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Event details
Voyage: | IN2019_V04 [details] |
When: | 2019-08-19 12:13:11 UTC |
Log: | Geology_Rocks_in2019_v04 |
Equipment: | Not specified |
Position: | Latitude: -14.4481 Longitude: 155.8624 Position from underway logging |
Sample number: | in2019_v04_D29_003 |
Dredge: | D29 |
Sample Number Assigned: | Yes |
Sample photographed (include scale and sample number): | Yes |
Number of photos: | 7 |
Sample sawn: | Yes |
Sticker: | yes |
Colour: | black | white | brown |
Composition: | mafic |
Phenocryst mineralogy: | feldspar |
Phenocryst abundance (%): | 20 |
Phenocryst size range (mm): | 0.5-3 |
Groundmass: | altered |
Vesicle abundance: | 10-30% |
Vesicle Filling (%): | 50 |
Vesicle fill: | calcite |
Alteration: | Mn crust | altered |
Sample bagged: | yes |
Bucket number: | 38 |
Rock name: | Feldspar-phyric vesicular basalt |
Comments: | Large vesicles (1-30mm). Groundmass is rusted red in colour, suggesting Fe-oxide content. Groundmass has red spotted alteration. Feldspar crystals are small, mostly <1mm. Abundant plagioclase laths in groundmass? |