40Ar/39Ar Thermochronology for Submilligram Samples Using a Ta Platform Microfurnace, With Illustrations From the Bushveld Complex

Jacob B. Setera, Brent Turrin, Gregory F. Herzog, Jill Van Tongeren, Jeremy S. Delaney, Carl C. Swisher

Research output: Contribution to journalArticlepeer-review

Abstract

We present a method for 40Ar/39Ar step-heating measurements on anhydrous K-bearing minerals. Samples placed in dimples on Ta foil platforms are heated indirectly with a laser while temperatures are measured with a two-color pyrometer. The system provides a simple, inexpensive, and reliable means for the heating of samples as small as a few to tens of micrograms. Results for plagioclase separates from the Rustenburg Layered Suite of the circa 2.06 Ga Bushveld Complex closely match previously published data.

Original languageEnglish (US)
Article numbere2020GC009182
JournalGeochemistry, Geophysics, Geosystems
Volume21
Issue number10
DOIs
StatePublished - Oct 1 2020

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Keywords

  • Bushveld
  • geochronology
  • thermochronology

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