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Event details
| Voyage: | IN2019_V04 [details] |
| When: | 2019-08-13 13:19:17 UTC |
| Log: | Geology_Rocks_in2019_v04 |
| Equipment: | Not specified |
| Position: | Latitude: -19.1882 Longitude: 155.4706 Position from underway logging |
| Sample number: | in2019_v04_D12_005 |
| Dredge: | D12 |
| Sample Number Assigned: | Yes |
| Sample photographed (include scale and sample number): | Yes |
| Number of photos: | 5 |
| Sample sawn: | Yes |
| Sticker: | yes |
| Colour: | black | red |
| Composition: | mafic |
| Alteration: | Mn crust | altered |
| Phenocryst mineralogy: | olivine[iddingsite] |
| Phenocryst abundance (%): | 10 |
| Phenocryst size range (mm): | 0.5-1.5 |
| Groundmass: | microcrystaline | altered |
| Features: | volcanic brecciated |
| Vesicle abundance: | <10% |
| Vesicle Filling (%): | 30 |
| Vesicle fill: | calcite and zeolite |
| Grain size: | sand (<2 mm) | pebble (2-64 mm) |
| Grain shape: | mixture |
| Sorting: | poor |
| Sample bagged: | yes |
| Bucket number: | 25 |
| Rock name: | Matrix supported poorly bedded multilithic pebble breccia |
| Comments: | 85mm Mn thickness. Thick Mn oxide crust. Biological structures are present. Clasts are relatively rounded and this may suggest some transportation of clast. Diagram on back. |