sgr ms thesis - University of Maine

Clast circularity data were produced in NIH ImageJ using equation (5.11).
Clast frequency plots were produced using a 0.05 circularity interval for 0.1-1cm,
1-10cm, and >10cm clast radius intervals.
6.3. Data
6.3.1. Clast Size Distribution (CSD) Data
A total sample size of 14 imaged outcrops yielding 12,732 clasts with size
ranges spanning 3 orders of magnitude (0.1-40cm) was used for CSD analysis.
Types 1-3 of the Shatter Zone are represented and results are shown in Figures
6.10 and 6.11. Data are shown in Table 6.1. Type 1 Shatter Zone shows a
bifractal distribution, or two observed power law distributions divided by a slope
breakpoint, with an average D s value of 3.027 above clast radius of 1.25cm and
1.5 for clasts below. The R 2 values for these two distributions are 0.9868 above
the breakpoint and 0.9778 below. The curve for Type 1 represents 1,519 clasts
from four outcrop grids with a size range of 0.1-23.4cm. Type 1 has 16.1%
average matrix component by area.
Type 2 has an average D s value of 3.166 above clast radius of 1.52 cm
and D s = 1.875 below. The bifractal R 2 values for the Type 2 distribution are
0.9932 above and 0.9865 below the breakpoint. The total sample size for Type 2
is 5538 outlined clasts from four outcrop with a size range of 0.1-13.02cm. Type
2 has 34.4% average matrix component by area.
Clast size populations in Type 3 Shatter Zone are divided by rock type due
to the marked increase in diorite dike clast abundance. These results show the
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