African (late Precambrian) igneous rocks for the Egyptian Shield are presented. It is pointed out that the eastern desert of Egypt is a Late Precambrian shield characterized by the widespread occurrence of granitic plutons. The lead isotope ratios may be used to delineate boundaries between Late Precambrian oceanic and continental environments in northeastern Africa. The samples belong to three groups. These groups are related to a younger plutonic sequence of granites and adamellites, a plutonic group consisting of older tonalites to granodiorites, and the Dokhan volcanic suite.
Document ID
19830065486
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gillespie, J. G.
(California, University Santa Barbara, CA, United States)
Dixon, T. H.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena CA, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Publication Information
Publication: Precambrian Research
Volume: 20
ISSN: 0301-9268
Subject Category
Geophysics
Accession Number
83A46704
Distribution Limits
Public
Copyright
Other

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