New insights into migration of the Cretaceous Sierran arc using highprecision U-Pb geochronology Public Deposited

Analytics

Downloadable Content

Download PDF
Last Modified
  • March 22, 2019
Creator
  • Beck, Courtney
    • Affiliation: College of Arts and Sciences, Department of Geological Sciences
Abstract
  • A compilation of 254 U-Pb zircon and K-Ar and Ar-Ar biotite ages for the central Sierra Nevada batholith, CA, shows no record of monotonic west-to-east migration of magmatism during the Cretaceous. Rather, spatial age variation in the central Sierra Nevada batholith is dominated by 1) a stepwise shift of the locus of magmatism 2) a west-to-east migration to the end of magmatism and 3) patterns within intrusive suites that reflect local crustal deformation. The step in magmatism was contemporaneous with the beginning of the Sierra Crest magmatic event and beginning of deformation along ductile shear zones in the eastern Sierra. At ~102 Ma, a laterally extensive shear zone formed along the eastern margin of the Cretaceous batholith and was localized and dissected by Sierra Crest plutons. Central Sierran biotite ages cluster between ~78 and 90 Ma and may reflect batholith-wide exhumation or cooling related to waning of local magmatism.
Date of publication
Keyword
DOI
Resource type
Rights statement
  • In Copyright
Note
  • Includes supplemental video.
Advisor
  • Coleman, Drew S.
Degree
  • Master of Science
Graduation year
  • 2013
Language
Publisher
Parents:

This work has no parents.

Items

Thumbnail Title Date Uploaded Visibility Actions
Default New insights into migration of the Cretaceous Sierran arc using high-precision 2019-04-10 Public
Kd17ct62b?file=thumbnail New insights into migration of the Cretaceous Sierran arc using high-precision 2019-04-10 Public