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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:  36MW1037

DATE: 8/15/2000

Sample: 36MW1037 - Quartz Monzonite


Sample 36MW1037, a quartz monzonite, contains plagioclase (45%), K-feldspar (35%), quartz (15%), biotite (3%), and trace amounts of garnet, chlorite, oxides, epidote, and sphene. Seritized plagioclase is intergrown with K-feldspar and in some places shows unaltered zones that may suggest regrowth. Perthitic K-feldspar porphyries show tartan and some carlsbad twinning. Quartz occurs in domains up to 3 mm thick, and commonly exhibits subgrain development and undulose extinction. Biotite is chloritized near its edges. Garnet occurs as small (0.2 mm) rounded isotropic inclusions within altered plagioclase.

Latitude: 41.64536

Longitude: -70.50336

Elevation of well site (m): 30.94

Elevation of the upper
bedrock surface (m):

Elevation of the
top of casing (m):

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

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