New U/Pb Ages from Granite and Granite Gneiss in the Ruby Geanticline and Southern Brooks Range, Alaska
Journal of Geology
By: W. W. Patton Jr., T. W. Stern, Joseph G. Arth, and C. Carlson
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Abstract
New U/Pb zircon ages from the Ray Mountains of central Alaska clarify the plutonic history of the Ruby geanticline and support earlier suggestions that the Ruby geanticline and S Brooks Range were once parts of the same tectonostratigraphic terrane. U/Pb zircon ages of 109 to 112 Ma from the Ray Mountains pluton confirm previously reported mid-Cretaceous K/Ar ages and rule out the possibility that the earliest intrusive phase of the pluton is older than mid-Cretaceous K/Ar ages and rule out the possibility that the earliest intrusive phase of the pluton is older than mid- Cretaceous. New U/Pb zircon ages from 4 granite gneiss samples in the Ray Mountains indicate a Devonian protolith age of 390+ or -12 Ma and suggest that the Ruby geanticline, like the S Brooks Range, underwent a major plutonic event in mid-Paleozoic time.-Authors
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | New U/Pb Ages from Granite and Granite Gneiss in the Ruby Geanticline and Southern Brooks Range, Alaska |
| Series title | Journal of Geology |
| Volume | 95 |
| Issue | 1 |
| Year Published | 1987 |
| Language | English |
| Publisher | University of Chicago Press |
| Description | 9 p. |
| First page | 118 |
| Last page | 126 |
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