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Table T5. Background alteration modes observed in thin section.
|
Olivine alteration relative proportions
|
|
Unit
|
Number of
samples |
Igneous
mode |
Alteration
(%) |
Serpentine
(%) |
Clay
minerals
(%)
|
Amphibole
(%) |
Talc
(%)
|
Chlorite
(%)
|
Other
(%)
|
|
|
|
|
II
|
38
|
13
|
55
|
26
|
17
|
17
|
17
|
20
|
2
|
|
|
|
|
III
|
18
|
30
|
77
|
54
|
15
|
12
|
3
|
14
|
2
|
|
|
|
|
Clinopyroxene alteration relative proportions
|
|
Unit
|
Number of
samples |
Igneous
mode |
Alteration
(%) |
Pale
amphibole
(%) |
Clay
minerals
(%)
|
Green
amphibole
(%) |
Secondary
clinopyroxene
(%) |
Chlorite
(%)
|
Other
(%)
|
|
|
|
|
II
|
38
|
19
|
27
|
51
|
3
|
29
|
5
|
11
|
1
|
|
|
|
|
III
|
18
|
8
|
36
|
63
|
13
|
8
|
—
|
10
|
6.5
|
|
|
|
|
Orthopyroxene alteration relative proportions
|
|
Unit
|
Number of
samples |
Igneous
mode |
Alteration
(%) |
Pale and
green
amphibole
(%) |
Talc
(%)
|
Chlorite
(%)
|
Serpentine
(%)
|
Clay
minerals
(%)
|
Other
(%)
|
|
|
|
|
II
|
38
|
3
|
41
|
68
|
5
|
13
|
6
|
6
|
2
|
|
|
|
|
III
|
18
|
10
|
10
|
20
|
80
|
—
|
—
|
—
|
—
|
|
|
|
|
Plagioclase alteration relative proportions
|
|
Unit
|
Number of
samples |
Igneous
mode |
Alteration
(%) |
Amphibole
|
Epidote/
clinozoisite
(%) |
Chlorite
(%)
|
Clay
|
Prehnite
(%)
|
Garnet
|
Secondary
plagioclase
(%) |
Zeolite
(%)
|
Carbonate
(%) |
|
II
|
38
|
64
|
25
|
3
|
<1
|
44
|
4
|
45
|
—
|
1
|
1
|
3
|
|
III
|
18
|
61
|
60
|
2
|
2
|
31
|
4
|
60
|
1
|
0.4
|
0
|
0
|
|
Overall alteration and relative proportions of alteration minerals
|
|
Unit
|
Number of
samples |
Alteration
(%) |
Amphibole
(%) |
Chlorite
(%)
|
Prehnite
(%)
|
Secondary
plagioclase
(%) |
Serpentine
(%)
|
Talc
(%)
|
Clay
minerals
(%)
|
Zeolite
(%)
|
Carbonate
(%) |
|
|
II
|
38
|
29
|
23.1
|
31.7
|
24.5
|
0.7
|
6.8
|
4.5
|
6.9
|
0.5
|
1.5
|
|
|
III
|
18
|
63.0
|
10.7
|
21.3
|
31.0
|
0.2
|
17.4
|
12.3
|
7.0
|
—
|
—
|
|
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