...M. F. Brigatti; E. Caprilli; D. Malferrari; A. Mottana Abstract This study focuses on the crystal-chemical characterization of fluorannite from the Katugin Ta-Nb deposit, Chitinskaya Oblast’, Kalar Range, Transbaikalia, eastern Siberia, Russia. The chemical formula of this mineral is (K 0.960 Na...

... ones and are still poorly studied. They are most abundant (igneous and sedimentary rocks) in the central part of the Udokan Ridge. Three large grabens exist there, two of which, Middle Kalar and Chitkanda, are filled with Jurassic and Cretaceous terrigenous-sedimentary carbonaceous deposits...

... Shield and its framing. In recent years, new data have been obtained on the wide age range of the regional ultramafic-mafic massifs: from Late Neoarchean and Proterozoic to Late Mesozoic and Cenozoic ( Buchko, 2010 ; Gongal’skii, 2012 ; Larin et al., 2006 ; Sal’nikova et al., 2004 ; Zorin et al...

.... The rocks of the complex make up the Primorsky and southern Baikal Ranges. The first granitic stage is characterized by protoclastic structures with an oriented phenocryst “flow,” suggesting that the granitoids crystallized during the rise of the melt. Ovoid structures are also connected with that process...

... is not rare for the south of Siberia. Close dates exist for some gabbro-dolerite dikes in the Sharyzhalgay uplift of the Siberian Craton basement ( Gladkochub et al., 2012 ). The same age range 1860–1880 Ma comprises the dates for the Chiney and Luktur massifs. This data agrees with time of formation of Kalar...

... generations of researchers of the 19–20th centuries in Baltoscandia, the northwestern margin of the East European Platform. On the Siberian Platform, compared with the Baltoscandian and other platform areas, it is possible to reconstruct the full range of paleogeographic environments and their faunal...

... 1–2 ), which have been studied quite thoroughly as they contain phosphates and bauxites. The basement is composed of different complexes in a wide age range — from Archean to Late Riphean — intricately combined in a cover-folded structure. Recent studies [ 5 ] yielded new factual material providing...

... The mining of primary diamond deposits and placers in the Siberian craton yields 99% of the overall diamond winning in Russia (Dobretsov and Pokhilenko, 2010 ). Diamonds from these deposits have been studied by a wide range of up-to-date methods (Logvinova et al., 2011 ; Skuzovatov et al., 2011...

... accepted division of the Archean and Paleoproterozoic is presented. Plot a is a histogram of distribution of zircon ages, with a curve of relative probability (solid line); b , distribution of Hf isotope data by ages; zircon from different cratons is shown by different colors; the range of juvenile ε Hf...

... composition of the magmatic cores covers a wide age range along the concordia (2446 ± 12–2555 ± 27 Ma). An interesting example is grain 1, whose age, according to three measurements, becomes older in passing from the core to the edge ( Fig. 9 , Table 2 ). This indicates the specific domain structure...

...; that is, the samples were lab-contaminated during their processing. Thus, integrated geochronological 40 Ar/ 39 Ar, Rb–Sr, and Sm–Nd studies date the Lukinda massif within 249 ± 14 to 251 ± 15 Ma. This range corresponds to the Late Permian– Early Triassic. In the geologic history of the southeastern margin...

... as a result of influence of the tectonic events in the Paleoasian ocean that occurred near the Barguzin terrane, situated east of the southern Akitkan belt. In the southeast of the craton, the Aldan and Stanovoi provinces are established, separated by the Kalar (Stanovoi) zone of overthrust [ 12...

.... Fig. 3. Distribution of microseisms on Baikal. Storm of 19–20 August 1967. a – Amplitudes; b–d – periods of microseisms. Seismic stations: 1 – Kabansk, 2 – Zakamensk, 3 – Uakit, 4 – Orlik, 5 – Sred. Kalar, 6 – Mondy, 7 – Chara, 8 – Barguzin, 9 – Nizhneangarsk, 10 – Turan, 11 – Nelyaty, 12 – Arshan...

..., East Sayan, and Baikalsky ridges bordering the Hovsgol and Baikal basins, the Synnyr and Delyun-Uran mountains making the northwestern and northern borders of the Upper Angara and Muya rift basins, and the Ulan-Burgassy, Barguzin, South Muya, Kalar, and Udokan ridges, a large arch-block complex along...

... are most often inclined and a few spectra are flat ( Fig. 3 ). The (La/Yb) N ratios are from 1.07 to 7.32. The Shamanka metamorphic basalt and gabbro are of E-MORB affinity. The ratios of 143 Nd/ 144 Nd are in the range 0.5128–0.5129 and 87 Sr/ 86 Sr are 0.7039–0.7059, which indicates enriched-mantle...

... River contain ostracods, cephalopods, bryozoans, and conodonts of a broad stratigraphic range, is directly related to the possible presence of the Baksanian Horizon near the Lena River ( Kanygin et al., 1989 , 2007 ; Krasnov et al., 1983 ) and correlation with the Bratsk Formation near the Angara...

... composition and in the renewal of the species composition. Fig. 3. Stratigraphic range of ostracods in the Eriekhe River basin and the stages of their development. The species typical for deposits of: 1 – the Elgenchag age; 2 – the Lachug age. The upper subformation at the bottom ( Figs. 1...

... compensated by clastic, chemogenic, and biogenic deposition and on subsequent terrain-forming processes. The distribution of these facies shows that the number of lakes and their sizes varied in a large range during Miocene–Quaternary time in response to geological, climatic, and other global or regional...

... gardens, affecting the lives of more than 500 000 people. Satellite image estimation shows the loss of Brahmaputra river bank erosion ranges from 72.5 km2 to 80 km2/year during 1997 to 2008 ( Phukan et al., 2012 ). The present study area covers the lower Brahmaputra valley of Assam, with special...

... of the Naminga Formation, and the limbs contain Early Proterozoic metasandstones of the Sakukan Formation. Fig. 1. Position of the Udokan ore field in geological structures of the Naminga ore region. 1 – deposits of the Vendian-Early Cambrian variegated terrigenous-carbonate formation of the Kalar...