Evaluating the diamondiferous potential of unaltered kimberlites by the population models of their composition

摘要: 430 chemical analyses of rocks and their diamondiferous potential are used to identify correlations between the petrochemical parameters. Samples for this research were collected from selected intervals core materials, which also examined diamond content (a few samples each interval), Nyurbinskaya, Botuobinskaya, Internatsional’naya, Mir, Aikhal, Yubileinaya, Satykanskaya, Udachnaya-West, Udachnaya-East pipes. Typochemical indications TiO2 K2O concentrations CaO/MgO ratio. System models developed kimberlites allowed distinguishing two trends compositional variability. One is defined by negatively correlated rocks. This trend discrete can be statistically justifiably subdivided into seven segments, represents a population compositions produced under similar physicochemical conditions. Experimental data confirm that closely related potential. Diamond richest practically free TiO2, whereas poorest ones contain as much 3% oxide. The former latter at greatest shallowest depths, respectively. other exhibited in all populations subdivides them groups (varieties populations) with systematically decreasing parameter nonlinearly potential, its increase corresponds systematic melting temperature source material. Certain kimberlite anomalously high concentrations, perhaps, because mantle metasomatism or presence fragments oceanic crustal material magma generation region. In these instances, numerous diamonds could crystallize parental melts pressures (>100 kbar). paper presents statistical analysis pair regressions contents indicative oxides graphical multiple-link model major Tests predictions on basis parameters accurate 85–90% instances.