Stratigraphy, petrology, and structure of the Pingston terrane, Mount Hayes C-5 and C-6 quadrangles, eastern Alaska Range, Alaska
Abstract
Recent field, petrologic, and structural studies of the Pingston terrane in the Mount Hayes C-5 and C-6 quandrangles reveal that in this area the terrane: (1) has a highly distinctive stratigraphy, age, petrology (relict textures, relict minerals, and metamorphic facies), and structure; and (2) differs markedly from that described in previous studies. These more recent studies indicate that the major rock types, in order of decreasing abundance, are meta-andesite, metadacite and metarhyodacite flows and (or) tuff, metabasalt, metagabbro, metavolcanic graywacke, metagray-wacke, metasiltstone, metaquartzite or metachert, and very sparse marble. The general petrography of the major rock units in the Pingston terrane is given.
- Publication:
-
The United States Geological Survey in Alaska
- Pub Date:
- 1984
- Bibcode:
- 1984usgs.nasa...70N
- Keywords:
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- Mountains;
- Petrology;
- Rocks;
- Stratigraphy;
- Terrain;
- Alaska;
- Geochronology;
- Maps;
- Geophysics