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Rhenium-osmium and samarium-neodymium isotopic systematics of the Stillwater complexThe role of magma mixing in the formation of strategic platinum-group element ore deposits is examined using isotopic data from the Stillwater Complex, Montana. Nd and Os isotopic data show that the intrusion formed from at least two distinct magmas: ultramafic (U-type) affinity magmas and anorthositic (A-type) affinity magmas. The U-type magmas formed from a lithospheric mantle source containing recycled crustal materials and the A-type magmas originated either by crustal contamination of basaltic magmas or by partial melting of basalt in the lower crust. The results also suggest that the platinum-group element ore deposits were derived from A-type magmas which were injected into the U-type magma chamber at several stages during the development of the ultramafic series.
Document ID
19890056495
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lambert, David D.
(Carnegie Institution of Washington Washington, DC, United States)
Shirey, Steven B.
(Carnegie Institution of Washington Washington, DC, United States)
Carlson, Richard W.
(Carnegie Institution of Washington Washington, DC, United States)
Morgan, John W.
(Carnegie Institution of Washington Washington, DC, United States)
Walker, Richard J.
(USGS Reston, VA, United States)
Date Acquired
August 14, 2013
Publication Date
June 9, 1989
Publication Information
Publication: Science
Volume: 244
ISSN: 0036-8076
Subject Category
Geophysics
Accession Number
89A43866
Funding Number(s)
CONTRACT_GRANT: NAGW-398
CONTRACT_GRANT: NSF EAR-87-20836
Distribution Limits
Public
Copyright
Other

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