Deep crustral structure in Ukrainian Crystalline Shield

The Age of Sedimentary-Volcanogenic Rocks of the Chortomlyk Iron Deposit, the Middle Dnipro Domain of the Ukrainian Shield

“…In the Middle Dnipro Domain of the Ukrainian Shield, the Chortomlyk, Vysokopillya, Verkhiv tseve, Sura, Konka, Bilozerka, Sofiivka and several smaller greenstone belts are known. They are often considered as rifts developed in the Palaeoarchean-Mezoarchean basement of the Auly Group rocks (Bobrov et al, 2002;Semenenko et al, 1978;Semenenko et al, 1967). The greenstone belts are composed of sedimentary-volcanogenic rocks of the Konka and Bilozerka Groups, that are separated by a unconformity (Semenenko et al, 1967).…”

“…They are often considered as rifts developed in the Palaeoarchean-Mezoarchean basement of the Auly Group rocks (Bobrov et al, 2002;Semenenko et al, 1978;Semenenko et al, 1967). The greenstone belts are composed of sedimentary-volcanogenic rocks of the Konka and Bilozerka Groups, that are separated by a unconformity (Semenenko et al, 1967). The Konka Group is composed mainly of volcanic rocks varying in composition from ultrabasic to felsic, with subordinate sedimentary rocks, while the Bilozerka Group is composed of sedimentary rocks with a small amount of felsic volcanic rocks (Seme nenko et al, 1967;Strueva et al, 1979).…”

“…The Konka Group is composed mainly of volcanic rocks varying in composition from ultrabasic to felsic, with subordinate sedimentary rocks, while the Bilozerka Group is composed of sedimentary rocks with a small amount of felsic volcanic rocks (Seme nenko et al, 1967;Strueva et al, 1979). The rocks of the Konka Group are cut by plagioclase granites of the Sura Complex (3.08-3.0 Ga) (Shcherbak et al, 2006), while the Bilozerka Group is not cut by granite intrusions (Semenenko et al, 1967). Three associations of ferruginous-siliceous rocks have been identified in the greenstone belts of the Middle Dnipro Domain.…”

“…Three associations of ferruginous-siliceous rocks have been identified in the greenstone belts of the Middle Dnipro Domain. These are the ferruginous-siliceous-mafic and ferruginous-siliceous-keratophyre (schist-jaspilite-tholeiite) associations in the Konka Group and the transitional ferruginous-siliceous-shale to ferruginous-siliceous-keratophyre association in the Bilozerka Group, which many researchers compare with the ferruginous-siliceous formations of Kryvyi Rih Group (Semenenko et al, 1978;Semenenko et al, 1967;Sivoronov et al, 1990). The rocks of the early ferruginous-siliceous-mafic association are a few tens of meters thick and are found among the volcanogenic rocks of the komatiite-tholeiitic association.…”

“…The Chortomlyk greenstone belt is a northeast-trending syncline with a total width of 15-18 km and an area of up to 500 km 2 (Semenenko et al, 1978;Semenenko et al, 1967) (Fig. 1).…”