SAMPLE_ID:  95MW0208

DATE: 8/5/2002

FELSIC MYLONITE

Sample 95MW0208 is a quartz dioritic mylonite containing plagioclase (70%), quartz (20%), sericite (5%), K-feldspar (2%), chlorite (2%), epidote (1%), and trace oxides and sphene. Plagioclase is extremely seritized and shows undulose extinction. Quartz is dramatically recrystallized to show elongated grains and micro scale ribbon-like textures. Non-recrystallized quartz shows subgrain development and undulose extinction. K-feldspar may be antiperthitic in origin, and exhibits tartan twinning in larger grains. Chlorite probably has replaced biotite. Sphene shows brittle fracturing, which probably occurred during mylonitization. 

Latitude: 41.61484

Longitude: -70.5502

Elevation of well site (m): 12.36

Elevation of the upper
bedrock surface (m): -76.03

Elevation of the
top of casing (m): 13.13

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

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