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Event details
| Voyage: | IN2019_V04 [details] |
| When: | 2019-08-21 14:03:19 UTC |
| Log: | Geology_Rocks_in2019_v04 |
| Equipment: | Not specified |
| Position: | Latitude: -13.2558 Longitude: 154.5776 Position from underway logging |
| Sample number: | in2019_v04_D33-034 |
| Dredge: | D33 |
| Sample Number Assigned: | Yes |
| Sample photographed (include scale and sample number): | Yes |
| Number of photos: | 5 |
| Sample sawn: | Yes |
| Sticker: | yes |
| Colour: | black | grey-light | red | brown | yellow |
| Composition: | mafic |
| Alteration: | Mn crust | altered |
| Groundmass: | microcrystaline | altered |
| Features: | volcanic brecciated |
| Vesicle abundance: | absent |
| Grain size: | sand (<2 mm) | pebble (2-64 mm) |
| Grain shape: | angular |
| Sorting: | moderate |
| Components: | volcanic non-vesicular | other |
| Cement: | other |
| Sample bagged: | yes |
| Bucket number: | 54 |
| Rock name: | Highly altered, veined, igneous? breccia in clay matrix |
| Comments: | Mn crust 75 mm thick. Sometimes clast supported othertimes matrix supported - highly altered clasts of microcrystalline material - dark grey in colour and angular suggests volcanic - matrix is full of yellow/brown clay and contains white mica - all surrounded by a thick Mn crust - Mn layers also run throughout the matrix - nice example of all environments from dredge 33 in one rock |