Geochronology of the Saint Kevin Granite and neighboring Precambrian rocks, northern Sawatch Range, Colorado
Pearson, Robert C; Hedge, C E; Thomas, H H; Stern, T W (1966) Geochronology of the Saint Kevin Granite and neighboring Precambrian rocks, northern Sawatch Range, Colorado. Geological Society of America Bulletin, vol.77, no.10, pp.1109-1120, 1966
| Authors | Pearson, Robert C; Hedge, C E; Thomas, H H; Stern, T W |
|---|---|
| Year | 1966 |
| Title | Geochronology of the Saint Kevin Granite and neighboring Precambrian rocks, northern Sawatch Range, Colorado |
| Source | Geological Society of America Bulletin, vol.77, no.10, pp.1109-1120, 1966 |
| ISSN | 0016-7606 |
| GeoRef | 1966-014414 |
| Keywords | absolute age; associated Precambrian rocks; Colorado; dates; granitic composition; igneous; metamorphic rocks; North America; Precambrian; Rocky Mountains; Saint Kevin Granite; Sawatch Range; U. S. Rocky Mountains; United States |
| DOI | 10.1130/0016-7606(1966)77[1109:GOTSKG]2.0.CO;2 |
Abstract
A whole rock Rb-Sr isochron age on the St. Kevin Granite is 1,390+ or -60 m.y. Mineral ages on the St. Kevin and on associated geologically 'Ancient' paragneiss and migmatite are either about the same as this whole rock age or as much as 200 m.y. younger. Mica ages on rocks known to be geologically older than the St. Kevin are low and are interpreted as ages modified by heat from the intruding granite.
1 sample from this reference
| Sample | Rock name | Major | Trace | Isotope |
|---|---|---|---|---|
| C-7 | Granodiorite |