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Potassium-argon ages bearing on the igneous and tectonic history of the Elk mountains and vicinity, Colorado; a preliminary report

Obradovich, John D; Mutschler, Felix E; Bryant, Bruce Potassium-argon ages bearing on the igneous and tectonic history of the Elk mountains and vicinity, Colorado; a preliminary report. Geological Society of America Bulletin, vol.80, no.9, pp.1749-1756, 1969

AuthorsObradovich, John D; Mutschler, Felix E; Bryant, Bruce
TitlePotassium-argon ages bearing on the igneous and tectonic history of the Elk mountains and vicinity, Colorado; a preliminary report
SourceGeological Society of America Bulletin, vol.80, no.9, pp.1749-1756, 1969
ISSN0016-7606
GeoRef1969-024581
Keywordsabsolute age; age; Cenozoic; Colorado; Cretaceous; dates; Elk Mountains; igneous rocks; K/Ar; K/Ar data; Mesozoic; tectonics; Tertiary; United States; upper

Abstract

Absolute ages ranging from 72.2

12 samples from this reference

SampleRock nameMajorTraceIsotope
HNMPMonzonite yes
1045Aplite yes
1045Aplite yes
TLMonzonite yes
386Granodiorite yes
WR-2Granodiorite yes
NY-5Granodiorite yes
389Granodiorite yes
472Granodiorite yes
390Granodiorite yes
348Granite yes
391Granite yes