Previous |
Close |
Next
Table T9. Modal proportions for grain mounts, Hole U1415J.
|
Mineral
|
345-U1415J-2G-Sand, TS 27
|
345-U1415J-2G-Sand, TS 28
|
Mean mode
|
Modal
(%)
|
Reconstructed
igneous
mode |
Modal
(%)
|
Reconstructed
igneous mode |
|
Plagioclase
|
23.8
|
57.1
|
27.6
|
63.1
|
25.7
|
|
Pyroxene
|
13.0
|
31.6
|
10.3
|
25.1
|
11.7
|
|
Amphibole after pyroxene
|
14.7
|
|
10.1
|
|
12.4
|
|
Polycrystalline amphibole
|
3.5
|
|
3.1
|
|
3.3
|
|
Secondary plagioclase
|
8.7
|
|
7.8
|
|
8.2
|
|
Zeolite (including veins and plagioclase replacement)
|
2.9
|
|
3.7
|
|
3.3
|
|
Cataclasite
|
8.5
|
|
11.1
|
|
9.8
|
|
Bruised grain of plagioclase or pyroxene
|
0.0
|
|
0.2
|
|
0.1
|
|
Prehnite vein/Prehnite replacing cataclasite
|
1.7
|
|
1.7
|
|
1.7
|
|
Prehnite replacing plagioclase
|
2.9
|
|
2.3
|
|
2.6
|
|
Chlorite
|
8.7
|
|
9.3
|
|
9.0
|
|
Olivine
|
0.2
|
11.3
|
0.6
|
11.8
|
0.4
|
|
Clay
|
5.4
|
|
5.2
|
|
5.3
|
|
Epidote
|
1.7
|
|
1.2
|
|
1.4
|
|
Carbonate
|
0.2
|
|
0.2
|
|
0.2
|
|
Serpentine
|
0.0
|
|
0.4
|
|
0.2
|
|
Volcanic clasts
|
4.1
|
|
5.2
|
|
4.7
|
|
|
|
|
|
|
0.0
|
Cataclastic (excluding volcanics, including prehnite
replacing cataclasite) |
10.6
|
|
13.7
|
|
12.2
|
|
Altered phases
|
52.5
|
|
47.5
|
|
50.0
|
|
Prehnite
|
4.6
|
|
4.1
|
|
4.3
|
Igneous mode is estimated according to the following formula: plagioclase = plagioclase + secondary plagioclase + zeolite + prehnite + (cataclasite + bruised grains) × 0.7 + chlorite × 0.8 + epidote + carbonate; pyroxene (includes some orthopyroxene) = pyroxene + amphibole after pyroxene + (cataclasite + bruised grains) × 0.3; olivine = olivine + clay minerals + serpentine + polycrystalline amphibole + chlorite × 0.2. TS = thin section.
Previous |
Close |
Next |
Top of page