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Event details
| Voyage: | IN2019_V04 [details] |
| When: | 2019-08-11 13:53:36 UTC |
| Log: | Geology_Rocks_in2019_v04 |
| Equipment: | Not specified |
| Position: | Latitude: -20.266 Longitude: 155.6694 Position from underway logging |
| Sample number: | in2019_v04_D07_011 |
| 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): | 0.5-3 |
| Groundmass: | microcrystaline |
| Features: | volcanic brecciated |
| Vesicle abundance: | <10% |
| Vesicle Filling (%): | 70 |
| Vesicle fill: | clay |
| Alteration: | Fresh | Mn crust | altered |
| Grain size: | sand (<2 mm) | 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 |
| Comments: | sedimentary volcanic breccia in limestone/clay matrix, Mn crust 1-10 mm, Basaltic clasts within limestone/clay matrix > unable to tell if clast or matrix supported. small volcaniclastic sand sized grains making up matrix. thick Mn crust adn thick alteration rims ~2cm. Fresh core with olivines and plagioclase phenocrysts. refer to the diagram |