Other
Scientific paper
Sep 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37.2075p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 37, Issue 9, pp.2075-2097
Other
5
Scientific paper
In order to determine the chemical composition of the gases from micro-inclusions in allanite a comparative study, using the methods of heating to decrepitation and grinding in vacuum was undertaken. The dependence of gas composition on the grain size was studied, too. The analysis of gases was carried out in a vacuum apparatus for micro-analysis; the measurement was volumetric. The experiments using the decrepitation method were made in the temperature interval 200-1100°C. CO 2 , H 2 , CO, CH 4 , N 2 , He, and water were identified and determined. However, a considerable part of these gases is probably due to chemical reactions. By grinding in a vacuum ball mill, only small amounts of H 2 , N 2 , and He were evolved. Some experiments showed that CO 2 and H 2 O are strongly adsorbed on the ground material, thus being lost for the analysis. The results obtained from these two methods were supplemented with data obtained from a new method for studying the composition of gas inclusions, by tracing the gas composition as a function of the sample grain size. Using an approximate model it was shown that this dependence should be non-linear (hyperbolic). The amount of gases, due to inclusions, decreases parallel to the decrease in size of the mineral grains down to a certain limiting size. This dependence could not be observed if the grains are smaller than this limiting value. The method offers a possibility for taking into account the amounts of gases having another origin (desorption, chemical interactions, etc.), using the experimental plots. The results from the three series of experiments showed that the gas phase of inclusions in examined allanite consists mainly of CO 2 . The other gases which were found by the decrepitation method could not be unambiguously ascribed to inclusions.
Penchev N. P.
Piperov N. B.
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