PETROLOGY, GEOCHEMISTRY AND ORE POTENTIAL OF ULTRAMAFIC DYKES OF THE NOVOUKRAINKA DYKE FIELD (INGUL TERRAIN OF THE UKRAINIAN SHIELD)

UDC 55(477) + 551.22 + 550.4
https://doi.org/10.15407/mineraljournal.38.01.042

Mitrokhin A.V. 1, Vishnevskaya E.A. 1, Gatsenko V.A. 2, Mitrokhina T.V. 1, Mihalchenko I.I. 2, Shumlyanskyy L.V. 2

1 Taras Shevchenko Kyiv National University

90, Vasylkivska Str., Kyiv, Ukraine, 03022

Е-mail: mitrokhin.a.v@yandex.ua; genyvishnevskia@mail.ru; tanussa@ukr.net

2 M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of NAS of Ukraine

34, Acad. Palladina Pr., Kyiv-142, Ukraine, 03680

E-mail: vera.gatsenko@ukr.net; alcoldan@i.ua; lshumlyanskyy@yahoo.com

PETROLOGY, GEOCHEMISTRY AND ORE POTENTIAL OF ULTRAMAFIC DYKES OF THE NOVOUKRAINKA DYKE FIELD (INGUL TERRAIN OF THE UKRAINIAN SHIELD)

Language: Russian

Mineralogical Journal 2016, 38 (1): 42-57

Abstract: The objects of the research are ultramafic dykes that intruded the Paleoproterozoic granites of the Novoukrainka Pluton (NP) within the Ingul terrain of the Ukrainian Shield. Along with more numerous dykes of the dolerite-diabase association these ultramafites form the Novoukrainka dyke field (NDF) that is located in the south-western part of the NP at the north-western end of the Bobrynets Dyke Belt. The goal, data and methods of research. The main goals of the research were the specification of the geological position and belonging to some rock association for NDF ultramafites, as well as, the determination of petrological condition of their formation and ore potential. The core samples were studied elaborating optical and electron microscopy, the electron probe microanalysis, ICP-MS methods and wet chemical analysis. Obtained results and conclusions. It is established that the NDF ultramafites in contrast to the rocks of the dolerite-diabase association were subjected to intensive post-magmatic alteration including actinolitization, biotitization and albitization. Local manifestations of the alkaline Na metasomatism in the NDF ultramafites are attributed by authors to the processes of formation of U-bearing albitites that are common in the area. Therefore the age of the ultramafic dykes is limited by emplacement of the NP (2.03—2.04 Ga) and formation of the U-bearing albitites (1.81 Ga). Relict paragenesises of mafic and accessory mineral that are characteristic of subalkaline magmas as well as a number of geochemical characteristics all testify to initially increased alkalinity of the NDF ultramafites. Along with the more ancient age, affinity to the subalkaline series and the petrographic specificity of the NDF ultramafites allow their identification as representatives of the separate dyke rock association that is essentially different from the dolerite-diabase association and that is not linked to the latter by a common process of magmatic evolution. The discovered Ti-V metallogenic specialization of the NDF ultramafites can represent a certain industrial interest provided by "operation" of the natural mechanism of gravitational fractionation of the ilmenite and a Ti-magnetite that able to take place in larger intrusive bodies.

Keywords: petrology, dyke rock, ultramafites, ultrabasites, the Ukrainian Shield.

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