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watertable

The BSU IGL is a node in the EARTHTIME Network for the Calibration of Earth History. In the spirit of teamwork and cooperation fostered by the EARTHTIME Initiative, please take a look at our developing archive of analytical procedures used in the BSU IGL for isotope geochemistry and geochronology*.

*Disclaimer: While the information below represents the accumulated knowledge and practices used in the BSU IGL, the laboratory and affiliated staff are not responsible nor liable for errors of omission or otherwise. Procedures are always being refined, so these files are periodically updated.

Helpful Hints Blog!

  • Enhanced UPbR data reduction spreadsheet December 6, 2016 A more sophisticated UPbR data reduction (Schmitz and Schoene, 2007) sample template file containing enhancements like weighted mean calculation, comprehensive Th/U disequilibrium correction alternatives, outlier rejection calculations, and analysis of variance graphs is now available as BSULab_UPbR17-2_Anyone.xls.
  • Barite removal from heavy mineral separates April 8, 2014 Barite is an occasional voluminous component of the non-magnetic heavy mineral fraction of altered volcanic tuffs and sandstones, and can swamp out the target zircon population.  Unfortunately barite is remarkably immune to dissolution in strong mineral acids. To quantitatively remove this barite, we have modified the method described by Breit et al. (Chemical Geology, 52:333-336, ...
  • Ultrasonic Clay Separator Device and Manuscript November 22, 2013 This published manuscript (clay_separator_v3s) describes an efficient method for high-volume heavy mineral separation from clay-rich rocks using an ultrasonic probe. The ultrasonic clay separator (UCS) is an easily constructed device that allows for the recovery of high density minerals, as small as 10 microns, with a minimum of sample preparation. Recovery of heavy minerals from ...
  • Effects of high-T annealing on CL emission November 22, 2013 These SEM-based cathodoluminescence (CL) photomicrographs of zircon crystals illustrate the positive enhancement of CL emission resulting from high-temperature (900°C) annealing for 60 hours. All four rows of zircon crystals are from the same 1.1 Ga granitoid, and contain 100 to 200 ppm U and 150 to 250 ppm Th.  The upper two rows contain crystals ...
  • New instructional resources in the LabShare archive! September 7, 2013 New slideshows and instructional videos are now available in LabShare! These resources demonstrate the methods we use in the IGL for both ID-TIMS and LA-ICPMS U-Pb zircon geochronology.

See all labshare hints!