|
Unit/ Subunit |
Core, section |
Depth (mbsf) |
Unit name | Thickness (m) | Recovery (%) | Simple | Lobed |
Average lobe thickness (m) |
Smooth glassy lobe margins |
Vesicularity | VUcr | Mai | VBcr | PV | VC | HVS |
Jointing pattern |
Phenocryst concentration in lobe interior |
Lava flow type |
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Recovered
|
Cored
|
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| 197-1203A- | ||||||||||||||||||||
| 1 | 17R-4 | 457.56 | Highly plagioclase-olivine-phyric basalt | 3.20 | 7.95 | 40 | x | 0.53 (0.25) | x | nv-spv | Cube jointing | Pillow lava | ||||||||
| 3 | 18R-2 | 465.61 | Highly plagioclase-olivine-phyric basalt | 18.00 | 24.60 | 73 | x | 0.58 (0.40) | x | nv-spv | Cube jointing | Pillow lava | ||||||||
| 5 | 25R-1 | 531.13 | Moderately plagioclase-olivine-phyric basalt | 1.81 | 1.94 | 93 | x | — | x | spv | x | x | x | Irregular | x | Pahoehoe sheet lobe | ||||
| 6 | 25R-2 | 533.07 | Sparsely plagioclase-phyric basalt | 3.23 | 4.78 | 68 | x | — | NR | nv-hiv(?) | NR | x | x | Nob | Pahoehoe sheet lobe | |||||
| 8 | 30R-1 | 570.30 | Highly plagioclase-olivine-phyric basalt | 5.38 | 18.70 | 29 | x | 0.34 (0.15) | x | nv-spv | Cube jointing | Pillow lava | ||||||||
| 11 | 32R-2 | 590.33 | Olivine-plagioclase-phyric basalt | 4.67 | 4.58 | 102 | x | — | x | nv-hiv | x | x | x | x | Irregular | x | Pahoehoe sheet lobe | |||
| 14 | 35R-4 | 616.25 | Moderately plagioclase-phyric basalt | 8.29 | 9.49 | 87 | x | 0.83 (0.34) | x | nv-spv | Cube jointing | x | Pillow lava | |||||||
| 16 | 37R-1 | 628.29 | Highly olivine-phyric basalt | 5.05 | 10.37 | 49 | x | — | x | nv-hiv | x | x | x | Irregular | x | Pahoehoe sheet lobe | ||||
| 18 | 39R-4 | 651.37 | Moderately plagioclase-olivine-phyric basalt | 10.56 | 14.57 | 72 | x | 0.56 (0.33) | x | nv-spv | Cube jointing | Pillow lava | ||||||||
| 19 | 41R-1 | 665.94 | Vesicular, moderately olivine-phyric basalt | 16.77 | 19.63 | 85 | x | 0.51 (0.35) | x | hiv | x | x | x | x | x | x | Irregular | x | Compound pahoehoe | |
| 20 | 43R-1 | 685.57 | Moderately olivine basalt | 23.47 | 36.73 | 64 | x | 0.57 (0.39) | x | spv-mov | x | x | x | x | x | Cube jointing | Hybrid pillow-pahoehoe lava | |||
| 21 | 47R-1 | 722.30 | Moderately olivine basalt(?) | 16.51 | 19.05 | 87 | x | 0.37 (0.6) | x | spv-mov | x | x | Irregular/cube jointing | Hybrid pillow-pahoehoe lava* | ||||||
| 23 | 51R-3 | 755.38 | Vesicular, sparsely olivine-plagioclase-phyric to aphyric basalt | 53.70 | 63.39 | 85 | x | 0.59 (0.44) | x | hiv | x | x | x | x | x | x | Irregular | Compound pahoehoe | ||
| 24 | 58R-3 | 818.77 | Vesicular aphyric basalt | 4.39 | 4.65 | 94 | x | x | — | NR | nv-hiv | NR | NR | Irregular | Pahoehoe sheet lobe† | |||||
| 26 | 59R-3 | 822.56 | Vesicular aphyric basalt | 21.98 | 40.55 | 54 | x | 0.85 (0.79) | x | mov-hiv | x | x | x | x | Irregular | Compound pahoehoe | ||||
| 29 | 65R-1 | 877.42 | Vesicular aphyric basalt | 3.96 | 8.38 | 47 | x | 0.40 (0.27) | x | mov-hiv | x | x | x | x | Irregular | Compound pahoehoe | ||||
| 30 | 66R-1 | 885.80 | Vesicular, sparsely plagioclase-phyric basalt | 14.80 | 23.76 | 62 | x | 0.38 (0.17) | x | hiv | x | x | x | x | x | Irregular | Compound pahoehoe | |||
| 31b | 68R-4 | 909.66 | Highly plagioclase-phyric basalt | 0.20 | 0.20 | 100 | x | — | x | nv | Cube jointing | Pillow lava | ||||||||
| Bottom of hole: | 914.60 | Total: | 215.97 | 313.32 | 69 | |||||||||||||||
| Average recovery: | 57 | |||||||||||||||||||
Notes: VUcr = vesicular upper crust, Mai = massive lobe interior, VBcr = vesicular basal crust, PV = pipe vesicles, VC = vesicle cylinders, HVS = horizontal vesicle sheet. Vesicularity: nv = nonvesicular, spv = sparsely vesicular, hiv = highly vesicular, mov = moderately vesicular. NR = not recovered. Average lobe thickness includes standard deviation in parentheses. * = largest lobe is ~14.2 m and is not included in the average. † = thick lobe, irregular jointing; small lobes, cube jointing.