New U/Pb ages from granite and granite gneiss in the Ruby geanticline and southern Brooks Range, Alaska
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 southern 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. New U/Pb zircon ages from four granite gneiss samples in the Ray Mountains indicate a Devonian protolith age of 390 +/- 12 Ma and suggest that the Ruby geanticline, like the southern Brooks Range, underwent a major plutonic event in mid-Paleozolic time. 23 references.
- Research Organization:
- Geological Survey, Menlo Park, CA
- OSTI ID:
- 5648893
- Journal Information:
- J. Geol.; (United States), Journal Name: J. Geol.; (United States) Vol. 95:1; ISSN JGEOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
580100* -- Geology & Hydrology-- (-1989)
ACTINIDE ISOTOPES
AGE ESTIMATION
ALASKA
ALKALI METAL ISOTOPES
ARGON ISOTOPES
COMPARATIVE EVALUATIONS
CRETACEOUS PERIOD
FEDERAL REGION X
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GRANITES
IGNEOUS ROCKS
ISOTOPE DATING
ISOTOPES
LEAD ISOTOPES
MESOZOIC ERA
MINERALS
NORTH AMERICA
OXYGEN COMPOUNDS
PALEOZOIC ERA
PLUTONIC ROCKS
POTASSIUM ISOTOPES
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
URANIUM ISOTOPES
USA
ZIRCON
ZIRCONIUM COMPOUNDS
ZIRCONIUM SILICATES
580100* -- Geology & Hydrology-- (-1989)
ACTINIDE ISOTOPES
AGE ESTIMATION
ALASKA
ALKALI METAL ISOTOPES
ARGON ISOTOPES
COMPARATIVE EVALUATIONS
CRETACEOUS PERIOD
FEDERAL REGION X
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GRANITES
IGNEOUS ROCKS
ISOTOPE DATING
ISOTOPES
LEAD ISOTOPES
MESOZOIC ERA
MINERALS
NORTH AMERICA
OXYGEN COMPOUNDS
PALEOZOIC ERA
PLUTONIC ROCKS
POTASSIUM ISOTOPES
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
URANIUM ISOTOPES
USA
ZIRCON
ZIRCONIUM COMPOUNDS
ZIRCONIUM SILICATES