Experimental study of the crystallization conditions of ailikites in the Ilbokich uplift of the Siberian platform
DOI:
https://doi.org/10.17308/geology/1609-0691/2026/3/62-74Keywords:
ultramafic lamprophyre, aillikite, experiment, melts, upper mantle, peridotiteAbstract
Introduction: the object of this article is the ultramafic lamprophyres, whose low-power dikes were discovered during drilling within the Riphean Irkineevo-Chadobetsky trough of the Ilboki Upland on the southwestern edge of the Siberian Craton. Experimental studies of ultramafic lamprophyres (in this case, ailikites) have not been conducted before. Such studies will allow us to identify mineral parageneses that crystallized at different pressures and thus compare them with the conditions of lamprophyre formation. The objective of this work is to experimentally study the phase associations of the ailikites of the Irkineevo-Chadobetsky depression at various pressures. Based on the mineralogical, petrographic, and thermobarometric results obtained for these rocks, two pressure and temperature ranges were selected for the experiments: 4−5 GPa/1000−15000C and 2.5 GPa/1000−11000C.
Methodology: the experiments used the powder of the least altered sample of Ilb28 ailikit, selected in the gas condensate field Ilbokichskoe-3. Experiments at 4.0 and 5.0 GPa were carried out on the anvil-hole type apparatus NL-13T with a toroidal seal based on a press with a force of 500 tons, and at 2.5 GPa – on the cylinder-piston apparatus CP-40. The analysis of the experimental products was carried out using a CamScan MV 2300 (VEGA TS 5130MM) electron microscope equipped with EDS INCA Energy 350 and a Tescan VEGA-II XMU equipped with EDS INCA Energy 450 and WDS Oxford INCA Wave 700 at the D.S. Korzhinsky Institute of Experimental Mineralogy of the Russian Academy of Sciences (IEM RAS).
Results and discussion: experiments at 2.5 to 5.0 GPa revealed phase associations that may be characteristic of ailikites under various P-T conditions. The phase association at 5.0 GPa differs significantly from the natural ailikite association. At 4.0 and 2.5 GPa, the phase associations of Ol+Cpx+Phl are similar and differ only in the quantitative ratios of these phases. These associations are similar to the natural ailikite association, and the compositions of the phases at these pressures are most similar to the compositions of minerals in ailikite. All of this indicates that the pressures at which the ailikite mineral associations were formed did not exceed 4.0 GPa, but they could have formed over a wide temperature range.
Conclusion: the study of the obtained mineral associations showed that the indicated TiO2- and F-rich ultramafic lamprophyres were formed at pressures not exceeding 4.0 GPa. The indicator phases are Ti-F-containing clinohumite and Ti-containing garnet, which appear at a pressure of 5.0 GPa.
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