The Arizona LaserChron Center is an NSF multi-user facility that is designed to address problems in Earth Science through the generation of U-Th-Pb geochronologic data and complementary geochemical information by LA-ICPMS. Our primary goals are as follows:
- Maintain a facility that generates U-Th-Pb ages and Hf isotope ratios of the best precision and accuracy available from a Laser-Ablation Multicollector ICP Mass Spectrometer.
- Provide opportunities for researchers from around the world (and especially NSF-supported scientists) to use our instruments and expertise to address geologic problems.
- Push the development of new applications of laser ablation ICP mass spectrometry.
- Provide opportunities for researchers and students to learn the theory and analytical techniques of U-Th-Pb geochronology while acquiring geochronologic information.
The main instrument utilized at the Arizona
LaserChron Center is a Nu Plasma HR MC-ICPMS which is
dedicated to geochronological and geochemical research in the ALC. The
instrument was installed in February 2009 and is used primarily to measure U-Th-Pb ages and Hf isotope ratios. We have
worked closely with Nu Plasma engineers to design a new
collector block that is optimized for analysis of U-Th-Pb and Hf isotopes. Twelve faraday
collectors are arranged to measure 238U, 232Th, and 180-171 (for Hf,
Lu, and Yb), whereas four low-side ion counters measure
208-204Pb. All Faraday collectors are equipped with 3x1011 ohm
resistors for enhanced signal/noise at low signal intensity. A 2010 Photon Machines Analyte G2 excimer laser, equipped with a HelEex ablation chamber, is connected to the Nu ICPMS.
Please contact Mark Pecha (email@example.com), manager of the ALC, for information about analytical methods, schedules, costs, support letters, etc.