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Event details
| Voyage: | IN2019_V04 [details] |
| When: | 2019-08-11 13:19:16 UTC |
| Log: | Geology_Rocks_in2019_v04 |
| Equipment: | Not specified |
| Position: | Latitude: -20.3131 Longitude: 155.7777 Position from underway logging |
| Sample number: | in2019_v04_D07_005 |
| Dredge: | D07 |
| Dredge Date: | 11/08/19 |
| Sample Number Assigned: | Yes |
| Sample photographed (include scale and sample number): | Yes |
| Number of photos: | 4 |
| Sample sawn: | Yes |
| Sticker: | yes |
| Colour: | grey-light | red | brown | yellow |
| Composition: | mafic |
| Phenocryst mineralogy: | feldspar | olivine[iddingsite] |
| Phenocryst abundance (%): | 40 |
| Phenocryst size range (mm): | 0.5-6 |
| Groundmass: | microcrystaline |
| Features: | volcanic brecciated |
| Vesicle abundance: | 10-30% |
| Vesicle Filling (%): | 20 |
| Vesicle fill: | calcite, clay |
| Alteration: | Fresh | Mn crust | altered |
| Grain size: | pebble (2-64 mm) | cobble (>64 mm) |
| Grain shape: | angular |
| Sorting: | poor |
| Components: | volcanic vesicular |
| Cement: | calcite |
| Sample bagged: | yes |
| Bucket number: | 14 |
| Rock name: | Mafic Volcanic Breccia |
| Requested: | UK | Monash |
| Comments: | limestone matrix volcanic breccia, Mn crust 0.5-2 mm, volcanic breccia containing basaltic clasts in a limestone matrix. sample made up of one large clast, quite fractured with more vesicles along veins. alteration along clast rims and along veins. fresh plagioclase with iddingsite phenocrysts (fresh core). refer to the diagram |