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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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Maksim .
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here . All following user names refer to en.wikipedia.
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http://www2.nature.nps.gov/geology/usgsnps/noca/sb9migma.html
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15:13, 10 September 2015
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NawlinWiki Reverted to version as of 18:11, 3 February 2006
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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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