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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 |