File:Amphibolite from under Cape Cod USA.jpg
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Summary
| Description |
English: Foliated amphibolite, sample 81MW0005, a borehole sample from under Cape Cod in Massachusetts in USA. It is made of the minerals plagioclase (35%), hornblende (20%), biotite (20%), epidote (15%), quartz (9%), and trace oxides and sphene. Plagioclase is mostly fine grained and subhedral and occurs in the matrix. Fine-grained hornblende occurs as anhedral pleochroic green-tan crystals. Biotite is partly, but not entirely aligned in the foliation, suggesting that deformation took place before a secondary growth of biotite. Epidote is anhedral, and sometimes rimmed by biotite. Quartz occurs in 2 mm-thick aggregates and shows subgrain development. |
| Date | |
| Source | U.S. Geological Survey Open-File Report 03-221 (2004) A Pictorial Survey of the Bedrock Beneath Western Cape Cod, Massachusetts, sample 81mw0005 http://pubs.usgs.gov/of/2003/of03-221/htmldocs/bedrock_photos/81mw0005.htm |
| Author | B.W. Hallett, V. F. Paskevich, L.J. Poppe, S.G. Brand, and D.S. Blackwood |
| Object location |  | View this and other nearby images on: OpenStreetMap |  |
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Licensing
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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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:56, 4 December 2013 | | 600 × 604 (145 KB) | GeoWriter | User created page with UploadWizard |
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