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The tectonic setting of Archean anorthositesArchean anorthosites, anorthositic gabbros, and related rocks form intrusive complexes in every Archean craton. These complexes are characterized by the presence of equidimensional plagioclase megacrysts of typically uniform and calcic (An80-90) composition. Many, if not all, such complexes developed in greenstone belt terrains and appear to be genetically linked to contemporary volcanics. The petrogenesis of Archean anorthosites appears to argue for development in oceanic settings and implies intensive magmatic activity.
Document ID
19880020847
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Morrison, D. A. (NASA Lyndon B. Johnson Space Center Houston, TX., United States)
Phinney, W. C. (NASA Lyndon B. Johnson Space Center Houston, TX., United States)
Maczuga, D. E. (Lockheed Engineering and Management Services Co., Inc. Houston, Tex., United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1988
Publication Information
Publication: Lunar and Planetary Inst., Workshop on the Growth of Continental Crust
Subject Category
Geophysics
Accession Number
88N30231
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19880020817Collected WorksWorkshop on the Growth of Continental Crust
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