SAMPLE_ID:  81MW0005

DATE: 3/13/2001

AMPHIBOLITE

A foliated amphibolite, sample 81MW0005 is comprised of plagioclase (35%), hornblende (20%), biotite (20%), epidote (15%), quartz (9%), and trace oxides and sphene. Plagioclase is mostly fine grained and subhedral and occurs in the matrix. Fine-grained hornblende occurs as anhedral pleochroic green-tan crystals. Biotite is partly, but not entirely aligned in the foliation, suggesting that deformation took place before a secondary growth of biotite. Epidote is anhedral, and sometimes rimmed by biotite. Quartz occurs in 2 mm-thick aggregates and shows subgrain development.

Latitude: 41.64183

Longitude: -70.56901

Elevation of well site (m): 25.76

Elevation of the upper
bedrock surface (m): -46.48

Elevation of the
top of casing (m): 25.63

Total thickness of strata
penetrated by the well (m): 74.68

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