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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

27MW2134

SAMPLE_ID:  27MW2134

DATE: 4/22/2002

Sample: 27MW2134 - Granite

GRANITE

Sample 27MW2134 is a pink-orange granite composed of K-feldspar (38%), plagioclase (30%), quartz (25%), sericite (4%), muscovite (1%), and trace chlorite, oxides, and possibly zircon. Nearly equigranular K-feldspar (~0.6 mm) shows tartan twinning and some exsolution. Plagioclase, of similar grain size to K-feldspar, shows albite twins and is severely altered to sericite/muscovite. Some quartz exhibits 120 grain boundaries, suggesting recrystallization has occurred. This granite is unlike most of the other granites due to the lack of biotite. Chlorite, occurring in trace amounts, may have replaced biotite, but may also have replaced other mafics like hornblende. 

Latitude: 41.66636

Longitude: -70.56156

Elevation of well site (m): 31.63

Elevation of the upper
bedrock surface (m):
 -47.92

Elevation of the
top of casing (m):
 31.55

Total thickness of strata
penetrated by the well (m):
 81.08

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