Analytical Geochemistry Research Laboratory

Mineral Analysis

   The AGRL has a Rigaku X-Ray Diffractrometer (XRD) for powder diffraction.  By diffracting Cu Ka X-rays through the crystal structure, the distance between planes of atoms can be measured; these distances (d-spacings) are used to identify minerals and measure changes in mineral structures under different experimental conditions.

Chemical Analysis of Materials

   The AGRL is home to a Rigaku ZSX-100e X-Ray Fluorescence Spectrometer (XRF).  This instrument uses Rh X-rays to excite atoms in a material to produce characteristic X-rays; the concentration of an element is proportional to the number of X-rays emitted.  The XRF can analyze most of the periodic table in solid and liquid samples.  Most of the work with the XRF supports petrologic research in the Department of Geological Sciences and is done on 2:1 dilutions on fused beads in graphite crucibles.

Geochronology

   Sample preparation is the most time-consuming part of geochronologic analysis.  The AGRL is developing a series of labs that will enable us to take rock samples and separate out datable minerals for analysis by 40Ar/39Ar and Pb isotope (zircon) techniques.  Currently, the AGRL includes a jaw crusher, steel plate, and shaker table.  A magnetic separator will be added in the future.