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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:  03MW0107

DATE: 6/4/1998

Sample: 03MW0107 - Quartz Diorite


A quartz diorite, sample 03MW0107 is composed of plagioclase (50%), muscovite (20%), quartz (12%), biotite (10%), K-feldspar (3%), sphene (2%), oxides (2%), and epidote (1%). This sample shows severe alteration of plagioclase to grow biotite, muscovite/sericite, and epidote. No foliation is recognized. Biotite is pleochroic and probably has, along with epidote, replaced mafic minerals like hornblende. Fine-grained quartz shows undulose extinction.

Latitude: 41.66787

Longitude: -70.55009

Elevation of well site (m): 40.76

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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