...I.V. Gordienko; A.V. Filimonov; O.R. Minina; M.A. Gornova; A.Ya. Medvedev; V.S. Klimuk; A.L. Elbaev; O. Tomurtogoo Abstract We propose a model of the geodynamic evolution of the Dzhida island-arc system of the Paleoasian Ocean margin which records transformation of an oceanic basin...

... that the two formations were deposited in different basins and tectonic settings. The rock compositions and Nd isotope signatures suggest an island arc setting for the Shubutui deposition in the Dzhida terrane and a continental-margin setting for the deposition of the Kornilova Formation, which...

...; the Dzhida and Ol’khon fragments of island-arc system; the belt of layered subduction massifs of Northern Baikal and eastern frame of the Muya block; the Naran, Eastern Sangilen, Southern Khamar-Daban, Ol’khon, and Bodaibo fragments of sedimentary basin; the Dzavhan, Hovsgol-Bokson, Western Baikal...

... compositional fields of Cr-diopsides: A – associated with amphibole in xenoliths from alkali basalts of the Udokan Ridge and Dzhida River basin; B – of xenoliths from alkali basalts of the Udokan and Kamar Ridges and other areas of the Baikal region; C – of xenoliths with interstitial glass from alkali basalts...

... by the relationships between pre-Vendian and Vendian-Early Paleozoic layered tectonic complexes of the Khamar-Daban Ridge and Dzhida River basin, as well as by the nature of clastics among them. The existing hypotheses suppose that either these features are divided by a steeply dipping deep fault [ 1...

...Fig. 2. Geological framework of Dzhida–Khamar-Daban zone. 1 . Cenozoic deposits of Tunka rift basin. 2 . Cenozoic basalts. 3 . Mesozoic volcanosedimentary rocks. 4 . Late Paleozoic (298 Ma) granosyenite and syenite. 5 . Ordovician (478–495 Ma) granitoids. 6 . Ordovician diorite and gabbro...

... the Dzhida zone. 1 , 2 , clinopyroxenes from the Urgol ( 1 ) and Dzhidot ( 2 ) guyots. Fields of clinopyroxenes from basalts: MORB, OIB, Siberian Platform basalts (SPB), and Nauru Basin (Ontong Java Plateau) basalts (Nauru). Dashed lines mark the Urgol guyot, and the solid line, the Dzhidot guyot. Compiled...

... as a separate unit by Belichenko et al. [ 3 ], borders the Dzhida and Tunka terranes and the Siberian craton. The boundary with the Tunka terrane is buried under the Cenozoic Tunka basin fill, and thrusting of the Khamar-Daban complexes onto the Tunka terrane can be observed only in the west, in the North-East...

...V.A. Simonov; A.I. Al’mukhamedov; S.V. Kovyazin; A.Ya. Medvedev; Yu.V. Tikunov On the basis of new data on melt inclusions in clinopyroxenes, we have established the physicochemical conditions (magma compositions, temperature, and pressure) of formation of boninites in ophiolites of the Dzhida zone...

... stage, the active continental margin underwent backarc rifting and rifted off the Siberian craton whereby an elongate oceanic basin opened along the area from East Tuva to Dzhida (Transbaikalia), northern Mongolia, and on, possibly, as far as the Baikal-Muya belt in northern Transbaikalia. Fig. 3...

...Fig. 5. Model for the geodynamic evolution of the Dzhida island arc system in the Vendian–Early Paleozoic. 1 , oceanic crust of the PAO and backarc basin with spreading zones; 2 , continental crust of the Khamar-Daban microcontinent (KhD); 3 , magma and fluid flows in spreading zones...

... and harzburgites) were locally dragged out to the day surface along transform faults and existed as oceanic or volcanic islands washed later into beach serpentinite conglomerates. The absence of other rocks indicates that the Dzhida oceanic basin was originally wide and occurred far off continental margins...

.... The geodynamic evolution of the studied region in the Late Riphean – Early Paleozoic might be followed by the example of the well-studied Dzhida zone of Caledonides [ 11 , 12 ]. In the Late Riphean, at the place of the Dzhida zone in Southwestern Transbaikalia and Northern Mongolia, between the Tuva...

... (apparent) Rb-Sr ages of the hosted biotites also date them to the Mesozoic ( Table 1 ). Table 1 Composite Data on Isotope Ages of Paleozoic Granitoids of Selenga-Stanovoy Area in Transbaikalia Zone Objects of study Method of dating Age, Ma Ref. Dzhida zone Dzhida basin Granitoids...