Single-crystal U-Pb zircon age determination of the Red Mountain pluton, Laramie Anorthosite Complex, Wyoming
Journal Article
·
· American Mineralogist; (USA)
OSTI ID:6033912
- Univ. of Wyoming, Laramie (USA)
- Swiss Federal Institute of Technology, Zurich (Switzerland)
In order to provide a precise age for the Red Mountain pluton, the youngest of the syenitic bodies of the Laramie Anorthosite Complex, Wyoming, zircons were extracted and analyzed for U-Pb isotopes. Zircon grains were selected and individually analyzed in order to minimize potential complications of inherited components. No grains with inherited cores were identified, either by microscopic examination or from the isotopic data. On a concordia diagram, the U-Pb data form a slightly discordant array. A best-fit line intersects concordia at 1,439{sup +7}{sub {minus}6} Ma and 102 {plus minus} 64 Ma (95% confidence level). The upper intercept is interpreted as the crystallization age of the Red Mountain pluton and provides a younger age limit for the rest of the Laramie Anorthosite Complex.
- OSTI ID:
- 6033912
- Journal Information:
- American Mineralogist; (USA), Journal Name: American Mineralogist; (USA) Vol. 75:1-2; ISSN AMMIA; ISSN 0003-004X
- Country of Publication:
- United States
- Language:
- English
Similar Records
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U-Pb zircon and Sm-Nd whole-rock ages of the plutonic rocks of the Crossnore Complex in the southern Appalachian Blue Ridge: Implications for the timing of Late Proterozoic rifting
Neodymium, strontium, and lead isotopes in the Maloin Ranch Pluton, Wyoming: Implications for the origin of evolved rocks at anorthosite margins
Journal Article
·
Tue Sep 01 00:00:00 EDT 1987
· Geochim. Cosmochim. Acta; (United States)
·
OSTI ID:5064689
U-Pb zircon and Sm-Nd whole-rock ages of the plutonic rocks of the Crossnore Complex in the southern Appalachian Blue Ridge: Implications for the timing of Late Proterozoic rifting
Conference
·
Tue Dec 31 23:00:00 EST 1991
· Geological Society of America, Abstracts with Programs; (United States)
·
OSTI ID:5770666
Neodymium, strontium, and lead isotopes in the Maloin Ranch Pluton, Wyoming: Implications for the origin of evolved rocks at anorthosite margins
Journal Article
·
Thu Aug 01 00:00:00 EDT 1991
· Geochimica et Cosmochimica Acta; (United States)
·
OSTI ID:6967762
Related Subjects
58 GEOSCIENCES
580000* -- Geosciences
ACTINIDE ISOTOPES
AGE ESTIMATION
CRYSTALLIZATION
FEDERAL REGION VIII
GEOLOGIC FORMATIONS
IGNEOUS ROCKS
ISOTOPES
LEAD ISOTOPES
MINERALS
MOUNTAINS
NORTH AMERICA
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PLUTONIC ROCKS
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
URANIUM ISOTOPES
USA
WYOMING
ZIRCON
ZIRCONIUM COMPOUNDS
ZIRCONIUM SILICATES
580000* -- Geosciences
ACTINIDE ISOTOPES
AGE ESTIMATION
CRYSTALLIZATION
FEDERAL REGION VIII
GEOLOGIC FORMATIONS
IGNEOUS ROCKS
ISOTOPES
LEAD ISOTOPES
MINERALS
MOUNTAINS
NORTH AMERICA
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PLUTONIC ROCKS
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
URANIUM ISOTOPES
USA
WYOMING
ZIRCON
ZIRCONIUM COMPOUNDS
ZIRCONIUM SILICATES