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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:  82MW0006

DATE: 6/3/2001

Sample: 82MW0006 - Granite


Sample 82MW0006 is an unfoliated granodiorite with a composition of plagioclase (48%), quartz (25%), K-feldspar (11%), biotite (8%), chlorite (4%), sericite (2%), epidote (1%), and trace sphene and oxides. Plagioclase is extremely seritized/sausseritized. Porphyries are commonly albite twinned, tabular, and rimmed by biotite. Quartz shows an interlocking texture and slight undulose extinction and subgrain development. K-feldspars are somewhat altered, perthitic, and seem to replace plagioclase in some places. Biotite is orange-green-brown pleochroic, and occurs as irregularly shaped grains filling between plagioclase crystals. Chloritization is common in all biotite, and some has been completely replaced. Fractures in this rock are filled by calcite and opaque minerals.

Latitude: 41.64319

Longitude: -70.58202

Elevation of well site (m): 37.98

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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