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Peculiar Gneisses and Ore Formations in the Eastern Cascades, Washington

Stephen Richarz
The Journal of Geology
Vol. 41, No. 7 (Oct. - Nov., 1933), pp. 757-768
Stable URL: http://www.jstor.org/stable/30055921
Page Count: 12
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Peculiar Gneisses and Ore Formations in the Eastern Cascades, Washington
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Abstract

Gneisses made from an argillaceous sediment and dioritic injections are described. The injected material is of the same composition and texture as the pegmatite and aplite dikes intruded in these gneisses. The contact of gneiss and granodiorite consists of a mineralized brecciated zone on a large scale. Pyrrhotite and chalcopyrite are the most important ores.

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