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Event details
| Voyage: | IN2019_V04 [details] |
| When: | 2019-08-21 13:16:39 UTC |
| Log: | Geology_Rocks_in2019_v04 |
| Equipment: | Not specified |
| Position: | Latitude: -13.2925 Longitude: 154.4398 Position from underway logging |
| Sample number: | in2019_v04_D33-021 |
| Dredge: | D33 |
| Sample Number Assigned: | Yes |
| Sample photographed (include scale and sample number): | Yes |
| Number of photos: | 3 |
| Sample sawn: | Yes |
| Sticker: | yes |
| Colour: | black | grey-dark | grey-light | brown |
| Composition: | mafic |
| Alteration: | Mn crust | altered |
| Groundmass: | microcrystaline | altered |
| Features: | volcanic brecciated |
| Vesicle abundance: | absent |
| Grain size: | cobble (>64 mm) |
| Grain shape: | angular |
| Sorting: | good |
| Components: | volcanic non-vesicular |
| Cement: | other |
| Sample bagged: | yes |
| Bucket number: | 49 |
| Rock name: | Highly altered, veined, igneous? clast |
| Comments: | Mn crust 20 mm. very fine grained grey rock surrounded by Mn - clast looks to be a mafic volcanic but highly altered with lots of veining full of zeolite and clay - lots of fracturing - no clear phenocrysts - high level of blotchy alteration |