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Trace element abundances in megacrysts and their host basalts - Constraints on partition coefficients and megacryst genesisRare earth and other trace element abundances are determined in megacrysts of clinopyroxene, orthopyroxene, amphibole, mica, anorthoclase, apatite and zircon, as well as their host basalts, in an effort to gather data on mineral/melt trace element partitioning during the high pressure petrogenesis of basic rocks. Phase equilibria, major element partitioning and isotopic ratio considerations indicate that while most of the pyroxene and amphibole megacrysts may have been in equilibrium with their host magmas at high pressures, mica, anorthoclase, apatite, and zircon megacrysts are unlikely to have formed in equilibrium with their host basalts. It is instead concluded that they were precipitated from more evolved magmas, and have been mixed into their present hosts.
Document ID
19840057215
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Irving, A. J.
(Lunar and Planetary Institute Houston, TX, United States)
Frey, F. A.
(MIT Cambridge, MA, United States)
Date Acquired
August 12, 2013
Publication Date
June 1, 1984
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 48
ISSN: 0016-7037
Subject Category
Geophysics
Accession Number
84A40002
Funding Number(s)
CONTRACT_GRANT: NSF DES-75-02900
CONTRACT_GRANT: NSF EAR-78-23423
CONTRACT_GRANT: NSR-09-051-001
Distribution Limits
Public
Copyright
Other

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