Multiphase inclusions in plagioclase from anorthosites in the Stillwater Complex, Montana: implications for the origin of the anorthosites

Article Abstract:

A study shows that multiphase inclusions such as clinopyroxene, ilmenite and apatite, exist in the cumulus plagioclase gains from anorthosites at Stillwater Complex, Montana. The composition of these inclusions reveals that they were added in the plagioclase as liquid droplets which later crystallized. The study proposes that the immiscible silicate liquid from which small globules of liquid containing magnesium, iron, calcium, titanium, phosphorous, rare earth elements, zircomium and manganese exsolved, is entrapped in plagioclase and crystallizes to form inclusions. The anorthosites formed account for the difference in the texture and chemical features of the other rocks in Stillwater complex.

Research, Rocks

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Comparative petrology of Archaen anorthosites in amphibolite and granulite facies terranes, SW Greenland

Article Abstract:

New field and petrographic observations, along with mineral-chemical data, relating to the amphibolite-facies Buksefjorden and granulite-facies Nordland anorthosites in SW Greenland, are reported. Plagioclase compositions are in the Ansub60-sub82 range, and most grains in the Ansub70-sub82 range show optically visible Huttenlocher intergrowths. Nordland plagioclase has an equilibrated, equigranular texture, reflecting slow cooling from high temperatures.

Physiological aspects, Observations, Natural history, Greenland, Petrology, Facies (Geology), Geologic facies

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The dependence of the partitioning of iron and europium between plagioclase and hydrous tonalitic melt on oxygen fugacity

Article Abstract:

The authors present a model for partitioning of iron (Fe) and europium (Eu), focusing on its relationship to oxygen fugacity. Topics include the model's ability to discuss the redox condition of the melt, development of buffering techniques, and relationship between Eu and Fe partitioning, hydrous tonalitic melts, and plagioclase.

Statistical Data Included, Methods, Models, Oxidation-reduction reaction, Oxidation-reduction reactions, Iron, Iron (Metal), Hydrogen content (Metals), Europium, Plasma arc melting

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