Previous   |    Close   |    Next

Table T6. Plagioclase alteration observed in thin section, Hole U1415P.

Core, section,
interval (cm) 		Thin
section number 		Depth (mbsf) Rock name Plagioclase original mode (%) Alteration (%)
Plagioclase altered Plagioclase replaced by green amphibole Plagioclase replaced by pale/colorless amphibole Plagioclase replaced by epidote/zoisite Plagioclase replaced by chlorite Plagioclase replaced by clay minerals Plagioclase replaced by prehnite Plagioclase replaced by garnet Plagioclase replaced by secondary plagioclase Plagioclase replaced by zeolite Plagioclase replaced by other
Top Bottom
345-U1415P-
4G-1, 10–13 (Piece 3) 98 12.6 12.63 Gabbronorite 65 2       50 45         5
4G-1, 10–13 (Piece 3) 98 12.6 12.63 Olivine gabbro 70 5       50 45         5
3R-1, 31–34 (Piece 7) 96 12.81 12.84 Gabbro 45 5       100            
4G-1, 41–43 (Piece 6) 99 12.91 12.93 Gabbro 79 10       40   20       40
4G-1, 57–60 (Piece 7) 100 13.07 13.1 Oikocryst gabbronorite 65 30       40   60        
3R-1, 120–123 (Piece 20A) 97 13.7 13.73 Olivine gabbro 55 15     1 70   10   19    
4G-1, 120–125 (Piece 10) 101 13.7 13.75 Troctolite 79 5       37   60       3
4G-2, 2–3 (Piece 1) 102 13.93 13.94 Olivine gabbro 55 25       20   80        
5R-1, 37–38 (Piece 5) 103 18.47 18.48 Pyroxene-bearing troctolite 80 10       50   50        
5R-2, 52–53 (Piece 6) 104 20.04 20.05 Oikocryst gabbro 55 40       30   70        
6R-1, 47–51 (Piece 6) 105 23.07 23.11 Olivine gabbro 50 20       40 10 50        
6R-1, 58–61 (Piece 6) 106 23.18 23.21 Olivine gabbro 45 50       80   5   5   10
6R-1, 58–61 (Piece 6) 106 23.18 23.21 Olivine gabbro 45 15       5   95        
6R-1, 101–103 (Piece 7C) 107 23.61 23.63 Olivine gabbro 53 50       60   30       10
6R-2, 31–34 (Piece 3) 108 24.315 24.345 Gabbro 56 40       40   60        
6R-2, 38–41 (Piece 4) 109 24.385 24.415 Metagabbro 65 40       30   70        
6R-2, 90–91 (Piece 11) 110 24.905 24.915 Gabbro 60 10       25   75        
6R-2, 119–122 (Piece 14) 111 25.195 25.225 Gabbro 60 10       40 35 20       5
6R-2, 119–122 (Piece 14) 111 25.195 25.225 Troctolite 79 5       40 35 20       5
7R-1, 60–62 (Piece 8A) 112 27.7 27.72 Gabbro 50 40       50   50        
7R-1, 110–112 (Piece 11C) 113 28.2 28.22 Gabbro 38 5       30   70        
7R-2, 41–44 (Piece 2) 114 28.9 28.93 Troctolite 83 10       90           10
8R-1, 3–4 (Piece 1) 115 31.43 31.44 Olivine gabbro 65 15       10   90        
8R-1, 80–83 (Piece 6) 116 32.2 32.23 Olivine gabbro 70 15       40   40   20    
9R-1, 3–4 (Piece 1) 117 36.43 36.44 Troctolite 70 20       70   30        
9R-1, 36–41 (Piece 3) 118 36.76 36.81 Gabbro 73 10       30   50       20
9R-2, 20–21 (Piece 3) 119 38.015 38.025 Troctolite 70 20       60   40        
10R-1, 60–62 (Piece 7) 120 41.6 41.62 Olivine gabbro 76 10       50   50        
10R-1, 121–134 (Piece 13) 121 42.21 42.34 Olivine gabbro 60 100   10   30   60        
10R-1, 121–134 (Piece 13) 121 42.21 42.34 Olivine gabbro 60 90 10 10   60   10   5 5  
10R-1, 137–138 (Piece 14) 122 42.37 42.38 Olivine gabbro 65 50   5   50   40       5
11R-1, 43–44 (Piece 6) 123 46.03 46.04 Gabbro 65 50       30   70        
12R-1, 5–6 (Piece 1) 124 49.75 49.76 Gabbro 70 30       50   50        
13R-1, 39–42 (Piece 5) 125 55.09 55.12 Olivine-bearing gabbro 75 10 2     43 10 5     30 10
13R-1, 113–116 (Piece 10) 126 55.83 55.86 Troctolite 70 30       40 40 15       5
14R-1, 22–25 (Piece 3) 127 59.02 59.05 Gabbro 70 20       50   50        
14R-1, 22–25 (Piece 3) 127 59.02 59.05 Troctolite 65 10 5     50   20   5   20
14R-1, 50–52 (Piece 5) 128 59.3 59.32 Olivine gabbro 65 40       20 20 60        
16R-1, 47–49 (Piece 6) 129 68.47 68.49 Troctolite 86 10       35   65        
16R-1, 100–102 (Piece 9) 131 69 69.02 Olivine gabbro 70 20   5 10 20   60   5    
16R-1, 117–120 (Piece 10) 130 69.17 69.2 Olivine gabbro 80 25       25   75        
18R-1, 31–36 (Piece 5) 132 77.61 77.66 Troctolite 45 70       20 10 70        
18R-1, 39–40 (Piece 6) 133 77.69 77.7 Troctolite 65 70       20 10 70        
20R-1, 3–6 (Piece 1) 135 82.33 82.36 Troctolite 45 75   5   80   15        
20R-1, 67–68 (Piece 5) 136 82.97 82.98 Troctolite 55 70       20 10 70        
20R-2, 59–61 (Piece 6) 137 84.27 84.29 Troctolite 65 80       20 10 70        
22R-1, 12–17 (Piece 3) 138 89.52 89.57 Troctolite 57 70       30   70        
22R-1, 60–65 (Piece 8) 139 90 90.05 Olivine gabbro 65 80   10 25 30   30 5      
22R-1, 60–65 (Piece 8) 139 90 90.05 Troctolite 30 70       10   75 15      
22R-2, 113–115 (Piece 8) 140 91.93 91.95 Ol-gabbro 30 30       30   50   20    
22R-2, 113–115 (Piece 8) 140 91.93 91.95 Troctolite 57 100         10 90        
23R-1, 19–21 (Piece 2) 141 98.99 99.01 Troctolite 55 50       50   50        
23R-1, 19–21 (Piece 2) 141 98.99 99.01 Troctolite 88 80       50   50        
23R-1, 100–103 (Piece 14) 142 99.8 99.83 Altered olivine gabbro 60 90   10   30   40       20
23R-1, 134–138 (Piece 18) 143 100.14 100.18 Troctolite 70 70       50   50        

Previous   |    Close   |    Next   |    Top of page