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Peculiar Gneisses and Ore Formations in the Eastern Cascades, Washington
The Journal of Geology
Vol. 41, No. 7 (Oct. - Nov., 1933), pp. 757-768
Published by: The University of Chicago Press
Stable URL: http://www.jstor.org/stable/30055921
Page Count: 12
You can always find the topics here!Topics: Gneiss, Quartz, Minerals, Tunnels, Biotite, Plagioclase, Rocks, Crystals, Trinity, Calcite
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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.
The Journal of Geology © 1933 The University of Chicago Press