Outcrop or artificial surface exposure, Diabase
| Geographic location |
-110.055833, 45.442222
110°
3'
21"
W,
45°
26'
32"
N
Sweet Grass county,
MT
Mount Douglas
1:62,500 scale map quadrangle
Accurate to within 1 minute (~1 mile)
NORTHERN BEARTOOTH MOUNTAINS
|
|---|---|
| Source of sample | Outcrop or artificial surface exposure |
| Rock name | Diabase |
| Description | SAMPLE TAKEN FROM CHILLED MARGIN OF DIABASE DIKE; PARTIAL RECRYSTALLIZATION OF PYROXENE TO AMPHIBOLE |
| Laboratories | University of North Carolina |
| Compiler name | Marvin, R.F. |
| Date compiled | 1980 03 |
| Precision of location | Accurate to within 1 minute (~1 mile) |
| Location comment | NORTHERN BEARTOOTH MOUNTAINS |
| Bibliographic reference | Wooden, J.L., 1975, Geochemistry and Rb-Sr Geochronology Of Precambrian Mafic Dikes From The Beartooth, Ruby Range, and Tobacco Root Mountains, Montana: Ph.D. Dissertation, Univ. Of North Carolina, Chapel Hill, N.C., 229p. |
| (click for info) | |
| Geologic map unit | -110.055833, 45.442222 |
| Nearby scientific data | Find additional scientific data near this location |
| Age estimate | 2231.89 ± 100Ma |
|---|---|
| Type of analysis | 87Sr/86Sr-87Rb/86Sr isochron (whole rock) 3-POINT WHOLE-ROCK ISOCHRON (ANALYTICAL DATA FROM BAADSGAARD AND MUELLER, 1973)
|
| Rock or mineral analyzed | whole rock |
| Analytical details | |
| Lab sample ID | MBT-6 |
| Sample suite # | 318 |
| Decay constants | 0.0000139* |
| Rubidium concentration | 72.9 ppm |
| Strontium concentration | 138 ppm |
| Initial 87Sr/86Sr | 0.707 |
| Ratio 87Rb/86Sr | 1.531 |
| Ratio 87Sr/86Sr | 0.7563 |
| Normal? | N |