...A.D. Nozhkin; O.M. Turkina; N.V. Dmitrieva; A.V. Travin; I.I. Likhanov Abstract The Derba block is one of the largest Precambrian terranes of the Sayan–Yenisei accretionary belt in the southwestern margin of the Siberian Platform. It is composed of metamorphosed terrigenous-carbonate rocks...

... Precambrian terranes in the belt were originally correlated to Early Precambrian basement complexes of the Siberian craton and the terranes were described as its former fragments ( Polkanov and Obruchev, 1964 ). Later the Sangilen and Derba blocks were interpreted as microcontinents without Precambrian...

... , N.V. , Travin , A.V. , Likhanov , I.I. , 2018 . Metacarbonate-terrigenous complex of the Derba block (East Sayan): petrogeochemical and isotope parameters, metamorphism, and time of formation . Russ. Geol. Geophys. 59 ( 6 ), 652 – 672 , doi: 10.1016/j.rgg.2018.05.005...

..., may refer to the earliest evolution stage of the Olkhon metamorphic terrane. New data for the Olkhon terrane agree well with the ages of other high-grade complexes along the southern Siberian craton (Slyudyanka, Kitoikin, Derba) and correspond to the initiation of the Central Asian orogen...

...Fig. 1. Location of key sections of Neoproterozoic deposits in the structure of the Altai-Sayan Folded Area (after [ 66 ]; simplified). 1 — Siberian Platform; 2 — microcontinents and their blocks: D — Derba, K-A — Kan-Arzybei, Sh — Shutkhulai, G — Gargan, Kh — Khamar-Daban, S — Sangilen, K...

... along the southern craton margin, and includes (from east to west) the Olkhon, Slyudianka, Kitoykin and Derba terranes ( Fig. 1 ). These terranes are separated from the Siberian craton by the Primorsky and Main Sayan faults. Records of terrane accretion and collision, as well as the geological histories...

... complexes; 4 , Vendian metaterrigenous-carbonate complexes of the Derba microcontinent and the Kitoikina zone; 5 , Paleoproterozoic continental marginal complexes of the Angara fold belt (AFB): metasedimentary ( a ), metavolcanosedimentary ( b ); 6 , Paleoproterozoic granitoid complexes of the Angara...

... in Kokchetav block (540–517) Various tectonic structures emerged and disappeared within the limits of the ocean in the course of its history: island arcs upon continental or oceanic crust, oceanic islands (seamounts and guyots) and rift valleys with different spreading rates, fringing and inland seas...

... obtained from the Mana trough [ 81 , 82 ], contradict this concept. They indicate that the Late Precambrian—Cambrian rocks occurring there on oceanic crust form a block sandwiched between the Kan and Derba microcontinents ( Fig. 3 ). At its northeastern side, we found stratigraphic contacts between...

...N.I. Volkova; E.V. Sklyarov Abstract Blueschists are constituents of subduction-accretion complexes, where they occur either as separate tectonic slabs, slices, and lenses, or as exotic blocks in a melange. Often associated with ophiolites, blueschists are commonly metamorphosed members...