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Event details
| Voyage: | IN2019_V04 [details] |
| When: | 2019-08-25 20:54:32 UTC |
| Log: | Geology_Rocks_in2019_v04 |
| Equipment: | Not specified |
| Position: | Latitude: -13.3521 Longitude: 158.9736 Position from underway logging |
| Sample number: | in2019_v04_D41-008 |
| Dredge: | D41 |
| Sample Number Assigned: | Yes |
| Sample photographed (include scale and sample number): | Yes |
| Number of photos: | 4 |
| Sample sawn: | Yes |
| Sticker: | yes |
| Colour: | black | grey-dark | brown | yellow |
| Composition: | mafic |
| Alteration: | Mn crust | altered |
| Phenocryst mineralogy: | feldspar | pyroxene | other |
| Phenocryst abundance (%): | 100 |
| Phenocryst size range (mm): | 2-7 |
| Groundmass: | crystalline |
| Features: | other |
| Vesicle abundance: | absent |
| Grain size: | sand (<2 mm) | pebble (2-64 mm) |
| Grain shape: | angular |
| Sorting: | poor |
| Components: | volcanic non-vesicular | carbonate/shell | other |
| Sample bagged: | yes |
| Bucket number: | 74 |
| Rock name: | Massive, altered gabbro |
| Comments: | Lots of large (4-7mm) black crystals (probably pyroxene but subhedral crystals - difficult to tell shape) Lots of lath-like yellow/orange crystals (1-2 mm)- presumed plag - now quite altered Lots of while mica also (1-3 mm) - took picture with microscope Small slither of carbonate/clay breccia on sie of gabbro Possibly dolerite with coarser pyroxene phenocrysts |
| Comments: | Lots of large (4-7mm) black crystals (probably pyroxene but subhedral crystals - difficult to tell shape) Lots of lath-like yellow/orange crystals (1-2 mm)- presumed plag - now quite altered Lots of while mica also (1-3 mm) - took picture with microscope Small slither of carbonate/clay breccia on sie of gabbro Possibly dolerite with coarser pyroxene phenocrysts |