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Event details
| Voyage: | IN2019_V04 [details] |
| When: | 2019-08-13 09:43:18 UTC |
| Log: | Geology_Rocks_in2019_v04 |
| Equipment: | Not specified |
| Position: | Latitude: -19.4269 Longitude: 155.2827 Position from underway logging |
| Sample number: | in2019_v04_D11_006 |
| Dredge: | D11 |
| Sample Number Assigned: | Yes |
| Sample photographed (include scale and sample number): | Yes |
| Number of photos: | 3 |
| Sample sawn: | Yes |
| Sticker: | yes |
| Colour: | black | grey-light | brown |
| Composition: | mafic |
| Phenocryst mineralogy: | feldspar |
| Phenocryst abundance (%): | 25 |
| Phenocryst size range (mm): | 0.5-3 |
| Groundmass: | microcrystaline |
| Features: | volcanic brecciated |
| Vesicle abundance: | 10-30% |
| Vesicle Filling (%): | 10 |
| Vesicle fill: | zeolite, manganese-oxide |
| Alteration: | Mn crust | altered |
| Grain size: | sand (<2 mm) | pebble (2-64 mm) |
| Grain shape: | mixture |
| Sorting: | poor |
| Components: | crystals | volcanic vesicular |
| Sample bagged: | yes |
| Bucket number: | 21 |
| Rock name: | Altered poorly-sorted polymictic volcanic breccia |
| Comments: | Similar to IN2019-v04-D11-005. Manganese-oxide and zeolite filled vesicles - alligned with some shearing. Large basalt clast (60mm), lots of smaller volcanic clasts, unidentified. |