Cosmogenic-nuclide measurements and stratigraphic info
Borehole 17-A-76
Key to drillhole logs
Be-10 and Al-26 in quartz
| | Depth | | [Be-10] | | | | [Al-26] | | |
Sample name | | (ft) | | (atoms/g) | | +/- | | (atoms/g) | | +/- |
|
17-A-76-130 | | 130 | | 6.28E+04 | | 2.38E+03 | | 2.22E+05 | | 1.51E+04 |
17-A-76-146 | | 146 | | 1.42E+05 | | 4.95E+03 | | 3.93E+05 | | 2.74E+04 |
17-A-76-146F | | 146 | | 1.55E+05 | | 5.39E+03 | | 4.15E+05 | | 2.90E+04 |
Bulk Be-10 in sediment
| | Depth | | [Be-10] | | |
Sample name | | (ft) | | (atoms/g) | | +/- |
|
17-A-76-121 | | 121 | | 7.01E+07 | | 2.28E+06 |
17-A-76-150 | | 150 | | 1.01E+08 | | 3.11E+06 |
Stratigraphy
Mass depths reflect the following density assumptions:
What? | | Till | Glaciolacustrine | Sand | Loess | Silty sand | Gravelly sand |
Density(g cm-3)
| | 2.25 | 2.06 | 2.13 | 2.18 | 2.06 | 2.49 |
These are averages derived from the density measurements here.
Top depth | | Bottom depth | | Lithology | | Top depth | | Bottom depth | | Density | | Mass thickness | | Top mass depth | | Bottom mass depth |
(ft) | | (ft) | | | | (m) | | (m) | | (g cm-3) | | of unit (g cm-2) | | (g cm-2) | | (g cm-2) |
|
0 | | 12.5 | | LOESS | | 0.00 | | 3.81 | | 2.18 | | 832 | | 0 | | 832 |
12.5 | | 28 | | TILL | | 3.81 | | 8.53 | | 2.25 | | 1061 | | 832 | | 1892 |
28 | | 37.5 | | SLTSND | | 8.53 | | 11.43 | | 2.10 | | 608 | | 1892 | | 2501 |
37.5 | | 41 | | TILL | | 11.43 | | 12.50 | | 2.25 | | 240 | | 2501 | | 2740 |
41 | | 87.5 | | TILL | | 12.50 | | 26.67 | | 2.25 | | 3182 | | 2740 | | 5922 |
87.5 | | 121.5 | | TILL | | 26.67 | | 37.03 | | 2.25 | | 2327 | | 5922 | | 8249 |
121.5 | | 137 | | SAND | | 37.03 | | 41.76 | | 2.13 | | 1008 | | 8249 | | 9257 |
137 | | 177 | | TILL | | 41.76 | | 53.95 | | 2.25 | | 2737 | | 9257 | | 11994 |
177 | | 180 | | BR | | 53.95 | | 54.86- | | - | | - | | - | | |