Petrogenetic and tectonic significance of xenocrystic Precambrian zircon in Lower Cambrian tonalite, eastern Klamath Mountains, California
Journal Article
·
· Geology; (USA)
- Univ. of Nevada, Las Vegas (USA)
U-Pb analyses of zircon from a Lower Cambrian tonalite in the Yreka terrane, Klamath Mountains, California, reveal an inherited Precambrian zircon component within rocks that have generally been believed to be part of the ophiolitic Trinity complex. The isotopic data indicate that Lower Cambrian plutonic rocks in the eastern Klamath Mountains are probably not ophiolitic in origin. These Lower Cambrian rocks may be either tectonic blocks within a lower Paleozoic accretionary complex or part of a disrupted Lower Cambrian volcanoplutonic terrane.
- OSTI ID:
- 5796849
- Journal Information:
- Geology; (USA), Journal Name: Geology; (USA) Vol. 18:11; ISSN GLGYB; ISSN 0091-7613
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
580000* -- Geosciences
ACTINIDE ISOTOPES
CALIFORNIA
CAMBRIAN PERIOD
CHEMISTRY
FEDERAL REGION IX
GEOCHEMISTRY
GEOLOGIC AGES
GEOLOGIC HISTORY
GEOLOGY
IGNEOUS ROCKS
ISOTOPE RATIO
ISOTOPES
LEAD ISOTOPES
MINERALS
MOUNTAINS
NORTH AMERICA
ORIGIN
OXYGEN COMPOUNDS
PALEOZOIC ERA
PLUTONIC ROCKS
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
STRATIGRAPHY
TECTONICS
TRANSITION ELEMENT COMPOUNDS
URANIUM ISOTOPES
USA
ZIRCON
ZIRCONIUM COMPOUNDS
ZIRCONIUM SILICATES
580000* -- Geosciences
ACTINIDE ISOTOPES
CALIFORNIA
CAMBRIAN PERIOD
CHEMISTRY
FEDERAL REGION IX
GEOCHEMISTRY
GEOLOGIC AGES
GEOLOGIC HISTORY
GEOLOGY
IGNEOUS ROCKS
ISOTOPE RATIO
ISOTOPES
LEAD ISOTOPES
MINERALS
MOUNTAINS
NORTH AMERICA
ORIGIN
OXYGEN COMPOUNDS
PALEOZOIC ERA
PLUTONIC ROCKS
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
STRATIGRAPHY
TECTONICS
TRANSITION ELEMENT COMPOUNDS
URANIUM ISOTOPES
USA
ZIRCON
ZIRCONIUM COMPOUNDS
ZIRCONIUM SILICATES