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Event details
| Voyage: | IN2019_V04 [details] |
| When: | 2019-08-22 06:55:54 UTC |
| Log: | Geology_Rocks_in2019_v04 |
| Equipment: | Not specified |
| Position: | Latitude: -11.9797 Longitude: 156.2636 Position from underway logging |
| Sample number: | in2019_v04_D34_004 |
| Dredge: | D34 |
| Sample Number Assigned: | Yes |
| Sample photographed (include scale and sample number): | Yes |
| Number of photos: | 4 |
| Sample sawn: | Yes |
| Sticker: | yes |
| Colour: | black | grey-light | white | brown |
| Composition: | sedimentary |
| Alteration: | Mn crust | altered |
| Phenocryst mineralogy: | feldspar | olivine[iddingsite] |
| Phenocryst abundance (%): | 20 |
| Phenocryst size range (mm): | 0.5-3 |
| Groundmass: | microcrystaline | altered |
| Features: | volcanic brecciated |
| Vesicle abundance: | 10-30% |
| Vesicle Filling (%): | 10 |
| Vesicle fill: | calcite |
| Grain size: | sand (<2 mm) | pebble (2-64 mm) |
| Grain shape: | angular |
| Sorting: | moderate |
| Components: | scoria | volcanic vesicular |
| Cement: | calcite | other carbonate |
| Sample bagged: | yes |
| Bucket number: | 53 |
| Rock name: | Iddingsite phyric, vesicular volcanic breccia |
| Comments: | Possible plagioclase laths in groundmass of large basalt clast - other smaller clasts are very red and vesicular and probably scoracious - unsure of cement which is white and cloudy and difficult to scratch - does not react with acid voluntarily but does when scratched into finer grain - possible dolomite? more likely just calcite |