Petrogenetic and tectonic significance of xenocrystic Precambrian zircon in Lower Cambrian tonalite, eastern Klamath Mountains, California

Journal Article · Thu Nov 01 00:00:00 EST 1990 · Geology; (USA)

DOI:https://doi.org/10.1130/0091-7613(1990)018<1057:PATSOX>2.3.CO;2· OSTI ID:5796849

Wallin, E T ^[1]

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1. 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), Vol. 18:11; ISSN 0091-7613
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
CALIFORNIA
MOUNTAINS
GEOCHEMISTRY
TECTONICS
CAMBRIAN PERIOD
GEOLOGIC HISTORY
GEOLOGY
ISOTOPE RATIO
LEAD ISOTOPES
ORIGIN
PLUTONIC ROCKS
STRATIGRAPHY
URANIUM ISOTOPES
ZIRCON
ACTINIDE ISOTOPES
CHEMISTRY
FEDERAL REGION IX
GEOLOGIC AGES
IGNEOUS ROCKS
ISOTOPES
MINERALS
NORTH AMERICA
OXYGEN COMPOUNDS
PALEOZOIC ERA
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
USA
ZIRCONIUM COMPOUNDS
ZIRCONIUM SILICATES
580000* - Geosciences