Table T3. Details and explanations for thin sections with two or three domains, Hole U1415J.
|
Core, section, interval (cm) |
Thin section number | Lithologic interval | Rock name | Rock comment | Nature of domains | Contact |
Number of domains |
Igneous domain |
Domain lithology name |
|---|---|---|---|---|---|---|---|---|---|
| 345-U1415J- | |||||||||
| 3R-1W, 73–75 (Piece 14) | 32 (image) | 10 |
Clinopyroxene oikocryst- bearing olivine gabbro |
Contains two different lithologies |
Contact between two lithologies |
Sutured | 2 | 1 | Olivine gabbro |
| 2 | Oikocryst olivine gabbro | ||||||||
| 5R-1W, 117–120 (Piece 17B) | 37 (image) | 24 |
Clinopyroxene oikocryst- bearing troctolite |
Oikocryst and matrix were described as two different domains |
Oikocrysts/Matrix | Sutured | 2 | 1 | Troctolite matrix |
| 2 | Clinopyroxene oikocryst | ||||||||
| 5R-1W, 138–141 (Piece 18) | 38 (image) | 27/28 |
Olivine gabbro/ Orthopyroxene- bearing gabbro |
Contact between two lithologic intervals |
Contact between two lithologic intervals |
Sutured | 2 | 1 | Olivine gabbro |
| 2 |
Orthopyroxene-bearing, olivine-bearing gabbro olivine-bearing |
||||||||
| 7G-1W, 28–31 (Piece 5) | 40 (image) | G20 |
Clinopyroxene oikocryst- bearing troctolite/ Gabbronorite |
Contact between troctolite and gabbronorite; clinopyroxene oikocryst-bearing |
3 | 1 | Troctolite | ||
| 2 |
Clinopyroxene oikocryst- bearing troctolite |
||||||||
| 3 | Gabbronorite | ||||||||
| 7G-1W, 35–38 (Piece 6) | 41 (image) | G22 |
Clinopyroxene oikocryst- bearing olivine gabbro |
Contains a 2 cm elongated clinopyroxene oikocryst |
Oikocrysts/Matrix | Sutured | 2 | 1 | Olivine gabbro |
| 2 | Clinopyroxene oikocryst | ||||||||
| 7G-1W, 91–94 (Piece 14) | 42 (image) | G30 |
Troctolite/Clinopyroxene oikocryst-bearing gabbro |
Contains two different lithologies |
Contact between two lithologies |
Sutured | 2 | 1 | Troctolite |
| 2 |
Clinopyroxene oikocryst- bearing gabbro |
||||||||
| 7G-1W, 55–56 (Piece 8) | 45 (image) | G24 |
Clinopyroxene oikocryst- bearing olivine gabbro |
Oikocryst and matrix were described as two different domains |
Oikocrysts/Matrix | 2 | 1 | Troctolite | |
| 2 | Clinopyroxene oikocryst | ||||||||
| 8R-1W, 34–37 (Piece 7) | 46 (image) | 37 |
Clinopyroxene oikocryst- bearing troctolite |
Oikocryst and matrix were described as two different domains |
Oikocrysts/Matrix | Sutured | 2 | 1 | Troctolite |
| 2 | Clinopyroxene oikocryst | ||||||||
| 8R-1W, 73–76 (Piece 13) | 47 (image) | 38 |
Clinopyroxene oikocryst- bearing troctolite |
Oikocryst and matrix were described as two different domains |
Oikocrysts /Matrix | Sutured | 2 | 1 | Troctolite |
| 2 | Clinopyroxene oikocryst | ||||||||
| 8R-2W, 79–82 (Piece 8) | 51 (image) | 41 |
Clinopyroxene oikocryst- bearing olivine gabbro |
Oikocryst and matrix were described as two different domains |
Oikocrysts/Matrix | Sutured | 2 | 1 | Olivine gabbro |
| 2 | Clinopyroxene oikocryst | ||||||||
| 8R-2W, 112–115 (Piece 9) | 52 (image) | 42/43 |
Olivine-bearing gabbro/ Olivine gabbro |
Contact between two lithological intervals |
Contact between two lithologic intervals |
Sutured | 2 | 1 | Olivine-bearing gabbro |
| 2 | Olivine gabbro | ||||||||
| 8R-3W, 26–29 (Piece 5) | 53 (image) | 47 |
Clinopyroxene oikocryst- bearing troctolite |
Oikocryst and matrix were described as two different domains |
Oikocrysts/Matrix | Sutured | 2 | 1 | Troctolite |
| 2 | Clinopyroxene oikocryst | ||||||||
| 10R-1W, 53–55 (Piece 6B) | 58 (image) | 58 |
Contact between troctolite and gabbro |
Rock contains two different lithologies; moderately altered |
Two lithologies | Gradational | 2 | 1 | Troctolite |
| 2 | Gabbro | ||||||||
| 15G-1W, 46–49 (Piece 6) | 69 (image) | G51 |
Clinopyroxene oikocryst- bearing troctolite |
Oikocryst and matrix were described as two different domains |
Oikocrysts/Matrix | Sutured | 2 | 1 | Troctolite |
| 2 | Clinopyroxene oikocryst | ||||||||
| 18R-1W, 67–69 (Piece 9) | 71 (image) | 71 |
Completely altered chromitite |
Protolith was probably chomitite/dunite/ troctolite association; some grains of chromian spinel preserved |
Two lithologies | Sutured | 2 | 1 |
Heavily altered chromitite |
| 2 | Heavily altered troctolite | ||||||||
| 18R-1W, 141–143 (Piece 17B) | 72 (image) | 73 | Troctolite |
Contains a layer richer in plagioclase |
Modal and grain size | Sutured | 2 | 1 | Troctolite |
| 2 | Plagioclase-rich troctolite | ||||||||
| 19R-1W, 64–67 (Piece 10) | 74 (image) | 75 |
Cataclasite with basaltic fragment |
Eventually tectonized gabbro/dike contact |
Two or more lithologies | Tectonic | 2 | 1 | Basalt |
| 2 | Cataclasite | ||||||||
| 21R-1W, 103–107 (Piece 14) | 79 (image) | 79 |
Cataclasite mainly consisting of olivine gabbro |
With basaltic fragment | Two lithologies | Tectonic | 2 | 1 | Olivine gabbro |
| 2 | Basalt | ||||||||
| 23R-1W, 52–53 (Piece 8) | 83 (image) | 86 |
Cataclasite with fragments of gabbro |
Primary mode estimation not possible |
3 | 1 | Cataclasite | ||
| 2 | Cataclasite | ||||||||
| 3 | Cataclasite | ||||||||
| 25G-1W, 11–15 (Piece 2) | 84 (image) | G66 | Oikocryst gabbro |
Oikocryst and matrix were described as two different domains |
Oikocrysts/Matrix | Sutured | 2 | 1 | Troctolite |
| 2 | Clinopyroxene oikocryst | ||||||||
| 25G-1W, 32–35 (Piece 5) | 85 (image) | G69 | Olivine gabbro |
With a domain poor in olivine |
Two or more lithologies | Sutured | 2 | 1 | Olivine gabbro |
| 2 | Olivine-bearing gabbro | ||||||||
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