80
80
80
80
80
80
80
80
KAOLINITE
a
c
b
d
CHLORITE
80
80
80
80
80
80
80
80
0
0
2000 km
2000 km
Percent
Percent
SMECTITE
0
0
2000 km
2000 km
ILLITE
Percent
Percent
10-20
10-20
< 10
< 20
< 10
< 20
20-30
20-30
20-30
20-30
30-40
30-40
30-50
50-70
40-50
40-50
> 50
> 50
> 30
> 70
60
60
60
?
?
?
?
?
?
?
?
60
80
80
80
120
120
120
140
140
140
160
180
180
180
160
160
160
160
160
140
140
140
120
120
120
100
100
100
40
40
40
20
20
20
0
0
0
0
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
20
20
20
20
20
20
20
20
0
0
0
0
0
0
0
0
20
20
20
20
20
20
20
20
60
80
120
140
180
160
160
140
120
100
40
20
Clay Minerals, Figure 2 Relative distribution of kaolinite (a), illite (b), chlorite (c), and smectite (d) in surface sediments from the world ocean as percentage in the
carbonate-free clay fraction
<2 mm (from Windom, 1976, color version extracted from Fu ¨
tterer, 2006).
90
CLAY MINERALS