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• W2471588107 abstract "Smith, Kevin J . , M.S., Spring, 1980 Geology Petrology and Origin of Precambrian Metamorphic Rocks in the eastern Ruby Mountains, Sout i Montana (84 pp.) Precambrian schists and gneisses are exposed in much of the Ruby Mountains of southwestern Montana. The major rock types include abundant quartz-feldspar gneiss, hornblende gneiss, amphibolite, quartz itic gneiss, and marble. Minor rock types important in the study area include anthophyl1ite gneiss, hornblende-pyroxene-plagioclase gneiss, quartz-hypersthene-garnet granulite, iron-formation, and hornblende-hypersthene granulite. These rocks form a concordant series folded into a broad, open anti form-synform pair in the study area. The marble, quartzitic gneiss, and iron-formation in the area clearly originated as sedimentary units. The hornblende gneiss assemblage was also found to be dominantly sedimentary in origin. Evidence for this includes its association with marble and quartz itic gneiss, the la t te r intimately mixed within i t , the presence of meta-conglomerates, and the abundance of quartz making the composition d is tinctly d ifferent from normal igneous rocks. A petrographic estimate of composition for one amphibolite showed i t to most resemble a dolomitic shale. I t is possible that some amphibolites in the area are metamorphosed dikes and s i l ls . The uniform granitic composition and lack of structures in the quartz-feldspar gneiss suggest an igneous origin for this unit. Metamorphism in the area exceeded the s i l 1imanite-orthoclase zone of the amphibolite facies as indicated by the presence of si 11imanite, perth ite , and calcic plagioclase An4 2 The presence of the assemblage quartz-hypersthene-garnet, and textures indicating the reaction anthophyll i te enstati te + quartz show that conditions ran locally into the orthopyroxene zone of the granulite facies. These probably represent areas locally undersaturated in water. The area went through two phases of regional deformation. The f i r s t event, roughly contemporaneous with the highest metamorphic grades, produced s im ilar-sty le , t ight isoclinal folds and the regional fo lia t io n . Subsequent to that,, the area was folded into a large, concentric, open antiform-synform pair trending northeasterly and plunging at moderate to steep angles. Small super-imposed folds of undetermined age re­ lationship to the second event also exist. Director: David A lt" @default.
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• W2471588107 date "1980-01-01" @default.
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• W2471588107 title "Petrology and Origin of Precambrian Metamorphic Rocks in the Eastern Ruby Moutains Southwestern Montana" @default.
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