Abstract
The Dzabkhan terrane, represented by the basement of the Tsaganolom Formation carbonate sequences referring to the Ediacaran shelf cover, was considered as an ancient cratonic fragment in the structure of the Central Asian Fold Belt. It was assumed that its sequences marked the regional unconformity between the Early and Late Precambrian deposits. However, the occurrence of the Tsaganolom Formation rocks on high-temperature metamorphic rocks is established only in the Bogdoingol block (eastern part of the Dzabkhan terrane), where dolomites unconformably superimpose migmatized gneisses and intruding granitoids, for which the age of 717 ± 5 Ma was determined. Synmetamorphic quartz diorites with zircon age of 847 ± 3 Ma (U–Pb, ID-TIMS) are found in gneisses and migmatites of the Bogdoingol block. The tNd (DM-2st) values are 1.97 Ga in gneisses, while in quartz diorites tNd (DM-2st) = 2.0 Ga.
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