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Event details
| Voyage: | IN2019_V04 [details] |
| When: | 2019-08-21 11:03:46 UTC |
| Log: | Geology_Rocks_in2019_v04 |
| Equipment: | Not specified |
| Position: | Latitude: -13.3959 Longitude: 154.0507 Position from underway logging |
| Sample number: | in2019_v04_D33-006 |
| Dredge: | D33 |
| Sample Number Assigned: | Yes |
| Sample photographed (include scale and sample number): | Yes |
| Number of photos: | 4 |
| Sample sawn: | Yes |
| Sticker: | yes |
| Colour: | black | grey-dark | red |
| Composition: | mafic |
| Alteration: | Mn crust | altered |
| Phenocryst mineralogy: | other |
| Groundmass: | altered |
| Features: | volcanic brecciated |
| Vesicle abundance: | absent |
| Grain size: | cobble (>64 mm) |
| Grain shape: | mixture |
| Sorting: | poor |
| Components: | volcanic non-vesicular |
| Cement: | calcite | other |
| Sample bagged: | yes |
| Bucket number: | 49 |
| Rock name: | Poorly sorted volcanic breccia with a rounded pebble |
| Comments: | Mn crust 20 mm thick. Clasts have veins and cracks - alteration of rocks is red - some veins are filled with white mineral which does not react with HCl acid and is softer than knife (zeolite) - may show jigsaw fitting of clasts partially - one clast (4cm long) is rounded suggesting transportation of the clast |