Table 1. Summary of igneous petrology, Leg 187. (See table note.)
| Site | Age (Ma) | Hole | Mantle domain | Length (m) | Recovery (wt%) | Igneous lithology | Type of deposit | Unit description | Alteration | ||||
| Cored | Recovered | Aphyric | Sparsely pl-ol phyric | Moderately pl-ol phyric | Breccia | ||||||||
| 1152 | ~25 | A | Transitional Pacific |
11.20 | 0.60 | 5.00 | X | Talus | Unit 1: Aphyric basalt | Slight | |||
| B | Transitional Pacific |
23.70 | 3.60 | 15.15 | (x) | X (cpx) | Talus Talus |
Unit 1: Aphyric basalt Unit 2: Sparsely to moderately pl-ol-cpx phyric basalt |
Slight | ||||
| Total: | 4.20 | 12.03 | |||||||||||
| 1153 | ~28 | A | Pacific | 7.30 | 1.77 | 24.25 | X | Pillows | Unit 1: Aphyric basalt | Slight | |||
| Total: | 1.77 | 24.25 | |||||||||||
| 1154 | ~28 | A | Pacific | 34.40 | 9.42 | 28.90 | X | Pillows | Unit 1: Moderately pl-ol phyric basalt | Slight | |||
| Total: | 9.42 | 28.90 | |||||||||||
| 1155 | ~24.5 | A | Transitional Pacific |
26.20 | 2.34 | 8.93 | X | X | Pillows Talus |
Unit 1: Moderately pl-ol phyric basalt Unit 2: Aphyric basalt with moderately pl-ol phyric basalt (i.e., basaltic rubble) |
Slight to moderate | ||
| B | 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 | |||||||||||
| 1156 | ~22 | A | 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 | |
| B | 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 | |||||||||||
| 1157 | ~22.5 | A | 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 | |
| B | Indian | 40.40 | 11.70 | 28.96 | X | Pillows | Unit 1: Moderately pl-ol phyric basalt | Slight to moderate | |||||
| Total: | 14.62 | 25.74 | |||||||||||
| 1158 | ~21 | A | Pacific | 14.40 | 0.85 | 5.90 | X | X | Rubble (pillows) | Unit 1: Aphyric to sparsely ol-pl phyric basalt | Slight to moderate | ||
| B | 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 | ||||
| C | Pacific | 9.90 | 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 | ||||
| Total: | 4.06 | 10.33 | |||||||||||
| 1159 | ~14 | A | Pacific | 27.70 | 7.96 | 28.74 | X | X (Si) | Pillows | Unit 1: Aphyric basalt (+ hyaloclastites) | Slight to moderate | ||
| Total: | 7.96 | 28.74 | |||||||||||
| 1160 | ~21.5 | A | Pacific | 5.10 | 0.43 | 8.43 | X | X | Rubble (pillows) | Unit 1: Aphyric basalt | Slight to moderate | ||
| B | 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) |
Slight to moderate Slight Slight to moderate Slight Slight to moderate Slight Slight to moderate |
||||
| Total: | 13.44 | 26.77 | |||||||||||
| 1161 | ~19 | A | 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 |
| B | 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 | |||||||||||
| 1162 | ~18 | A | Pacific | 31.40 | 2.58 | 8.22 | (x) | (x) | X (Dc) | Fault Breccia? | Unit 1: Mixed igneous clasts (metabasalt) Unit 2: Dolomite-cemented breccia (basalt, metadiabase, cataclasite) |
High | |
| B | 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 | |||
| Total: | 12.52 | 13.86 | |||||||||||
| 1163 | ~16 | A | 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 | |||||||||||
| 1164 | ~17 | A | Transitional Pacific |
8.50 | 0.97 | 11.41 | X (cpx) | Rubble? | Unit 1: Aphyric basalt (pl-cpx microphenocryst) | Slight to moderate | |||
| B | 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 | |||||||||||