Radiometric dating of intrusive rocks in the Cottonwood area, Utah

Journal of Research of the U.S. Geological Survey
By: , and 

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Abstract

Recently completed fission-track and K-Ar dating of zircon, sphene, apatite, muscovite, biotite, and hornblende indicate that the Clayton Peak stock was intruded 37-41 m.y. ago, the Alta stock about 32-33 m.y. ago, and the Little Cottonwood stock between 24 and 31 m.y. ago. Pb-a ages on zircon, though showing the same sequence, are about twice as great and are inferred to represent a partial
mixing of inherited Precambrian zircons. Acceptance of a middle Tertiary age for the Little Cottonwood stock requires revision of earlier
interpretations that it could be as old as Late Cretaceous. K-Ar dates also indicate that the Keetley Volcanics are 32 to 35 m.y. old, and a
single date of 37.3 m.y. was obtained on the Traverse Volcanics, suggesting that they are more closely related to volcanic activity in the
adjoining Oquirrh Mountains.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Radiometric dating of intrusive rocks in the Cottonwood area, Utah
Series title Journal of Research of the U.S. Geological Survey
Volume 1
Issue 2
Year Published 1973
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Description 6 p.
First page 173
Last page 178
Country United States of America
State Utah
Other Geospatial Litte Cottonwood Stock
Online Only (Y/N) N
Additional Online Files (Y/N) N
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