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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:  03MW0109

DATE: 6/2/1998

Sample: 03MW0109 - Quartz Diorite


Sample 03MW0109 is a quartz diorite with a composition of plagioclase (63%), quartz (10%), biotite (10%), muscovite/sericite (10%), K-feldspar (3%), epidote (2%), sphene (2%), and oxides (1%). K-feldspar is very minor and may have been replaced partly by plagioclase. Plagioclase has been severely altered to sericite and eventually muscovite. Quartz grains show undulose extinction and subgrains, suggesting some deformation. Biotite occurs in bundles around sphene along with fine-grained epidote.

Latitude: 41.65940

Longitude: -70.54689

Elevation of well site (m): 37.80

Elevation of the upper
bedrock surface (m):

Elevation of the
top of casing (m):

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

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