Table T24. MST and AA data used to calibrate NGR.
| MST-NGR data (cps) | AA K2O data | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Core,
section, interval (cm) |
20 s-A (half) | 20 s-B (half) | 20 s-C (half) | 60 s-A (half) | 60
s-B (half) |
20 s (whole) | NGR average | Control sample | K2O (wt%) |
K2O (interpolation) | Mixing proportion | |
| 185-801C-14R-3: | 185-801C- | |||||||||||
| 10 | 15.3 | 13.5 | 15.6 | 13.9 | 14.7 | 4.1 | GrChert:14R-3-6 | 2.883 | 0.620 | 50 basalt-15 Grchert-35 zero | ||
| 20 | 13.5 | 11.7 | 14.9 | 14.1 | 15.3 | 4.5 | 0.375 | 100 basalt | ||||
| 30 | 13.2 | 15.4 | 14.2 | 14.3 | 14.0 | 3.0 | 0.375 | 100 basalt | ||||
| 40 | 14.6 | 14.8 | 15.6 | 14.3 | 14.5 | 3.2 | 0.375 | 100 basalt | ||||
| 50 | 13.8 | 14.8 | 13.8 | 14.9 | 15.3 | 3.6 | 0.375 | 100 basalt | ||||
| 60 | 15.2 | 13.7 | 14.4 | 15.2 | 14.0 | 3.3 | Basalt: 14R-3-58 | 0.375 | 0.375 | 100 basalt | ||
| 70 | 15.0 | 15.4 | 13.6 | 14.7 | 15.8 | 6.1 | IP1: 14R-3-71 | 2.513 | 0.910 | 75 basalt-25 IP1 | ||
| 80 | 17.6 | 16.9 | 17.7 | 16.3 | 17.5 | 8.8 | 0.589 | 90 basalt-10 IP1 | ||||
| 90 | 18.0 | 19.3 | 18.2 | 18.1 | 19.0 | 12.3 | IP2: 14R-3-96 | 2.579 | 1.477 | 50 basalt-50 IP2 | ||
| 100 | 19.0 | 19.0 | 18.9 | 18.9 | 18.9 | 11.0 | 1.917 | 30 basalt-70 IP2 | ||||
| 110 | 18.2 | 17.9 | 17.9 | 17.6 | 17.3 | 8.7 | 1.392 | 25 basalt-50 IP3-25 IP2 | ||||
| 120 | 19.9 | 16.1 | 17.8 | 17.4 | 17.7 | 12.7 | IP3: 14R-3-120 | 1.307 | 1.027 | 30 basalt-70 IP3 | ||
| 130 | 16.4 | 16.4 | 15.2 | 15.4 | 15.0 | 5.8 | 0.608 | 75 basalt-25 IP3 | ||||
| Average: | 16.1 | 15.7 | 16.0 | 15.8 | 16.1 | 6.7 | ||||||
| K2O: | 0.93 | 0.81 | 0.88 | 0.82 | 0.91 | 0.85 |
0.87
|
0.801 | ||||
| Difference from AA: | 16% | 1% | 10% |
2%
|
14%
|
7%
|
8%
|
|||||
| RSD (%): |
6%
|
|||||||||||
| 20 s readings only, % RSD: |
7%
|
|||||||||||
| Other core data for calibration: | ||||||||||||
| 185-801C-14R-1: | Average |
1.80
|
185-801C-14R-1-75 | 0.074 |
(AA)
|
Basalt for whole section | ||||||
| SD |
0.49
|
|
||||||||||
| 185-801C-14R-4: | Average |
1.95
|
185-801C-14R-4-65 | 0.167 |
(AA)
|
Basalt for whole section | ||||||
| SD |
1.16
|
|
||||||||||
| 185-801C-25R: | Average |
3.88
|
185-801C-25R-1-141 | 0.080 |
(XRF)
|
Basalt for whole core | ||||||
| SD |
0.80
|
|
||||||||||
Notes: MST = multisensor track, AA = atomic absorption, NGR = natural gamma radiation, GrChert = green chert, IP = interpillow, RSD = relative standard deviation, SD = standard deviation, XRF = X-ray fluorescence. NGR data for half- and whole-round cores, readings taken every 10 cm for 20 or 60 s. NGR K2O calculated from calibration shown in Figure F93B. K2O interpolated from control samples using mixing proportions given.