Core, section,
interval (cm) |
Depth
(mbsf) |
Subunit
|
Name
|
Texture
|
Groundmass plagioclase
|
||
|---|---|---|---|---|---|---|---|
|
Percentage
(%) |
Size
(mm) |
Alteration
|
|||||
| Igneous rocks: |
|
|
|
|
|
|
|
| 198-1213B- |
|
|
|
|
|
|
|
| 28R-1, 45-48 | 448.25 | IVA | Diabase | Intersertal to intergranular to glomeroporphyritic | 45 | 0.76*, 0.29† | To smectite along fractures (minor) |
| 28R-3, 143-145 | 451.97 | IVA | Diabase | Subophytic to intersertal | 40 | 1.6*, 0.6† |
|
| 30R-2, 27-30 | 458.91 | IVA | Diabase | Intergranular to intersertal to subophytic | 45 | 1.8*, 0.5† | To smectite along fractures (minor) |
| 30R-4, 39-41 | 461.94 | IVA | Diabase (basalt?) | Intersertal to intergranular | 45 | 1.6*, 0.38† | To smectite along fractures (minor) |
| 31R-1, 7-10 | 467.07 | IVB | Basalt | Seriate to slightly glomeroporphyritic | 20 | 1.5*, 0.29†, some swallow-tail crystals | To smectite (moderate) |
| 31R-3, 73-75 | 470.44 | IVB | Diabase | Subophytic | 48 | 1.5*, 0.67† | To smectite along fractures (minor) |
| 32R-3, 72-75 | 480.26 | IVB | Diabase | Subophytic to intergranular | 50 | 1.4*, 0.82† (some spherulites) | To smectite along fractures |
| 33R-6, 106-108 | 492.79 | IVC | Diabase | Intergranular (subophytic? prior to alteration) | 45 (5% large phenocrysts) | 0.5*, 0.34† (some spherulites) | To smectite along cleavage and fractures (moderate) |
|
Core,
section,
interval (cm) |
Depth
(mbsf) |
Groundmass
pyroxene
|
Groundmass
olivine
|
Groundmass
opaques
|
|||||
|---|---|---|---|---|---|---|---|---|---|
|
Percentage
(%)
|
Size (mm)
|
Alteration
|
Percentage
(%)
|
Size
(mm) |
Alteration
|
Percentage
(%)
|
Size
(mm) |
||
| Igneous rocks: | |||||||||
| 198-1213B- | |||||||||
| 28R-1, 45-48 | 448.25 | 7 | 0.11† | 8 | <0.67 | 10 | 0.05† | ||
| 28R-3, 143-145 | 451.97 | 20 | 0.2† | 10 | 0.5† | (Some inclusions) | 10 | 0.19† | |
| 30R-2, 27-30 | 458.91 | 20 | <0.57 (wide range) | 5 | <0.8 (wide range) | (Some inclusions) | 10 | 0.10† | |
| 30R-4, 39-41 | 461.94 | 27 | <0.6 | To smectite (relict cleavage?) | 3 | <0.6 | To smectite? | 5 | 0.08† |
| 31R-1, 7-10 | 467.07 | 2 | 0.38† | To smectite (relict cleavage?) | 3 | <0.67 | (Some inclusions) | 5 | |
| 31R-3, 73-75 | 470.44 | 2 | 0.66† | To clay + carbonate(?) | 30 | 0.66† | 10 | 0.11† | |
| 32R-3, 72-75 | 480.26 | 10 | 0.5*, 0.29† | 2 | 0.5*, 0.29† | 5 | 0.17† (some skeletal) | ||
| 15 | Pyroxene and olivine altered to smectite | ||||||||
| 33R-6, 106-108 | 492.79 | 5 | Remnants | ? | 5 | 0.06† (some skeletal) | |||
| 35 | Pyroxene and olivine(?) altered to smectite | ||||||||
|
Core,
section,
interval (cm) |
Depth
(mbsf) |
Groundmass
glass
|
Phenocrysts
|
Veins
|
Vesicles
|
Glomerophenocrysts
|
|
|---|---|---|---|---|---|---|---|
|
Percentage
(%) |
Alteration
|
Type
|
|||||
| Igneous rocks: | |||||||
| 198-1213B- | |||||||
| 28R-1, 45-48 | 448.25 | 30 | Devitrified, altered to smectite, altered to carbonate | None | Carbonate and green clay filled | None | Some |
| 28R-3, 143-145 | 451.97 | 20 | Devitrified, some fine plagioclase microlites | None | None | Amygdules or crystals altered to carbonate | None |
| 30R-2, 27-30 | 458.91 | 30 | Slightly devitrified (dark brown) | Brown clay filled | Plucked? | ||
| 30R-4, 39-41 | 461.94 | 20 | Altered to clay and devitrified (dark brown) | None | None | None | None |
| 31R-1, 7-10 | 467.07 | 70 | Devitrified/altered fibrous bundles of microlites | Plagioclase | Smectite filled | >1-mm dark patches amygdules filled with smectite(?) | Some |
| 31R-3, 73-75 | 470.44 | 5 | Devitrified/altered | Carbonate, smectite, and quartz filled | None | Large (1.2 mm) composed of plagioclase crystals 2 mm and less + pyroxene + opaques | |
| 32R-3, 72-75 | 480.26 | 20 | Devitrified/altered | None | None | None | None |
| 33R-6, 106-108 | 492.79 | 5 | Altered to clay minerals | Plagioclase (6.0-1.0 mm) severely altered to smectite and albite(?) | Carbonate and smectite filled | ||
Note: * = maximum, † = average.