Computer Science
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989sci...244.1169l&link_type=abstract
Science (ISSN 0036-8076), vol. 244, June 9, 1989, p. 1169-1174.
Computer Science
19
Geochemistry, Isotopic Enrichment, Magma, Neodymium, Osmium Isotopes, Petrology, Earth Crust, Lithosphere, Montana, Planetary Composition, Rhenium, Samarium
Scientific paper
The 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.
Carlson Richard W.
Lambert David D.
Morgan John W.
Shirey Steven B.
Walker Richard J.
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