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Event details
Voyage: | IN2019_V04 [details] |
When: | 2019-08-21 11:03:46 UTC |
Log: | Geology_Rocks_in2019_v04 |
Equipment: | Not specified |
Position: | Latitude: -13.3959 Longitude: 154.0507 Position from underway logging |
Sample number: | in2019_v04_D33-006 |
Dredge: | D33 |
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 | red |
Composition: | mafic |
Alteration: | Mn crust | altered |
Phenocryst mineralogy: | other |
Groundmass: | altered |
Features: | volcanic brecciated |
Vesicle abundance: | absent |
Grain size: | cobble (>64 mm) |
Grain shape: | mixture |
Sorting: | poor |
Components: | volcanic non-vesicular |
Cement: | calcite | other |
Sample bagged: | yes |
Bucket number: | 49 |
Rock name: | Poorly sorted volcanic breccia with a rounded pebble |
Comments: | Mn crust 20 mm thick. Clasts have veins and cracks - alteration of rocks is red - some veins are filled with white mineral which does not react with HCl acid and is softer than knife (zeolite) - may show jigsaw fitting of clasts partially - one clast (4cm long) is rounded suggesting transportation of the clast |