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Event details
Voyage: | IN2019_V04 [details] |
When: | 2019-08-26 11:43:55 UTC |
Log: | Geology_Rocks_in2019_v04 |
Equipment: | Not specified |
Position: | Latitude: -14.1911 Longitude: 159.6826 Position from underway logging |
Sample number: | in2019_v04_D43-005 |
Dredge: | D43 |
Sample Number Assigned: | Yes |
Sample photographed (include scale and sample number): | Yes |
Number of photos: | 3 |
Sample sawn: | Yes |
Sticker: | yes |
Colour: | black | grey-light | brown |
Composition: | mafic |
Alteration: | Mn crust |
Phenocryst mineralogy: | feldspar |
Phenocryst abundance (%): | 20% |
Phenocryst size range (mm): | 0.5-3mm |
Groundmass: | microcrystaline |
Vesicle abundance: | 10-30% |
Vesicle Filling (%): | 30% |
Vesicle fill: | calcite |
Sample bagged: | yes |
Bucket number: | 80 |
Rock name: | Altered feldspar-phyric basalt |
Comments: | Mn crust thickness 25mm. Veins and calcite patches. Potential fresh feldspar. Bornw alteration at the rim of the rock near MnOx crust. Maybe px present? |