Center for Meteorite Studies

DSCN3379The Isotope Cosmochemistry and Geochronology Laboratory (ICGL) is one of only a few isotope laboratories in the U.S. dedicated to the analysis of meteorites. It consists of a 1,000 sq. ft. clean chemistry laboratory and a neighboring mass spectrometer facility. 

Isotopic Analysis

Most chemical elements consist of more than one isotope (isotopes are atoms of a given element with a particular number of neutrons).

Commonly known examples include 12C, 13C and 14C, the three naturally occurring isotopes of carbon, and 235U and 238U, the two naturally occuring isotopes of uranium (which are both radioactive).

DSCF3123We measure the abundance of the radiogenic "daughter" products of short- (e.g., 26Al, 60Fe, 146Sm) and long-lived radioactive isotopes (e.g., 147Sm, 176Lu, 238U), relative to stable, non-radiogenic isotopes of the same elements to determine the age of a mineral or rock.

We also measure the mass-dependent fractionation of light from heavy isotopes as a tracer of processes that may have occurred during the early history of the Solar System, such as evaporation, condensation, and alteration processes.

The ratio of an isotope produced by radioactive decay to one that is non-radiogenic (i.e., not produced by radioactive decay) and not radioactive itself, can be used to determine the age of a sample. More precisely, it allows the time elapsed since the sample was last isotopically homogeneous (as in a magma, for example) to be determined.

Ultra-clean conditions are essential to the functioning of the ICGL. These are provided, first, by a dedicated air handler supplying class 100 air, meaning the air contains fewer than 100 particles per cubic foot (normal air contains millions of particles per cubic foot). 

ImageThe lab also contains over 30 linear feet of ultra-clean laminar flow cabinets and hoods providing class 100 and better conditions. These are used to perform preparation and chemical processing of meteorite samples. 

In addition, water used in our laboratory undergoes three different purification steps to bring the background concentrations of most elements down to the parts-per-quadrillion level (a quadrillion is 1,000,000,000,000,000). 

Lastly, the acids we use to dissolve meteorites and for chemical processing of samples are distilled multiple times and contain only a few parts per trillion of most elements. 

All of these precautions are necessary to make sure that data we produce are free of artifacts caused by terrestrial contamination in the laboratory.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


Comments are closed.

Facebook
Twitter
YouTube

Sign Up for Center Updates!

Be the first to learn about CMS events and news; sign up for email updates here!


Postdoctoral Scholar Opportunities!

The Center for Meteorite Studies at Arizona State University invites applications for 2 Postdoctoral Research Associates.  Click here for details!




Meteorite of the Month

Moss

July’s Meteorite of the Month is Moss, a CO3.6 carbonaceous chondrite that fell the morning of July 14, 2006, in Østfold, Norway. According to the Meteoritical Bulletin (MB 91): At …


Upcoming Events

July 2017
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
June 25, 2017 June 26, 2017 June 27, 2017 June 28, 2017 June 29, 2017 June 30, 2017 July 1, 2017
July 2, 2017 July 3, 2017 July 4, 2017 July 5, 2017 July 6, 2017 July 7, 2017 July 8, 2017
July 9, 2017 July 10, 2017 July 11, 2017 July 12, 2017 July 13, 2017 July 14, 2017 July 15, 2017
July 16, 2017 July 17, 2017 July 18, 2017 July 19, 2017 July 20, 2017 July 21, 2017 July 22, 2017
July 23, 2017 July 24, 2017 July 25, 2017 July 26, 2017 July 27, 2017 July 28, 2017 July 29, 2017
July 30, 2017 July 31, 2017 August 1, 2017 August 2, 2017 August 3, 2017 August 4, 2017 August 5, 2017