Geohydrology of the Rainy Creek igneous complex near Libby, Montana
AuthorZinner, Ronald Eric
Geological Sciences & Engineering
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The Rainy Creek alkaline-ultramafic complex consists mainly of an ultramafic pluton crudely circular in plain view, composed primarily of magnetite pyroxenite, “vermiculite” pyroxenite, and biotite pyroxenite arranged in an inward succession. Weathering of the biotite pyroxenite by groundwaters is concluded to be the major altering process but dilute hydrothermal fluids may have been responsible for a small amount of alteration.
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