File:Quartz monzonite 36mw1037.jpg

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Captions

Captions

Quartz monzonite sample

Summary

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Description
English: Bedrock sample from a UGSG drill core at Western Cape Cod, Massachusetts. Sample 36MW1037, a quartz monzonite, contains plagioclase (45%), K-feldspar (35%), quartz (15%), biotite (3%), and trace amounts of garnet, chlorite, oxides, epidote, and sphene. Seritized plagioclase is intergrown with K-feldspar and in some places shows unaltered zones that may suggest regrowth. Perthitic K-feldspar porphyries show tartan and some carlsbad twinning. Quartz occurs in domains up to 3 mm thick, and commonly exhibits subgrain development and undulose extinction. Biotite is chloritized near its edges. Garnet occurs as small (0.2 mm) rounded isotropic inclusions within altered plagioclase.
Source http://pubs.usgs.gov/of/2003/of03-221/htmldocs/bedrock_photos/36mw1037.htm
Author B.W. Hallett, V. F. Paskevich, L.J. Poppe, S.G. Brand, and D.S. Blackwood

Licensing

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

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current09:19, 27 May 2010Thumbnail for version as of 09:19, 27 May 20102,422 × 2,112 (751 KB)Woudloper (talk | contribs){{Information |Description={{en|1=Bedrock sample from a UGSG drill core at Western Cape Cod, Massachusetts. Sample 36MW1037, a quartz monzonite, contains plagioclase (45%), K-feldspar (35%), quartz (15%), biotite (3%), and trace amounts of garnet, chlori

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