... that crystallization differentiation of initial, more melanocratic melt with fractionation of hornblende and, to a lesser extent, plagioclase will be accompanied by a decrease in concentrations of HREE and Y. In contrast, the rocks of the Shumikha massif have elevated (compared with the Arzybei plagiogranites...

... of sedimentation, and provenances of metaterrigenous-carbonate complexes of the Derba block (Sayan Group), West Sangilen block of the Tuva–Mongolian massif (Erzin and Moren complexes), and the Khamar-Daban terrane (Slyudyanka Group) suggests that these structures were a single Vendian continental margin...

... stratigraphically from top to bottom. 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...

... data are not available: Dunzhugur (1050–850 Ma), Arzybei (1100–800 Ma), Shishkhidgol (820–775 Ma), Sarkhoi (805–770 Ma), Yenisei (697–637 Ma), Shumikha–Kirel (687 Ma) in East Sayan (Fedotova and Khain, 2002 ; Izokh et al., 2012 ; Kuzmichev, 2004 ; Kuzmichev and Larionov, 2011 , 2013 ; Turkina et...

... inliers (Angara–Kan and Sayan) Mesoproterozoic–Neoproterozoic marginal continental region that includes the Yenisei Ridge. the Precambrian terrane (Isakovka, Predivinsk, Arzybei, Shumikha-Kirel, etc.) made up of Neoproterozoic ophiolites and island-arc rocks ( Chernykh, 2001 ; Khain et al., 1993...

...; 11 , Early Proterozoic Tuksha migmatite–plagiogranite complex; 12 , Late Archean (probably Early and even Late Proterozoic) Kingash dunite–wehrlite–picrite complex of small layered differentiated massifs; 13 , Late Archean–Early Proterozoic(?) Idar dunite–harzburgite complex (stocks, dikes, lenses...

... domes. They are virtually not subjected to magmatic differentiation. Formation of granitoids of the Solzan massif and Sharanur complex lasted 26–28 Myr, which might be considered an indicator of collisional granitoid magmatism. Collisional granitoids of different provinces have a series of indicative...

... of the Il’chir and Bokson allochthon complexes, which contain olistostrome and mélange scales and are obducted onto a carbonate cover of the Gargan microcontinent. All plates converge in the headwaters of the Onot River, forming a self-contained plate—the Ospa basite–ultrabasite massif. It is believed...

...]tB (4); 5 — fore-arc and marginal basins; 6 — post-Cambrian rock complexes. Parenthesized is the age of rock complexes, Ma: Arz — Arzybei, G — Gargan, Khm — Khamar-Daban, B — Barguzin, Sr — Sarkhoi, Nyur — Nyurundukan, Kz — Kotlas in Kuznetsk Alatau; Oka — Oka Group, Dun — Dunzhugur ophiolites...

... — Middle Cambrian secondary quartzites (Shakhmatovo Formation); 5 — nepheline and alkali syenite-porphyries; 6 — gabbroids: a — medium-grained essexites, b — essexite-porphyries, c — trachydolerites; 7 — sampling locations; 8 — rock outcrops. In inset — location of the massif on tectonic...

... varieties with MgO > 24–25 wt.%, dunites, peridotites, or gabbroid and pyroxenite massifs do not occur among the igneous rocks of the Rybnaya–Panimba belt. Therefore, we have no reason to assign these rocks to ophiolites or fragments of their section ( Kheraskova, 1999 ). Meso- and Neoproterozoic...

... Geology and Geophysics (Geologiya i Geofizika) 48 ( 1 ), 71 – 82 (93–108). Dobretsov , N.L. , Shatsky , V.S. , 2004 . Exhumation of high-pressure rocks of the Kokchetav massif: facts and models . Lithos 78 , 307 – 318...