Chemical Variation in Coexisting Chromite and Olivine in Chromitite Zones of the Stillwater Complex

SummaryThe chemical variation of clinopyroxene phenocrysts from the trachybasaltic lavas of Etna volcano is described. The phenocrysts show a limited, but distinct trend in chemical variation from calcic-augite in the hawaiites to augite in the benmoreites. The trend of this variation is unusual, being one of Mg-enrichment with differentiation of the magma. Ca shows a steady decrease in the clinopyroxenes from the hawaiites to the benmoreites. Na, however, shows little chemical variation in the pyroxenes. The trace element chemistry is briefly examined. The clinopyroxenes show well-developed oscillatory and sector zoning. The basal {11} sectors are enriched in Si and Mg and depleted in Ti, Al, and Fe relative to the {100}, {110}, and {010} prism sectors.

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Palladium, platinum, and rhodium contents of rocks near the lower margin of the Stillwater Complex, Montana

Economic Geology ◽

10.2113/gsecongeo.81.5.1169 ◽

1986 ◽

Vol 81 (5) ◽

pp. 1169-1178 ◽

Cited By ~ 11

Author(s):

Michael L. Zientek ◽

Michael P. Foose ◽

Leung Mei

Keyword(s):

Lower Margin ◽

Stillwater Complex ◽

Palladium Platinum

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Taxonomy of the lichen Cladonia rei and its status in Poland

Biologia ◽

10.2478/s11756-008-0092-1 ◽

2008 ◽

Vol 63 (4) ◽

Cited By ~ 12

Author(s):

Magdalena Syrek ◽

Martin Kukwa

Keyword(s):

General Distribution ◽

Habitat Requirements ◽

Chemical Variation ◽

The West

AbstractCladonia rei (Cladoniaceae, lichenized Ascomycota), a species recently synonymised with C. subulata, deserves to be treated as a separate taxon. Since C. rei was very much neglected in Poland and most previous records referred to C. glauca and C. subulata, its distribution and habitat requirements in the country are reviewed. It is commoner in the eastern part of Poland, becoming rarer towards the west. Information on its chemical variation and general distribution are also provided.

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