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Posts dealing with news and events in the Isotope Geology Lab

IGL News

Enhanced UPbR data reduction spreadsheet

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. (Read More) Enhanced UPbR data reduction spreadsheet

“ZirChron” app updated with new sample suites

We have added new suites of zircons from a variety of rhyolite tuffs and lavas to the “ZirChron” app in the Education and Outreach page.  These new samples broaden the characteristics of the zircon suites that students can experiment with, … (Read More) “ZirChron” app updated with new sample suites

New in Geology – “A newly identified Gondwanan terrane in the northern Appalachian Mountains”

Mountain-building and the end of an ancient ocean beneath modern New England (Read More) New in Geology – “A newly identified Gondwanan terrane in the northern Appalachian Mountains”

Barite removal from heavy mineral separates

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 … (Read More) Barite removal from heavy mineral separates

Ultrasonic Clay Separator Device and Manuscript

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 … (Read More) Ultrasonic Clay Separator Device and Manuscript

Effects of high-T annealing on CL emission

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 … (Read More) Effects of high-T annealing on CL emission

New instructional resources in the LabShare archive!

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. (Read More) New instructional resources in the LabShare archive!

New geochronology on Marinoan glaciation published in Geology

Between roughly 650 and 635 million years ago, most – if not all – of the Earth was covered by ice and snow.  Dating of rock units formed immediately after the glaciation ceased suggests that the termination of this Marinoan … (Read More) New geochronology on Marinoan glaciation published in Geology

Oligocene primate geochronology featured in ‘Nature’

Measurements of minuscule amounts of naturally occurring uranium and lead in volcanic minerals made by Mark Schmitz in the Department of Geosciences have helped an interdisciplinary team of paleobiologists and geologists push the age of divergence of apes and Old … (Read More) Oligocene primate geochronology featured in ‘Nature’

ELEMENTS issues “One Hundred Years of Geochronology”

The science of isotope geochronology turns 100 years old in 2013 and at the recommendation of IGL Director Mark Schmitz and British scientist Dan Condon, Elements magazine is marking the anniversary with the theme “One Hundred Years of Geochronology.” The … (Read More) ELEMENTS issues “One Hundred Years of Geochronology”