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Table T2. Summary of lithologic intervals and their classification into units, Hole U1415I.

Unit Description Core, section, interval (cm) Depth (mbsf) Pieces Lithologic interval Contact type Contact definition Complete lithology name Modal grain size
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    345-U1415I-
I Surficial rubble   1R-1A, 0–12 0.00 0.12 1, 2, 3 1 Not recovered   Orthopyroxene-bearing gabbro Medium grained
1R-1A, 12–15 0.12 0.15 4 2 Not recovered   Gabbro Medium grained
2R-1A, 0–57.5 11.70 12.28 1, 2, 3, 4, 5,
6, 7, 8, 9,
10, 11 		3 Not recovered   Orthopyroxene-bearing olivine gabbro Medium grained
3R-1A, 0–150 17.70 19.20   4 Not recovered   Drilling-induced disaggregated gabbro  
3R-2A, 0–150 19.20 20.70   5 Not recovered   Drilling-induced disaggregated gabbro  
3R-3A, 0–150 20.70 22.20   6 Not recovered   Drilling-induced disaggregated gabbro  
3R-4A, 0–14 22.20 22.34 1 7 Not recovered   Drilling-induced disaggregated gabbro  
3R-4A, 14–37 22.34 22.57 2, 3, 4 8 Not recovered   Gabbro Medium grained
II Layered Gabbro
Series   		4R-1A, 0–5 27.00 27.05 1 9 Not recovered   Anorthositic olivine gabbro Medium grained
4R-1A, 5–10 27.05 27.10 2 10 Not recovered   Olivine gabbro Coarse grained
4R-1A, 10–13.5 27.10 27.14 2 11 Not recovered   Olivine-bearing gabbronorite Medium grained
4R-1A, 13.5–19.5 27.14 27.20 3 12 Not recovered   Orthopyroxene-bearing olivine gabbro Medium grained
4R-1A, 19.5–24 27.20 27.24 4 13 Not recovered   Olivine gabbro Medium grained
4R-1A, 24–33 27.24 27.33 5 14 Not recovered   Orthopyroxene-bearing olivine gabbro Medium grained
4R-1A, 33–38 27.33 27.38 6 15 Not recovered   Troctolitic olivine gabbro Medium grained
4R-1A, 38–63 27.38 27.63 6, 7, 8 16 Modal, textural Sharp Olivine-bearing gabbronorite Medium grained
4R-1A, 63–74 27.63 27.74 8 17 Modal, textural Sharp Olivine gabbro Medium grained
4R-1A, 74–76 27.74 27.76 8 18 Modal, textural, grain size Sharp Troctolite Coarse grained
4R-1A, 76–87 27.76 27.87 8 19 Modal, textural, grain size Sharp Olivine-bearing gabbronorite Medium grained
4R-1A, 87–104 27.87 28.04 8, 9 20 Modal Sharp Orthopyroxene-bearing olivine gabbro Medium grained
4R-1A, 104–110 28.04 28.10 9 21 Modal, textural Sharp Olivine-bearing gabbronorite Medium grained
4R-1A, 110–143 28.10 28.43 10, 11, 12 22 Not recovered   Gabbronorite Medium grained
4R-2A, 0–8.5 28.43 28.52 1 23 Not recovered   Olivine-bearing gabbro Medium grained
4R-2A, 8.5–13 28.52 28.56 2 24 Not recovered   Clinopyroxene-bearing troctolite Medium grained
4R-2A, 13–17 28.56 28.60 3 25 Not recovered   Anorthositic gabbro Medium grained
Ghost
cores 		Samples recovered
from previously
core intervals while
cleaning the hole 		5G-1A, 0–4 6.00 6.04 1 G1 Not recovered   Olivine gabbro Medium grained
5G-1A, 4–12.5 6.04 6.13 2 G2 Not recovered   Completely altered felsic material Coarse grained
5G-1A, 12.5–18 6.13 6.18 3 G3 Not recovered   Clinopyroxene oikocryst-bearing troctolite Coarse grained
5G-1A, 18–24.5 6.18 6.25 4 G4 Not recovered   Anorthositic gabbro Medium grained

Unit Description Core, section, interval (cm) Grain
size rank 		Grain size
distribution 		Texture Texture modifier Texture comment Alteration description
    345-U1415I-
I Surficial rubble   1R-1A, 0–12 2 Equigranular Granular (BJ84)     Slight to moderate
1R-1A, 12–15 2 Equigranular Granular (BJ84)     Slight to moderate
2R-1A, 0–57.5 2 Equigranular Granular (BJ84)   Piece 3 has a seriate grain
size distribution and a
poikilitic-granular texture. 		High to complete
3R-1A, 0–150            
3R-2A, 0–150            
3R-3A, 0–150            
3R-4A, 0–14            
3R-4A, 14–37 2 Equigranular Granular (BJ84)     Moderate
II Layered Gabbro
Series 		4R-1A, 0–5 2 Equigranular Poikilitic-granular     High
4R-1A, 5–10 3 Seriate Poikilitic-granular Foliated   Moderate
4R-1A, 10–13.5 2 Equigranular Granular (BJ84)     Moderate
4R-1A, 13.5–19.5 2 Seriate Poikilitic-granular     Moderate
4R-1A, 19.5–24 2 Seriate Granular (BJ84)     High
4R-1A, 24–33 2 Equigranular Granular (BJ84)     Moderate
4R-1A, 33–38 2 Equigranular Granular (BJ84) Foliated   Moderate
4R-1A, 38–63 2 Equigranular Granular (BJ84) Foliated   Moderate
4R-1A, 63–74 2 Equigranular Granular (BJ84) Foliated   Moderate
4R-1A, 74–76 3 Equigranular Granular (BJ84) Foliated   Moderate
4R-1A, 76–87 2 Equigranular Granular (BJ84)     Moderate
4R-1A, 87–104 2 Equigranular Granular (BJ84) Foliated   Moderate
4R-1A, 104–110 2 Equigranular Granular (BJ84)     Moderate
4R-1A, 110–143 2 Equigranular Granular (BJ84)     High
4R-2A, 0–8.5 2 Equigranular Granular (BJ84)     High
4R-2A, 8.5–13 2 Seriate Poikilitic-granular Foliated   Moderate
4R-2A, 13–17 2 Equigranular Granular (BJ84)     Moderate
Ghost
cores 		Samples recovered
from previously
core intervals while
cleaning the hole 		5G-1A, 0–4 2 Seriate Poikilitic-granular     Moderate
5G-1A, 4–12.5 3 Seriate Pegmatitic Alteration vein?   Complete
5G-1A, 12.5–18 3 Equigranular Granular (BJ84)     Slight
5G-1A, 18–24.5 2 Equigranular Granular (BJ84)     Complete

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