Table T2. Summary of igneous petrology, Leg 187.
| Age (Ma) | Hole | Mantle domain | Recovery (%) |
Igneous lithology | Deposit type | Unit name | Alteration | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Length (m) |
Aphyric | Sparsely pl-ol phyric |
Moderately pl-ol phyric |
Breccia | ||||||||
| Cored | Recovered | |||||||||||
| ~25 | 1152A | Transitional Pacific | 11.20 | 0.60 | 5.00 | X | Talus |
Unit 1: Aphyric basalt | Slight | |||
| 1152B | Transitional Pacific | 23.70 | 3.60 | 15.15 | X | (x) | X (cpx) | Talus Talus |
Unit
1: Aphyric basalt
Unit 2: Sparsely to moderately pl-ol-cpx phyric basalt |
Slight Slight |
||
| Total: | 4.20 | 12.03 | ||||||||||
| ~28 | 1153A | Pacific | 7.30 | 1.77 | 24.25 | X | Pillows |
Unit 1: Aphyric basalt | Slight | |||
| Total: | 1.77 | 24.25 | ||||||||||
| ~28 | 1154A | Pacific | 34.40 | 9.42 | 28.90 | X | Pillows |
Unit 1: Moderately pl-ol phyric basalt | Slight | |||
| Total | 9.42 | 28.90 | ||||||||||
| ~24.5 | 1155A | Transitional Pacific | 26.20 | 2.34 | 8.93 | X | (X) | X | Pillows Talus |
Unit
1: Sparsely to moderately pl-ol phyric basalt Unit 2: Aphyric basalt |
Slight to moderate | |
| 1155B | Transitional Pacific | 46.00 | 18.18 | 39.52 | X | CCV | Pillows
into sediments |
Unit 1: Moderately pl-ol phyric basalt (micritic sediments + lithics in fractures) | High
at top Slight at bottom |
|||
| Total: | 20.52 | 28.42 | ||||||||||
| ~22 | 1156A | Indian | 11.40 | 6.30 | 55.26 | (x) | X | X (Cc) CCV | Talus Pillows |
Unit
1: Breccia of phyric basalt Unit 2: Sparsely to moderately pl-ol phyric basalt with carbonate sediments |
Slight Slight to moderate |
|
| 1156B | Indian | 33.60 | 9.92 | 29.52 | X | Unknown |
Unit 1: Moderately to highly pl-ol phyric basalt | Slight to moderate | ||||
| Total: | 16.22 | 36.04 | ||||||||||
| ~22.5 | 1157A | Indian | 16.40 | 2.92 | 17.80 | X | X | X (Cc) CCV | Rubble |
Unit 1: Basaltic rubble (aphyric and pl-ol phyric basalt with carbonate sediments) | Slight to moderate | |
| 1157B | Indian | 40.40 | 11.70 | 28.96 | X | Pillows |
Unit 1: Moderately pl-ol phyric basalt | Slight to moderate | ||||
| Total: | 14.62 | 25.74 | ||||||||||
| ~21 | 1158A | Pacific | 14.40 | 0.85 | 5.90 | X | X | Rubble
(pillows) |
Unit 1: Aphyric to sparsely ol-pl phyric basalt (fine grained) | Slight to moderate | ||
| 1158B | Pacific | 15.00 | 1.60 | 10.67 | X | X | Rubble?
(flow/dike) |
Unit 1: Aphyric to sparsely ol-pl phyric basalt (fine grained) | Slight to moderate | |||
| 1158C | Pacific | 9.40 | 1.61 | 17.13 | X | X | Flow/dike? |
Unit
1: Aphyric to sparsely ol-pl phyric basalt Unit 2: Diabase (with aphyric basalt) |
Slight
to moderate Moderate to high |
|||
| Total: | 4.06 | 10.33 | ||||||||||
| ~14 | 1159A | Pacific | 27.70 | 7.96 | 28.74 | X | X (Si) | Pillows |
Unit 1: Aphyric basalt (+ hyaloclastites) | Slight to moderate | ||
| Total: | 7.96 | 28.74 | ||||||||||
| ~21.5 | 1160A | Pacific | 5.10 | 0.43 | 8.43 | X | X | Rubble (pillows) | Unit 1: Aphyric basalt | Slight to moderate | ||
| 1160B | Pacific | 45.10 | 13.01 | 28.85 | X | X | Pillows Massive Pillows Massive Pillows Massive Pillows |
Unit 1:
Aphyric basalt (microcrystalline) Unit
2: Aphyric basalt (fine grained) Unit 3: Moderately pl-(ol) basalt (microcrystalline) Unit 4: Moderately pl ± ol phyric basalt (fine grained) Unit 5: Moderately pl-ol basalt (microcrystalline) Unit 6: Moderately pl phyric basalt (fine grained) Unit 7: Aphyric basalt (microcrystalline) |
Moderate |
|||
| Total: | 13.44 | 26.77 | ||||||||||
| ~19 | 1161A | Indian | 29.30 | 4.39 | 14.98 | X | X | X | X (Si) | Talus |
Unit 1: Basaltic rubble (sparsely pl-ol phyric basalt; moderately pl-ol phyric basalt; fine-grained aphyric basalt with Si-clay cemented breccia) | Moderate
to high |
| 1161B | Indian | 8.50 | 0.86 | 10.12 | X | X | X | X (Si) | Talus |
Unit 1: Basaltic rubble (microcrystalline aphyric basalt; sparsely pl-ol phyric basalt; moderately pl-ol phyric basalt; fine-grained aphyric basalt with Si-clay cemented breccia) | Moderate
to high |
|
| Total: | 5.25 | 13.89 | ||||||||||
| ~18 | 1162A | Pacific | 31.40 | 2.58 | 8.22 | X? | ? | X? | X(Dc) |
Fault Breccia? |
Unit
: Mixed igneous clasts (metabasalt) Unit 2: Dolomite-cemented breccia (basalt, metadiabase, cataclasite) |
High
to very high High to very high |
| 1162B | Pacific | 58.90 | 9.94 | 16.88 | X? | ? | X? | X(Dc) | Fault Breccia? |
Unit
1: Dolomite limestone (with lithics) Unit 2: Dolomite-cemented breccia (aphyric and phyric basalt) |
High
to very high |
|
| Total: | 12.52 | 13.86 | ||||||||||
| ~17 | 1163A | Transitional Pacific | 47.10 | 15.70 | 33.33 | X | X | X (Cc) CCV | Pillows | Unit
1: Moderately pl-ol phyric basalt Unit 2: Aphyric basalt with carbonate sediments |
Slight
to moderate Slight to moderate |
|
| Total: | 15.70 | 33.33 | ||||||||||
| 18-19 | 1164A | Transitional Pacific | 8.50 | 0.97 | 11.41 | X (cpx) | Pillows | Unit 1: Aphyric basalt (pl-cpx microphyric) | Slight |
|||
| 1164B | Transitional Pacific | 65.70 | 10.65 | 16.21 | X | X | X | X (Si) | Rubble (pillows) | Unit 1: Basaltic rubble (aphyric and pl-ol phyric basalt with Si-clay cemented breccia) | Slight
to high |
|
| Total: | 11.62 | 15.66 | ||||||||||
| Cruise totals: | 617.20 | 137.30 | 22.25 | |||||||||
Notes: pl-ol = plagioclase-olivine; X = was definitely present; (x) = small amount was present; cpx = clinopyroxene; CCV = composite calcite vein; (Cc) = calcite; X? = metamorphosed or highly altered clasts of uncertain mineralogy; ? = uncertain due to alteration; (Dc) = dolomite. This table is also available in ASCII format.