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Event details
Voyage: | IN2019_V04 [details] |
When: | 2019-08-11 14:09:14 UTC |
Log: | Geology_Rocks_in2019_v04 |
Equipment: | Not specified |
Position: | Latitude: -20.2445 Longitude: 155.6202 Position from underway logging |
Sample number: | in2019_v04_D07_009 |
Dredge: | D07 |
Sample Number Assigned: | Yes |
Sample photographed (include scale and sample number): | Yes |
Number of photos: | 2 |
Sample sawn: | Yes |
Sticker: | yes |
Colour: | grey-light | red | brown | yellow |
Composition: | mafic |
Phenocryst mineralogy: | feldspar | olivine[iddingsite] |
Phenocryst abundance (%): | 40 |
Phenocryst size range (mm): | 0.5-5 |
Groundmass: | microcrystaline |
Features: | volcanic brecciated |
Vesicle abundance: | 10-30% |
Vesicle Filling (%): | 50 |
Vesicle fill: | calcite, clay |
Alteration: | Fresh | Mn crust | altered |
Grain size: | pebble (2-64 mm) | cobble (>64 mm) |
Grain shape: | angular |
Sorting: | poor |
Components: | volcanic vesicular |
Cement: | calcite |
Sample bagged: | yes |
Bucket number: | 15 |
Rock name: | Mafic Volcanic Breccia and possible pillow? |
Comments: | Mn crust 1-2 mm, large basaltic clast within volcanic breccia > calcite/clay matrix > unable to tell if clast or matrix supported > thick alteration along veins. abundant iddingsite and plagioclase phenocrysts > possibly a pillow lava due to shape?. refer to the diagram |