International Geologiical Congress - Oslo 2008


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PIP-04 From gas and dust to planets


Investigation of the planetary material microsamples: Methods and means


Gennady Kolesov, Vernadsky Institute of Geochemistry and Analytical Chemistry (Russian Federation)
Akvelina Lyul', Vernadsky Institute of Geochemistry and Analytical Chemistry RAS (Russian Federation)


Methodology of microobject analysis is proposed *.
The investigation method of their chemical composition are considered. Preference is returned to the instrumental neutron-activation method (predominantly with the use of reactor neutrons). Its possibilities and special features of their application are examined. Computer programs are developed, optimization of the method is carried out; analysis conditions are calculated (sample mass, irradiation, cooling and measurement time). The detection limits and an error of the analysis are evaluated. The utilized measuring equipment is described.
Uniqueness of the microobjects according to the form, weight (usually about several milligrams and below), sizes and properties, methods of their detection and sampling are reported; mainly they are the followinq: components of meteorites, chondrules, grain of minerals, cosmic dust, ultra-refractory inclusions in carbonaceous chondrites or "mysterite" in the nonequilibrium chondrites; particles of matter from the meteorite impact areas or astroblemes; lunar soil, the products of experimental studies, condensate films or the solutions, precipitated to the base layer, hot particles from Chernobyl accident region etc.
We point out that the determination of chemical composition and identification of such objects are difficult. Their analysis is possible either by a direct study of individual samples, or (if samples of unknown or less then milligram mass) together with the base layer, on which they are located (for example, condensate films). All this requires special a approach to its analysis.
The used methodology, the system approach to the analytical operations makes it possible the successfull determination of up to 30-40 elements (at level 1.0% - 1.0 ppb) in the samples of above mentioned objects and to obtain valuable information on their chemical composition necessary for petrology (geochemistry and cosmochemistry).
The reported investigations testify the expedience of using the similar concept and procedure in the analysis of microobjects.

This study was supported by RFBR, Grant No 06-03-32896- a.

*Kolesov G.M. Aspects of the methodology of the analysis of natural samples and industrial materials. Abstacts of II Russian conference on analytical chemistry "Analytics of Russia", 7-12 October 2007, Krasnodar. p. 351.


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