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Role of replacement in the genesis of anorthosite in the Boehls Butte area, Idaho.

Geological Society of Finland, Bulletin
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Abstract

In this area in N Idaho, three large and numerous small lenses of layered to massive anorthosite consisting of two, and locally three, types of plagioclase with minor hornblende and mica occur in aluminium silicate-rich garnet mica schist. In most of this anorthosite, megacrysts of andesine with bytownite inclusions are embedded in a fine-grained groundmass of bytownite or anorthite; locally, labradorite occurs rather than andesine. Some labradorite laths show Carlsbad twinning and rims of andesine around anorthite inclusions. Along the contacts, lenses of fine-grained bytownite anorthosite with some hornblende or garnet and quartz are common. These lenses could represent calcic parent rocks converted to two-plagioclase rocks by partial replacement of bytownite by andesine. -R.A.H.
Publication type Article
Publication Subtype Journal Article
Title Role of replacement in the genesis of anorthosite in the Boehls Butte area, Idaho.
Series title Geological Society of Finland, Bulletin
Volume 58
Issue 1
Year Published 1986
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Geological Society of Finland, Bulletin
First page 71
Last page 79
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