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- W121725593 abstract "Orthoamphibole-bearing rocks occur in the Tobacco Root Mountains adjacent to shelf-deposited metasedimentary rocks (quartzofeldspathic gneiss, amphibolite, quartzite, marbles, aluminous schist, and iron-formation). Determination of the protolith of the orthoamphibole-bearing rocks is crucial to developing a plate-tectonic model of the area. The author interprets the orthoamphibole-bearing rocks to be hydrothermally altered calc-alkaline basalts that have been metamorphosed to amphibolite grade. A La/Ce plot yields a linear trend through the origin, which suggests a genetic relationship among the different orthoamphibole-bearing units. Rocks plotted on a Ti-Zr-Y ternary diagram fall in the field of calc-alkaline basalts. This plot utilizes elements that are not hydrothermally mobile, so reflects the protolith. Plots of Sr versus CaO show linear trends, suggesting that Sr and Ca were both depleted by the same hydrothermal processes." @default.
- W121725593 created "2016-06-24" @default.
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- W121725593 date "1994-04-01" @default.
- W121725593 modified "2023-09-25" @default.
- W121725593 title "Geochemistry of orthoamphibole-bearing Archean rocks, Tobacco Root Mountains, Montana" @default.
- W121725593 hasPublicationYear "1994" @default.
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