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Event details
| Voyage: | IN2019_V04 [details] |
| When: | 2019-08-19 12:13:11 UTC |
| Log: | Geology_Rocks_in2019_v04 |
| Equipment: | Not specified |
| Position: | Latitude: -14.4481 Longitude: 155.8624 Position from underway logging |
| Sample number: | in2019_v04_D29_003 |
| Dredge: | D29 |
| Sample Number Assigned: | Yes |
| Sample photographed (include scale and sample number): | Yes |
| Number of photos: | 7 |
| Sample sawn: | Yes |
| Sticker: | yes |
| Colour: | black | white | brown |
| Composition: | mafic |
| Phenocryst mineralogy: | feldspar |
| Phenocryst abundance (%): | 20 |
| Phenocryst size range (mm): | 0.5-3 |
| Groundmass: | altered |
| Vesicle abundance: | 10-30% |
| Vesicle Filling (%): | 50 |
| Vesicle fill: | calcite |
| Alteration: | Mn crust | altered |
| Sample bagged: | yes |
| Bucket number: | 38 |
| Rock name: | Feldspar-phyric vesicular basalt |
| Comments: | Large vesicles (1-30mm). Groundmass is rusted red in colour, suggesting Fe-oxide content. Groundmass has red spotted alteration. Feldspar crystals are small, mostly <1mm. Abundant plagioclase laths in groundmass? |