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Event details
| Voyage: | IN2019_V04 [details] |
| When: | 2019-08-11 12:32:04 UTC |
| Log: | Geology_Rocks_in2019_v04 |
| Equipment: | Not specified |
| Position: | Latitude: -20.3705 Longitude: 155.91 Position from underway logging |
| Sample number: | in2019_v04_D07_002 |
| Dredge: | D07 |
| Sample Number Assigned: | Yes |
| Sample photographed (include scale and sample number): | Yes |
| Number of photos: | 2 |
| Sample sawn: | Yes |
| Sticker: | yes |
| Colour: | grey-light | red | brown | yellow |
| Composition: | mafic |
| Phenocryst mineralogy: | feldspar | olivine[iddingsite] |
| Phenocryst abundance (%): | 10 |
| Phenocryst size range (mm): | 1-6 |
| Groundmass: | microcrystaline |
| Features: | volcanic brecciated |
| Vesicle abundance: | <10% |
| Vesicle Filling (%): | 50 |
| Vesicle fill: | Clay, calcite veins |
| 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: | Breccia, Mn crust (thickness 0.5mm), volcanic breccia with limestone cement, clast supported some alteration on rims of larger clasts. smaller clasts quite altered to rust. fresh plagioclase and groundmass!, refer to the diagram |