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b
a
d
c
7
7
6
6
5
5
4
4
3
3
2
2
1
1
0
0
4
5
6
Log (Value)
7
8
e
f
h
g
8
8
7
7
6
6
5
5
4
4
3
3
2
2
5
6
7
8
Fig. 11.26 Frequency distributions of local tin and arsenic singularities and concentration values.
(a) Histogram of tin singularities shown in Fig.
11.23c
.(b)Student's
t
-value for contrast (
C
)
expressing degree of spatial correlation between binary pattern and point pattern (consisting of
11 tin deposits shown in Fig.
11.23a
). (c) Cumulative frequency plot corresponding to histogram
(Fig. 11.26a);
N
(
; base of logarithms is 10.
Straight-line was fitted by ordinary least squares method (Log
10
N
regressed on
>α
) is number of units with local singularities exceeding
α
);
R
2
¼
multiple
correlation coefficient squared. (d) C-A (concentration-area) plot showing cumulative area versus tin
concentration value; base of logarithms is e. (e) Histogram of As singularities (shown in Fig.
11.23b
).
(f)Student's
t
-value for arsenic. The peak near
α
¼
1.7 indicates positive spatial correlation between
arsenic singularities and tin deposits. (g) Pattern for arsenic corresponding to pattern for tin in
Fig.
11.23c
.(h) Arsenic C-A plot (Source: Cheng and Agterberg
2009
,Fig.4)
α
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