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Event details
Voyage: | IN2018_V08 [details] |
When: | 2018-12-29 05:07:59 UTC |
Log: | Geology_Rocks_in2018_v08 |
Equipment: | Not specified |
Position: | Latitude: -39.9922 Longitude: 157.1653 Position from underway logging |
Sample number: | IN2018_V08_D01_013 |
Dredge: | 01 |
Dredge Date: | 28/12/2018 |
Sample Number Assigned: | Yes |
Sample photographed (include scale and sample number): | Yes |
Sample sawn: | Yes |
Sawn sample photographed: | Yes |
Number of photos: | 8 |
Colour: | black | grey-dark | red | brown |
Composition: | mafic |
Alteration: | Fresh | Mn crust | altered |
Grain size: | pebble (2-64 mm) |
Grain shape: | rounded |
Sorting: | moderate |
Components: | scoria | volcanic non-vesicular |
Phenocryst mineralogy: | feldspar | altered |
Phenocryst abundance (%): | 5 |
Phenocryst size range (mm): | 1 |
Groundmass: | microcrystaline | altered |
Vesicle abundance: | low (<30%) |
Sample bagged: | yes |
Sticker: | yes |
Bucket number: | 003 |
Rock name: | polymictic volcanic conglomerate enclosed in a volcanic breccia |
Comments: | two stages of evolution, with a volcanic conglomerate included within a later stage volcanics |