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Event details
| Voyage: | IN2019_V04 [details] |
| When: | 2019-08-11 14:26:16 UTC |
| Log: | Geology_Rocks_in2019_v04 |
| Equipment: | Not specified |
| Position: | Latitude: -20.2218 Longitude: 155.568 Position from underway logging |
| Sample number: | in2019_v04_D07_016 |
| Dredge: | D07 |
| Sample Number Assigned: | Yes |
| Sample photographed (include scale and sample number): | Yes |
| Number of photos: | 7 |
| Sample sawn: | Yes |
| Sticker: | yes |
| Colour: | black | grey-light | red | brown | yellow |
| Composition: | mafic |
| Phenocryst mineralogy: | feldspar | olivine[iddingsite] |
| Phenocryst abundance (%): | 20 |
| Phenocryst size range (mm): | 1-3 |
| Groundmass: | microcrystaline |
| Features: | volcanic brecciated |
| Vesicle abundance: | <10% |
| Vesicle Filling (%): | 50 |
| Vesicle fill: | clay |
| Alteration: | Fresh | Mn crust | altered |
| Grain size: | sand (<2 mm) | pebble (2-64 mm) |
| Grain shape: | angular |
| Sorting: | poor |
| Components: | volcanic vesicular | carbonate/shell |
| Cement: | calcite |
| Sample bagged: | yes |
| Bucket number: | 16/17 |
| Rock name: | Limestone matrix supported volcanic breccia |
| Comments: | Sample cut into 3 pieces as very large! Basaltic clasts in matrix supported breccia. Relatively fresh core but mostly altered. Full of plagioclase laths. Some iddingsite and plagioclase phenocrysts. Limestone matrix full of shelly fragments and volcanoclastic grains. Thick manganese crust in places fresh plagioclase. |