Image:Skagit-gneiss-Cascades.jpg

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Banded Skagit gneiss with cross-cutting dike of younger granite orthogneiss.Orthogneiss of at least two different ages makes up much of the Skagit Gneiss Complex. Some magma intruded while rocks of the Metamorphic Core Domain were being squeezed and probably folded. While the magma crystallized or soon thereafter, the squeezing (or flattening) aligned the minerals and the rock became foliated orthogneiss. Twenty million years or so later, much of the squeezing had ceased. When new magma invaded, the newly crystallized granitic rocks developed much less foliation than their predecessors.


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Public domain This image is in the public domain because it contains materials that originally came from the United States Geological Survey, an agency of the United States Department of Interior. For more information, see the official USGS copyright policy

From: http://www2.nature.nps.gov/geology/usgsnps/noca/sb9migma.html

date/time username edit summary
23:59, 14 November 2004 en:User:Vsmith
23:53, 14 November 2004 en:User:Vsmith (Banded Skagit gneiss)

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current18:11, 3 February 2006217×324 (39 KB)Maksim (La bildo estas kopiita de wikipedia:en. La originala priskribo estas: Banded Skagit gneiss {{PD-USGov-Interior-USGS}} From: http://www2.nature.nps.gov/geology/usgsnps/noca/sb9migma.html {| border="1" ! date/time || username || edit summary |---- | 23:5)
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