Timing and kinematics of deformation in the Cronese Hills, California, and implications for Mesozoic structure of the southwestern Cordillera
- Univ. of Kansas, Lawrence (USA)
- Univ. of Utah, Salt Lake City (USA)
A southeast-vergent ductile shear zone is exposed in the Cronese Hills in the central Mojave Desert. This shear zone formed under greenschist facies conditions and placed mylonitic metaplutonic and metavolcanic rocks upon folded Triassic( ) metasedimentary rocks. U-Pb zircon ages of prekinematic and postkinematic plutons constrain the age of deformation to between 169 and 154 Ma (late Middle or early Late Jurassic). The authors believe that the Cronese shear zone forms part of the southern continuation of the east Sierran thrust system. Mesozoic thrust faults may have controlled preservation of Jurassic arc-related rocks and may be responsible for structural stacking of Paleozoic eugeoclinal and miogeoclinal strata in the central Mojave Desert.
- OSTI ID:
- 6357435
- Journal Information:
- Geology; (USA), Journal Name: Geology; (USA) Vol. 18:6; ISSN GLGYB; ISSN 0091-7613
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
580000* -- Geosciences
ACTINIDE ISOTOPES
AGE ESTIMATION
ARID LANDS
CALIFORNIA
DEFORMATION
DESERTS
FEDERAL REGION IX
GEOLOGIC AGES
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
IGNEOUS ROCKS
ISOTOPE DATING
ISOTOPE RATIO
ISOTOPES
LEAD ISOTOPES
MESOZOIC ERA
METAMORPHIC ROCKS
NORTH AMERICA
PLUTONIC ROCKS
ROCKS
SEDIMENTARY ROCKS
SHEAR
TECTONICS
URANIUM ISOTOPES
USA
VOLCANIC ROCKS