Isotopic age constraints on middle Paleozoic deformation in the northern Sierra Nevada, California

Journal Article · Sat Aug 01 00:00:00 EDT 1987 · Geology; (United States)

DOI:https://doi.org/10.1130/0091-7613(1987)15<757:IACOMP>2.0.CO;2· OSTI ID:5334765

Saleeby, J; Hannah, J L; Varga, R J

Allochthons of the lower Paleozoic Shoo Fly Complex in the northern Sierra Nevada were assembled and internally deformed prior to formation of a Devonian-Permian island-arc sequence. U/Pb data on zircons indicate ages of 423 +5/-15 Ma for a submarine tuff within the uppermost thrust slice of the Shoo Fly Complex and 378 +5/-10 Ma for a granitic intrusion that may be cogenetic with the lower part of the arc sequence. These data indicate late Early Silurian Shoo Fly deposition and proximity to active volcanism, as well as late Middle Devonian initiation of arc-related magmatism.

• Research Organization: California Institute of Technology, Pasadena (USA)
• OSTI ID: 5334765
• Journal Information: Geology; (United States), Vol. 15:8
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
CALIFORNIA
GEOLOGIC DEPOSITS
DEFORMATION
GEOLOGIC HISTORY
AGE ESTIMATION
DEVONIAN PERIOD
ISOTOPE DATING
LEAD
MAGMATISM
PALEOZOIC ERA
SIERRA NEVADA COLORADO
SILURIAN PERIOD
URANIUM
VOLCANISM
ACTINIDES
ELEMENTS
FEDERAL REGION IX
GEOLOGIC AGES
METALS
MOUNTAINS
NORTH AMERICA
USA
580100* - Geology &amp; Hydrology- (-1989)