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Event details
| Voyage: | IN2019_V04 [details] |
| When: | 2019-08-12 23:18:38 UTC |
| Log: | Geology_Rocks_in2019_v04 |
| Equipment: | Not specified |
| Position: | Latitude: -19.4661 Longitude: 155.064 Position from underway logging |
| Sample number: | in2019_v04_D10_006 |
| Dredge: | D10 |
| Dredge Date: | 13/08/2019 |
| Sample Number Assigned: | Yes |
| Sample photographed (include scale and sample number): | Yes |
| Number of photos: | 2 |
| Sample sawn: | Yes |
| Sticker: | yes |
| Colour: | white | red | brown | yellow |
| Composition: | mafic |
| Phenocryst mineralogy: | olivine[iddingsite] |
| Phenocryst abundance (%): | 20 |
| Phenocryst size range (mm): | 3-25 |
| Groundmass: | microcrystaline | altered |
| Features: | volcanic brecciated |
| Vesicle abundance: | 30-50% |
| Vesicle Filling (%): | 50 |
| Vesicle fill: | calcite |
| Alteration: | Mn crust | altered |
| Grain size: | pebble (2-64 mm) |
| Grain shape: | angular |
| Sorting: | poor |
| Components: | scoria | volcanic vesicular |
| Cement: | calcite |
| Sample bagged: | yes |
| Bucket number: | 20 |
| Rock name: | Poorly sorted altered basalt clast breccia |
| Comments: | Mn-crust 3-25 mm, altered basalt clasts, very small to big clasts, biggest clasts 30 mm, black alteration around basalt clasts and within matrix, Matrix sometimes doesn't react with HCl, these non reactiving parts are milky white, rest of matrix that reacts is lighter white. |