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Event details
| Voyage: | IN2019_V04 [details] |
| When: | 2019-08-23 21:46:46 UTC |
| Log: | Geology_Rocks_in2019_v04 |
| Equipment: | Not specified |
| Position: | Latitude: -10.2238 Longitude: 157.2987 Position from underway logging |
| Sample number: | in2019_v04_D36-030 |
| Dredge: | D36 |
| Sample Number Assigned: | Yes |
| Sample photographed (include scale and sample number): | yes |
| Number of photos: | 3 |
| Sample sawn: | Yes |
| Sticker: | yes |
| Colour: | black | grey-dark | grey-light | red | brown | green |
| Composition: | mafic |
| Alteration: | Mn crust | altered |
| Phenocryst mineralogy: | feldspar | olivine[iddingsite] |
| Phenocryst abundance (%): | 20 |
| Phenocryst size range (mm): | 1 |
| Groundmass: | microcrystaline | altered |
| Vesicle abundance: | <10% |
| Vesicle Filling (%): | 0 |
| Grain size: | sand (<2 mm) | pebble (2-64 mm) |
| Grain shape: | angular |
| Sorting: | poor |
| Components: | volcanic non-vesicular |
| Sample bagged: | yes |
| Bucket number: | 61 |
| Rock name: | Altered poorly sorted porphyritic basalt breccia |
| Comments: | Iron oxide alteration. Pebbles in sand sized matrix. Cement might be quartz? looks like clay. some altered olivine but other altered minerals as well which could be pyroxene. |