Sample: 09KCNYE007
| Sample ID: | 09KCNYE007 [1] |
| Station ID: | 09KCNYE007 |
| AT Num: | |
| Volcano: | Kasatochi |
| Possible source: | |
| Eruption: | |
| Collector: | Nye, C. J. |
| Date sampled: | 2009-01-01 |
| Sample type 1: | |
| Color: | |
| Final unit: | |
| Text Description: | Hand sample; >20g. At north end of massive pink-weathering lava in north end of a large section of bedded rx (PFs, lahars, etc.) on SW part of island. Px-bearing hb dacite. Hb up to 1.5 cm, mostly ~0.5 cm, prismatic. These massive lavas overlie more bedded coarse material which make up lower half of w-facing cliffs and slopes on cone. Massive lavas (perhaps 2 separate bodies) and therefore maybe domes or vent filling lavas. Pics from land and sea of this unit. [Auklets, constant chatter heard from groups immediately offshore. When standing at "the rock" heard lots of chatter seeming to come from base of these cliffs. Groups of ~1-200 come in and sit on 08 deposits - thick mud/surge on top) for a minute or two, then leave. As I leave this place will look back and see many hundred to few thousand standing here. Jeff Williams will tell me that talus buried here used to be home for nocturnal auklets, not these least and whiskered.] Arroyo adjacent to 007 in valley to N is ~8-12 m deep w/ near vertical walls. Edge-parallel cracks - tension cracks - suggest active process of sloughing into gully. Top 10-50 cm (variable) is ubiquitous mud which forms mudcracks at surface and columns in x-sctn. Below is/are lithic pfs w/ up to 1 cm grains and abt lithics. Scoria mostly light. Below this much coarser w/ angular boulders up to 2 m (photo) suspended in fine matrix. Mottled light pinkish-gray and gray amphibole (amph) plag lava. Amphibole is typically euhedral prisms ~1mm across and 5-10mm long - occasional larger xls. Amph reaction rim obvious on sawn surface w/ hand lens. Plag ~1-2mm. Amph >= plag >> px; total phenocrysts ~30%. Gms has alternating zones that are reddish and gray on scale of several mm. Cleaner sample not available at outcrop. |
| Sample Location: |