Computerized Modeling of Rock-Varnish Dating
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a
b
c
d
Fig.3a-d TEM microimages, micro diffraction pictures and dispersive spectra of some minerals from
rock varnish coating: a Mn-Fe montmorillonite; b litiophorite; c Al goethite; d Mg-AI asbolan.
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Mathematical Operations
On the basis of logic informative analysis, it was found that samples having different ages are characterized by dissimilar composition. Logic informative analysis makes it possible to find indicator intervals of elemental content range for
every sign characterizing the samples with a distinct age. Using these intervals,
mathematical rules have been established, which identify the degree of closeness
of every sample to a standard group in by its chemistry.
Analysis of the modification range of indicator intervals for samples with dissimilar ages shows that there is no clear-cut linear tendency to value age from
primary signs. This is also confirmed by data of correlation analysis: coefficient
values in a coefficient matrix of multiple correlation are no more than 0.5. This
testifies to more complicated relationships between rock-varnish chemistry and