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Event details
| Voyage: | IN2019_V04 [details] |
| When: | 2019-08-25 15:45:57 UTC |
| Log: | Geology_Rocks_in2019_v04 |
| Equipment: | Not specified |
| Position: | Latitude: -13.3516 Longitude: 158.9779 Position from underway logging |
| Sample number: | in2019_v04_D41-004 |
| Dredge: | D41 |
| Sample Number Assigned: | Yes |
| Sample photographed (include scale and sample number): | Yes |
| Number of photos: | 4 |
| Sample sawn: | Yes |
| Sticker: | yes |
| Colour: | black | grey-light | brown | yellow |
| Composition: | mafic |
| Alteration: | Mn crust | altered |
| Phenocryst mineralogy: | pyroxene |
| Phenocryst abundance (%): | 100 |
| Phenocryst size range (mm): | 0.5-3 mm |
| Groundmass: | crystalline |
| Features: | other |
| Vesicle abundance: | absent |
| Vesicle Filling (%): | 0 |
| Sample bagged: | yes |
| Bucket number: | 74 |
| Rock name: | Massive, slightly altered dolerite |
| Comments: | 0.5 mm crust. Very similar to D41-002, 003, 005. Abundant play laths now largely altered to orange mineral. Black pyroxene crystals. Some unusual pink/ref patches that look to be alteration approx 1-7 mm in diameter. Some fresh plag. |