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Event details
Voyage: | IN2019_V04 [details] |
When: | 2019-08-21 01:09:39 UTC |
Log: | Geology_Rocks_in2019_v04 |
Equipment: | Not specified |
Position: | Latitude: -12.6486 Longitude: 153.6429 Position from underway logging |
Sample number: | in2019_v04_D32_022 |
Dredge: | D32 |
Sample Number Assigned: | Yes |
Sample photographed (include scale and sample number): | Yes |
Number of photos: | 5 |
Sample sawn: | Yes |
Sticker: | yes |
Colour: | black |
Composition: | intermediate |
Phenocryst mineralogy: | feldspar | quartz |
Phenocryst abundance (%): | 15 |
Phenocryst size range (mm): | 1-3 |
Vesicle abundance: | 10-30% |
Vesicle Filling (%): | 1 |
Vesicle fill: | quartz |
Alteration: | Mn crust |
Sample bagged: | yes |
Bucket number: | 45 |
Rock name: | Feldspar quartz phyric dacite |
Comments: | Groundmass crystalline, Mn crust 1-2 mm, coour orange to pink, no reaction with HCl, andesite to dacite, quartz may also be infilling of vesicles. |