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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:  03MW0102

DATE: 5/20/1998

Sample: 03MW0102 - Quartz Monzonite


Sample 03MW0102 is an unfoliated quartz monzonite with a composition of K-feldspar (50%), plagioclase (35%), quartz (8%), chlorite (2%), biotite (2%), muscovite (1%), and trace sphene, epidote, and oxides. There is little evidence of deformation in the sample. Perthitic K-feldspar phenocrysts show fractures that are filled with quartz. Intergrowths of plagioclase and K-feldspar are common. Plagioclase is altered to sericite and sausserite. It is unclear as to whether chlorite is intergrown with or replacing biotite

Latitude: 41.63938

Longitude: -70.54053

Elevation of well site (m): 28.67

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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