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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 location41° 38′ 30.59″ N, 70° 34′ 08.44″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

Licensing

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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Captions

Foliated amphibolite

Items portrayed in this file

depicts

13 March 2001

41°38'30.59"N, 70°34'8.44"W

image/jpeg

4b915118f57a68ebbd21d3e842cf56b6ad78b5c2

148,435 byte

604 pixel

600 pixel

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Date/TimeThumbnailDimensionsUserComment
current00:56, 4 December 2013Thumbnail for version as of 00:56, 4 December 2013600 × 604 (145 KB)GeoWriterUser created page with UploadWizard

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