Material: | Rock |
Rock Classification: | VOL |
Rock Type: | Crystalline Basalt |
Rock Description (1):
| 238.1-238.63m- Interval:
238.1-238.63m
- Major Lithology:
Crystalline Basalt
- Comments:
NN
- Volcaniclastic Debris:
SEE CRYSTALLINE BASALT; Color:Blackish-gray; Stratification:nn; Granulometric:nn; Secondary Minerals:Y; euhedral secondary minerals on fracture/joint surfaces; Sorting:nn; Support:nn; Grading:nn; Alteration:nn; Fractures:Jointed/fractured, lined (break surfaces), partly filled, and filled (3mm wide) with secondary minerals; Clast Types:nn; Matrix:nn; Comments:nn
- Crystalline Basalt:
Porphyritic; Vesicularity:poorly vesicular; Ves-Textures:spherical, subspherical, and polylobate morphologies; in vesicle bands separated by microvesicular to dense zones. Vesicle bands are parallel to contact and continue away from contact.; Jointing:Highly jointed with euhedral secondary minerals on joint surfaces; Phenocryst:Olivine (=1 mm), rare feldspar; Phen-Abundance:10%; Contacts:Planar contact with 1 mm glass margin and ~70C degrees partly filled fracture (with secondary minerals) separating crystalline basalt and lapilli tuff; Comments:Groundmass is microcrystalline. **The contact inclination is approximate**
|
Rock Description (2):
| 238.63-239.23m- Interval:
238.63-239.23m
- Major Lithology:
Tuff
- Comments:
NN
- Volcaniclastic Debris:
Well lithified; Color:Dark Gray to blackish-gray; Stratification:nn; Granulometric:Fine lapilli tuff; Secondary Minerals:Y; extensively in intergranular space; Sorting:Poor to moderately sorted; Support:Matrix supported; Grading:Massive; Alteration:Highly altered; Fractures:JOINTED parallel to contact with crystalline basalt; Clast Types:lapilli (simple/ zoned), lithics; Matrix:Coarse to medium ash with intergranular secondary minerals; Comments:8 mm thick, passes into Medium lapilli tuff with outsized coarse lapilli (below) away from contact
|
Rock Description (3):
| 238.7-239.66m- Interval:
238.7-239.66m
- Major Lithology:
Tuff
- Comments:
NN
- Volcaniclastic Debris:
Well lithified; Color:Dark Green; Stratification:nn; Granulometric:Medium lapilli tuff with outsized coarse lapilli; Secondary Minerals:Y; within clast vesicles, matrix, and intergranular space.; Sorting:Poorly sorted; Support:Matrix supported; Grading:Massive; Alteration:Highly altered; Fractures:partially infilled fracture along contact; Clast Types:lapilli (simple/ zoned), composites, lithics; Matrix:Coarse to medium ash and rare crystal fragments with intergranular altered fines and secondary minerals; Lithic:1-2; Comments:Exact length of contact difficult to determine due to highly fractured nature of core.
|
From Corrected Depth: | 238.10 |
To Corrected Depth: | 239.06 |
Depth Reference: | meter below ground level |
Geological Age: | quaternary-holocene |
Geological Unit: | N/A |