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Event details
Voyage: | IN2019_V04 [details] |
When: | 2019-08-10 15:02:46 UTC |
Log: | Geology_Rocks_in2019_v04 |
Equipment: | Not specified |
Position: |
Latitude: -20.88472 Longitude: 154.61111
- entered into Elog as -20.884722, 154.611111 |
Grain shape: | angular |
Sorting: | poor |
Components: | volcanic vesicular |
Cement: | calcite |
Sample bagged: | yes |
Bucket number: | 10 |
Rock name: | Mafic Vulcanic Breccia with pillow fragments |
Requested: | UK | Monash |
Comments: | Mn crust <1 mm, rock is very hard when cut. Some fragments have quenched rim indicating that there maybe fragments of pillow lava. Contains fresh plagioclase. Some olivine may be fresh. Check thin section. |
Sample number: | in2019_v04_D04_014 |
Dredge: | D04 |
Sample Number Assigned: | Yes |
Sample photographed (include scale and sample number): | Yes |
Number of photos: | 4 |
Sample sawn: | Yes |
Sticker: | yes |
Colour: | grey-dark |
Composition: | mafic |
Phenocryst mineralogy: | feldspar | olivine[iddingsite] |
Phenocryst abundance (%): | 10% |
Phenocryst size range (mm): | 0.5-2 |
Groundmass: | microcrystaline |
Features: | pillow lava | volcanic brecciated |
Vesicle abundance: | <10% |
Vesicle Filling (%): | 50 |
Vesicle fill: | calcite |
Alteration: | Fresh | Mn crust |
Grain size: | pebble (2-64 mm) | cobble (>64 mm) |