Sample: 88CNU55
| Sample ID: | 88CNU55 [1] |
| Station ID: | 88CNU55 |
| AT Num: | |
| Volcano: | Qtz-Ol-And vent |
| Possible source: | |
| Eruption: | |
| Collector: | Nye, C. J. |
| Date sampled: | 1988-01-01 |
| Sample type 1: | Lava |
| Color: | |
| Final unit: | |
| Text Description: | from the quartz-olivine andesite flows (Qrq) that overlie Qra above Hot Springs cove. The 89 ka age (K-Ar) for this unit is older than expected but geologically feasible. The well-preserved, concentric flow fronts, visible on air photos suggest that the unit is unglaciated, but, field inspection shows that rubbly flow tops have been removed, presumably by glacier ice. The position of this unit on a high, broad ridge uncut by canyons suggests that it was probably overlain by a broad, slow-moving icefield that only slightly eroded the underlying rocks, thus preserving the concentric flow-front morphology. The uppermost Qra section directly below this unit was dated at 285 +/- 9 ka and provides the only available older age constraint for the Qrq unit. |
| Sample Location: |