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Event details
| Voyage: | IN2019_V04 [details] |
| When: | 2019-08-11 14:09:14 UTC |
| Log: | Geology_Rocks_in2019_v04 |
| Equipment: | Not specified |
| Position: | Latitude: -20.2445 Longitude: 155.6202 Position from underway logging |
| Sample number: | in2019_v04_D07_009 |
| 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 (%): | 40 |
| Phenocryst size range (mm): | 0.5-5 |
| Groundmass: | microcrystaline |
| Features: | volcanic brecciated |
| Vesicle abundance: | 10-30% |
| Vesicle Filling (%): | 50 |
| 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: | 15 |
| Rock name: | Mafic Volcanic Breccia and possible pillow? |
| Comments: | Mn crust 1-2 mm, large basaltic clast within volcanic breccia > calcite/clay matrix > unable to tell if clast or matrix supported > thick alteration along veins. abundant iddingsite and plagioclase phenocrysts > possibly a pillow lava due to shape?. refer to the diagram |