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- W2081463742 abstract "Abstract A glacial boulder found at the village of Norsjövallen, 80 km WNW of the town of Skellefteå in Västerbotten County, contains orbicules characterized by plagioclase (oligoclase) cores, which are surrounded by shells containing amphibole (actinolite), plagioclase and biotite. The grain size decreases outwards, accompanied by a greater degree of preferred orientation in the minerals. Amphibole, plagioclase and biotite are arranged so that their c-axes are aligned towards the centre of the orbicules. The matrix is much more granitic than the orbicules. In the matrix, microcline, plagioclase, quartz and biotite are the major phases. A deeply etched boulder of orbiculite from Småland's Anneberg, 10 km NE of the town of Nässjö, also shows orbicules with plagioclase (oligoclase) cores, although in this case the cores have been affected by secondary microcline mineralization. Outer shells show contrasting proportions between plagioclase, hornblende and biotite. The outermost shells are characterized by an abundance of magnetite and a near absence of biotite and hornblende. The matrix textures vary from aplitic to pegmatitic. Sillimanite is present in the feldspars. Microcline, plagioclase and quartz are the primary matrix minerals. Most biotite is seen in large pegmatitic clusters. The matrix just outside the orbicules is often enriched in plagioclase. Analyses of K2O and Na2O from different parts of both orbiculites show that in each case the orbicules and matrix form a differentiation trend. Intermediate compositions are lacking, however, except in the matrix nearest the orbicules and in the Småland's Anneberg orbiculite in the recrystallized cores." @default.
- W2081463742 created "2016-06-24" @default.
- W2081463742 creator A5070700090 @default.
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- W2081463742 date "1973-03-31" @default.
- W2081463742 modified "2023-10-16" @default.
- W2081463742 title "Orbiculites from Norsjövallen and Småland's Anneberg, Sweden" @default.
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- W2081463742 doi "https://doi.org/10.1080/11035897309455430" @default.
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