... zone (WS) are presented, which confirm the existence of Carboniferous (360–290 Ma) magmatic stage not only in the west but also in the center of the WS and refine the age of Early Paleozoic batholiths of the Olekma complex (480–430 Ma). This indicates that they are coeval with batholiths of the Malkhan...

...); 3–8 metaorthorocks of Malkhan Lower Proterozoic complex, PZ 1 m: 3 – basic metagabbroids, 4 – less basic metagabbroids, metadiorites, 5 – quartz metadiorites, 6 – ultrametamorphic biotite leicogranites, 7 – amphibole-biotite granites (gneissic granites), 8 – biotite gneissic granites, aplite-like...

...Fig. 2. Top-view geology of the stratotype section of the Kataevo Formation along the A–B line. 1 – Quaternary deposits; 2 – Bichur complex granitoids; 3 – Malkhan complex gneissose granitoids; 4 – Sharagol complex gabbroids; 5–8 –– Kataevo Formation: 5 – metabasalt, metaandesibasalt...

... is hosted by Early Paleozoic orthogneisses of the Malkhan complex dominated by metadiorites. The measured 40 Ar/ 39 Ar ages of granites and pegmatites are 127–123 Ma ( Zagorsky & Peretyazhko, 2010 ). Detailed descriptions of the geological setting, composition and inner structure of the Malkhan gem...

...; Permian deposits: 4 , 5 , Bichurin gabbro–monzonite–granite complex; 6 , Carbonaceous deposits, Daurian granodiorite complex; Paleozoic deposits: 7 , Malkhan granite complex; 8 , Dzhida diorite– granite–plagiogranite complex; 9 , Ulan-Burga metamorphic complex; 10 , Monostoi gabbro complex; 11...

...V.Ye. Zagorsky Abstract A detailed study was given to the composition and structure of alkali feldspars from the pockets of the Sosedka pegmatite vein, a large source of gems within the Malkhan tourmaline deposit. The vein is of concentric-zonal structure. Three types of pockets were recognized...

...-stage pocket mineral in the Sosedka and Mokhovaya pegmatite veins, Malkhan gem tourmaline deposit, Chikoy district, Chita oblast, Russia. Borocookeite proper, as well as boron-rich cookeite, is light grey with a pinkish or yellow hue and occurs as a dense, massive crypto-flaky aggregate or thin crusts...

... (Malkhan in Siberia), Mozambique (Muva) and the United States (Himalaya mine, California), and have determined the chemical composition of yellow tourmaline from those mines, as well as the compositions of similar material from Nepal (Sankhuwa Sabha District) and the Democratic Republic of the Congo...