ON THE AGE OF THE CHARNOCKITOIDS OF THE TASHLYK COMPLEX OF THE INHUL REGION OF The UKRAINIAN SHIELD

Abstract

Zircons from charnockitoids of the Tashlyk complex from the Pryinhul syncline were studied and dated in order to determine their chronostratigraphic position. Zircons of two age generations were identified, namely the Early Archean (ca. 3 Ga) and the Early Proterozoic (2.0±0.1 Ga). The presence of the former generation indicates that the protolith for charnockites have been represented by the rocks older than the Spasove Series, which is considered to be Proterozoic in age. At ca. 2.0±0.1 Ga Archean rocks together with rocks of the Inhul-Inhulets Series, underwent granulite metamorphism. This event resulted in crystallization of the second (Paleoproterozoic) generation of zircon in charnockites. Archean zircons found in the rocks of the Tashlyk complex, which correspond morphologically to granitoid of the amphibolite facies, differ from Eoarchean zircons in enderbites of the Haivoron complex, which partially retain their appearance during the Neoarchean and Paleoproterozoic tectonic-magmatic events.

Detrital Zircon Geochronology of the Volyn-Orsha Sedimentary Basin in Western Ukraine: Implications for the Meso-Neoproterozoic History of Baltica and Possible Link to Amazonia and the Grenvillian—Sveconorwegian—Sunsas Orogenic Belts

“…For instance, 1800-1740 Ma zircons are absent in the studied sample, whereas this age interval corresponds to the time of active intraplate magmatism in the Ukrainian Shield [56][57][58]. Zircons with ages of 2150-2050 Ma are also absent in the studied sample, whereas rocks of this age are widely distributed in the Ukrainian Shield [59][60][61][62]. The studied sample contains a small number of ca.…”

Detrital Zircon Geochronology of the Volyn-Orsha Sedimentary Basin in Western Ukraine: Implications for the Meso-Neoproterozoic History of Baltica and Possible Link to Amazonia and the Grenvillian – Sveconorwegian – Sunsas Orogenic Belt

“…For instance, 1800-1740 Ma zircons are absent in the studied sample, whereas this age interval corresponds to the time of active intraplate magmatism in the Ukrainian Shield [55,56,57]. Zircons with ages of 2150-2050 Ma are also absent in the studied sample, whereas rocks of this age are widely distributed in the Ukrainian Shield [58,59,60,61]. The studied sample contains a small number of ca.…”