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U.S. Geological Survey Open-File Report 03-221
A Pictorial Survey of the Bedrock Beneath Western Cape Cod, Massachusetts

 Detailed Bedrock Photographskip navbar


SAMPLE_ID:  03MW2623

DATE: 7/7/2000

Sample: 03MW2623 - Granite


Sample 03MW2623 is a granite with a composition of K-feldspar (45%), plagioclase (30%), quartz (20%), biotite (2%), oxides (1%), and trace muscovite and epidote. This sample is characterized by large, extremely perthitic (string perthite) porphyries of untwined K-feldspar. Plagioclase occurs as finer matrix grains and inclusions in K-feldspar, in some places showing albite twinning. Serrated quartz grains exhibit undulose extinction and subgrain development. "Flattened" quartz grains near the edges of K-feldspar porphyries may represent partial quartz annealing. Biotite is microcrystalline and does not define a foliation.

Latitude: 41.62268

Longitude: -70.53959

Elevation of well site (m): 24.59

Elevation of the upper
bedrock surface (m):

Elevation of the
top of casing (m):

Total thickness of strata
penetrated by the well (m):

A Thin Section of this image is available.

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