University of Minnesota
Department of Geology and Geophysics

Minnesota Isotope Group



The Minnesota Isotope Group studies a wide range of timescales, from millions of years ago to modern.  We are well equipped with a variety of lab space, mass spectrometers and other equipment.  Please peruse these pages for further information on research interests and capabilities. 




Trace Metal Isotope Geochemistry Group 

Limnological Research Center

David Fox’s Group






Larry Edwards 

David Fox

Emi Ito


· Hai Cheng, TIMS Lab Manager

· Maniko Kamei, Stable Isotope Lab Manager

· Victor Zabielski

    Graduate Students:

· Rebecca Clotts

· Carolyn Dykoski

· Megan Kelly

· Sam Matson

· Sushmita Ray

· Mark Shapley

· Rebecca Thomas

· Laura Triplett

· Xianfeng Wang



Minnesota Isotope Laboratory

· TIMS facility:

· Thermal ionization mass spectrometers with multiple cups, high-abundance sensitivity and ion-counting capabilities.

· An inductively coupled plasma magnetic sector mass spectrometer.

· Clean rooms for purification and separation of trace metals.

· Stable Isotope Laboratory facility:

· Finnigan MAT Delta E mass spectrometer

· Finnigan MAT 252 mass spectrometer with Kiel device (to measure isotope ratios of C, N, O and S; the Delta E also can measure HD ratios)

· Diurnal incubators

· Circulating and shaking water baths

· Analytical balances

· Muffle furnace and drying ovens

· Vacuum extraction lines supporting stable isotope analysis of carbonates (C, O), water (O, H, DIC), silicates and oxides (O), and organic material (O, C).


Limnological Research Center

· State-of-the-art Sediment Core Research Facility (an NSF National Facility)

· Field  systems for collection of cores from diverse lake types

· Integrated Core Studies Laboratory comprising:

· A: Initial Core Description stations including multi-sensor logging, splitting,  microscopy, photo-digital documentation, laser-grain size.

· B: Geochemical Stratigraphy stations including inorganic and organic carbon couloumetry, sulfur, and biogenic silica

· C: Optical microscopy lab with stations for paleoecology, organic and mineral petrography, and fluorescence

· D: Special studies stations including AMS Radiocarbon target preparation, digital image and spectral analysis, and sample separations for external analyses.

· E: Library of sediment cores from lakes worldwide


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