O.V. Dubyna, GEOCHEMISTRY OF PALEOPROTEROZOIC HIGH-POTASSIUM ROCKS FROM THE VERBKA INTRUSION (UPPER BUG REGION, UKRAINIAN SHIELD): PETROGENESIS, TECTONIC SETTING OF EMPLACEMENT AND MINERALIZATION
https://doi.org/10.15407/mineraljournal.48.02.064
UDC 550:552.33(477)
GEOCHEMISTRY OF PALEOPROTEROZOIC HIGH-POTASSIUM ROCKS FROM THE VERBKA INTRUSION (UPPER BUG REGION, UKRAINIAN SHIELD): PETROGENESIS, TECTONIC SETTING OF EMPLACEMENT AND MINERALIZATION
O.V. Dubyna 1, 2, DrSc (Geology), Associate Professor
E-mail: dubyna_a@ukr.net; orcid: 0000-0002-6003-4873
S.G. Kryvdik 1, DrSc (Geology, Mineralogy), Prof.
E-mail: kryvdik@ukr.net; orcid: 0000-0002-8356-1115
І.А. Shvaika 1, PhD (Geology), Research Fellow
Email: ishvaika@gmail.com; orcid: 0000-0001-9585-4380
I.D. Shvaika 1, Junior Research Fellow
Email: igor.d.shvayka@gmail.com; orcid: 0000-0002-1908-6639
L.I. Proskurka 1, Research Fellow
Email: igmrproskurko@gmail.com; orcid: 0000-0001-5760-2000
1 M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
2 Taras Shevchenko National University of Kyiv
Educational-scientific institute "Institute of Geology"
90, Vasylkivska Str., Kyiv, Ukraine, 03022
Language: English
Mineralogical journal 2026, 48 (2): 64-84
Abstract: Small Paleoproterozoic (2.0 Ga) massifs (up to several km2) or stocks of high-potassium, two-pyroxene pyroxenite-shonkinite-syenite series occur within the Upper Bug region. While the full extent of their distribution in this region remains unconstrained, these intrusive rocks are coeval with small alkaline intrusions, quartz and alkaline syenite stocks, and apatite-enriched potassic gabbroids within this part of the Ukrainian Shield. All investigated samples exhibit high K2O contents (3—8 wt.%) and K2O/Na2O ratios (>2.5), indicating they are alkaline and ultrapotassic rocks. Normative olivine consistently appears in the shonkinites and pyroxenites despite its absence in thin sections. Similarly, modal feldspathoids were not observed, although normative nepheline and leucite occur in pyroxenite samples. The presence of these normative phases is attributed to the high phlogopite content in the pyroxenites; in SiO2-rich rocks, the chemical components of phlogopite are partitioned into normative feldspar, olivine, and pyroxenes. Notably, all samples — including leucocratic syenites — exhibit unusual P2O5 enrichment (up to 2.1 wt.%). The investigated rocks are significantly enriched in LILE (Rb 242—336 ppm, Ba 2278—8470 ppm) and LREE (total REE up to 1260 ppm, La 88—240 ppm showing steep fractionation (La/Yb)C = 37—78). In contrast, they exhibit marked depletion in HFSE, characterized by prominent negative Nb-Ta, Zr-Hf, and Ti anomalies. Trace-element distribution patterns and REE equilibrium-melting models suggest that the primary magmatic melts were derived from a metasomatized lithospheric mantle source via low-degree partial melting of garnet peridotite or garnet harzburgite. The coupled HFSE-Ti depletion and LILE-LREE enrichment are diagnostic of ultrapotassic alkaline melts generated in a subduction-related setting. Their compositions are likely analogous to potassic basalts or shoshonites. It is assumed that dehydration of subducted material triggers partial melting at reduced temperatures. This process releases fluids and melts that facilitate mantle metasomatism and subsequent partial melting of the overlying peridotites. The co-occurrence of apatite-bearing potassic gabbroids and pyroxenites at the Holoskiv intrusion with coeval potassic rocks at the Verbka intrusion may indicate a shared genetic origin. These suites likely evolved from similar parent melts through deep-seated differentiation. Furthermore, the presence of the Verbka potassic rocks may indicate that Holoskiv-type apatite gabbroids are more widely distributed throughout the Bug region than previously recognized.
Keywords: high potassic magmas, shonkinite, syenite, apatite, subduction, Paleoproterozoic, Bug region, Ukrainian Shield.
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