L.V. Shumlyanskyy, O.V. Mytrokhyn, J.-C. Duchesne, S.V. Bogdanova, K. Billström, A.M. Omelchenko, B. Bagiński. Petrology of Subalkaline Dolerite Dykes of the Korosten Complex, North-Western Region of the Ukrainian Shield

UDC  552.323 + 550.42 (546.42 +.657 +.81)
L.V. Shumlyanskyy 1, O.V. Mytrokhyn 2, J.-C. Duchesne 3, S.V. Bogdanova 4, K. Billström 5, A.M. Omelchenko 2, B. Bagiński 6
1M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
Е-mail: lshumlyanskyy@yahoo.com
2 Taras Shevchenko Kyiv National University. Educational-scientific institute "Institute of Geology"
90, Vasylkivska Str., Kyiv, Ukraine, 03022
Е-mail: mitr@univ.kiev.ua, alnika@ukr.net
3 Liege University, Department of Geology
B-4000 Sart Tilman, Université de Liège, Belgium
E-mail: jc.duchesne@ulg.ac.be
4 Lund University, Department of Geology
12, Sölvegatan, Lund, Sweden 223 62
Е-mail: svebog@yandex.ru,
5 Swedish Museum of Natural History
Box 50 007, Stockholm, Sweden, SE-10405
Е-mail: kjell.billstrom@nrm.se
6 Warsaw University
93, al. Żwirki i Wigury, Warszawa 02-089, Polska
Е-mail: b.baginski1@uw.edu.pl
Mineralogical journal 2018, 40 (1): 32-52
Abstract: The North-Western region of the Ukrainian Shield hosts numerous dykes varying widely in terms of their age and composition. One of the distinguished group of dykes embraces subalkaline basic rocks that belong to the Palaeoproterozoic (1815—1740 Ma) Korosten anorthosite-mangerite-charnockite-granite plutonic complex. Based on geological relationships with rocks of the Korosten complex and geochronological data, it is indicated that dykes were repeatedly emplaced at c. 1800, 1760 and 1750 Ma. Swarms of subalkaline mafic dykes are also found at a large distance from the Korosten plutonic complex that indicates the large areal distribution of igneous activity of this type. In terms of geochemistry, these dykes are characterized by low #Mg (24.5—39), low SiO2 (46—54 wt. %), and high TiO2 (1.7—3.8 wt. %), CaO (5—8 wt. %), K2O (1.0—3.1 wt. %), and P2O5 (up to 1.9 wt. %). Dykes of the Korosten complex are enriched in incompatible trace elements (Rb, Zr, REE) and heavily depleted in compatible elements (Ni, Cr, Cu, V), and in strontium. The REE pattern is rather fractionated and [La/Yb]N varies from 5 to 14. εNd (1760 Ma) ranges from –1.6 to 1.6, while εSr (1760 Ma) varies from –5 to 19, with exception of two dykes that have much more radiogenic Sr isotope composition. The lead isotope composition embraces a wide range from unradiogenic (206Pb/204Pb = 16.2) to radiogenic (206Pb/204Pb = 20.2) values. The composition of rock-forming minerals in subalkaline dykes is close to that of anorthosites that constitute a major phase of the Korosten plutonic complex. This indicates that cumulative minerals of anorthosites had crystallized from melts that were close in composition to the subalkaline dykes. The evolution of the dyke chemistry is defined by the fractional crystallization of plagioclase and olivine. The residual melt is getting enriched in those components that constitute K-feldspar and in incompatible elements that accumulate in the accessory minerals. The REE patterns suggest that the source of the initial melts for subalkaline mafic dykes contained garnet-bearing rocks (granulites?). The distribution of trace elements indicates a crustal origin of the primary melts. In terms of their composition, the dyke rocks of the Korosten plutonic complex are similar to jotunites that occur in the Rogaland anorthosite province, and in some other anorthosite provinces worldwide.
Keywords: subalkaline dolerite, dykes, Palaeoproterozoic, the Ukrainian Shield.

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