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Event details
Voyage: | IN2019_V04 [details] |
When: | 2019-08-31 11:55:25 UTC |
Log: | Geology_Rocks_in2019_v04 |
Equipment: | Not specified |
Position: | Latitude: -22.9341 Longitude: 159.7898 Position from underway logging |
Sample number: | in2019_v04_D53-005 |
Dredge: | D53 |
Sample Number Assigned: | Yes |
Sample photographed (include scale and sample number): | Yes |
Number of photos: | 3 |
Sample sawn: | Yes |
Sticker: | yes |
Colour: | black | red | brown |
Composition: | mafic |
Alteration: | Mn crust | altered |
Phenocryst mineralogy: | feldspar | olivine[iddingsite] |
Phenocryst abundance (%): | 40 |
Phenocryst size range (mm): | 0.5-5 |
Groundmass: | microcrystaline | altered |
Features: | other |
Vesicle abundance: | 10-30% |
Vesicle Filling (%): | <10% |
Vesicle fill: | Clay |
Sample bagged: | yes |
Bucket number: | 91 |
Rock name: | Altered iddingsite-phyric basalt |
Comments: | Mssive. Mn Crust Thickness 10mm. Maybe plag laths in groundmass. Veining pervasive (<0.5mm wide) filled with Mn and clay. Huge iddingsites altered to clay. |