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Geological structure, composition of ores and age of the Bamsk gold deposit, amur region, Russia

Journal of Geoscientific Research in Northeast Asia 2004年第2期7卷 173-180页

作者： Vitaly A. Stepanov amur Research Integrated Institute FEB RAS Blagoveschensk 675000 Russia

The Bamsk gold-ore deposit is located in the amur region, the Far East of Russia. It is confined to the Early Cretaceous volcanic-plutonic uplift of central type, located in the Stanov folded-clumpy Pre-Cambrian system. The deposit is presented by a series of gold-bearing quartz and carbonate-quartz vein-stringer zones. They are confined to the super-intrusive zone of the Nevachansk subvolcanic intrusion of sienite-porphyric composition. The mineralization is being controlled by zone of fractures developed in the autochthone of the Bamsk fault. Quartz, carbonates and sericite prevail in the composition of ores. The quantity of ore minerals doesn’t exceed 1%～5%. Pyrite, chalcopyrite, galena and native gold are widely spread. Sheelite, gold and silver tellurides, sulphobismuthites, acanthite, sphalerite and cinnabar are less developed. Four stages of mineralization have been distinguished. Gold-sulphide-sulphosalt ore with tellurides of gold and silver is productive for gold. The following set of elements is typomorphic for the ores of the deposit: Au, Ag, Cu, Bi, Mo, Pb and Sb(W1, Pb1, Mo)-Cu-(Ag, Bi, Sb, Mn, W2, Pb2)form the vertical series of zoning. Rocks, enclosing the mineralization are exposed to the processes of listvenitization-beresitization. The processes of gumbeization and argillization are less manifested. The age of the gold mineralization, determined by Rb-Sr method on ore-accompanying minerals, is 130.6 Ma.

关键词： Bamck gold deposit fault quartz veins amur region Russia

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Recent advances on study of hadrosaurid dinosaurs in Heilongjiang(amur) River area between China and Russia

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Global Geology 2011年第3期14卷 160-191页

作者： Pascal Godefroit Pascaline Lauters Jimmy Van Itterbeeck Yuri L. Bolotsky DONG Zhiming JIN Liyong WU Wenhao Ivan Y. Bolotsky HAI Shulin YU Tingxiang Royal Belgian Institute of Natural Sciences Department of Palaeontology B -I 000 Bruxelles Belgium Afdeling Historische Geologie Katholieke Universiteit Leuven B -3000 Leuven Belgium amur Natural History Museum Institute of Geology and Nature Exploration FEB RAS 675000 BlagoveschenskAmurskaya Oblast＇ Russia IVPP Beijing 100044 / Research Center of Paleontology and Stratigraphy Jilin University Changchun 130026 China Museum of Jilin University Changchun 130026 China Research Center for Paleontology and Stratigraphy Jilin University Changchun 130061 China The Geological Museum of Heilongjiang Harbin 150036 China

Four main dinosaur-bearing sites have been investigated in latest Cretaceous deposits from the amur/Heilongjiang region ： Jiayin and Wulaga in China （ Yuliangze Formation）, Blagoveschensk and Kundur in Russia （Udurchukan Formation）. More than 90% of the bones discovered in these localities belong to hollow-crested lambeosaurine hadrosaurids： Charonosaurus fiayinensis at Jiayin, amurosaurus riabinini at Blagoveschensk, Olorotitan arharensis at Kundur, and Sahaliyania elunchunorum at Wulaga. Flat-headed hadrosaurine hadrosaurids are much less numerous, but appear well diversified as well： Kerberosaurus manakini at Blagoveschensk, Wulagasaurus dongi at Wulaga, and a new genus at Kundur. Theropods are represented by shed teeth and isolated bones; isolated scutes and teeth discovered at Kundur are tentatively attributed to nodosaurids. Palynological studies suggest that these sites are probably synchronous with the Lancian＇ vertebrate localities of western North America, which represent the youngest dinosaur faunas in this area. However, the latest Cretaceous dinosaur assemblages are completely different in the amur/Heilongjiang region （lambeosaurines abundant, ceratopsids absent） and in western North America （ceratopsids abundant, lainbeosaurines extremely rare or absent）. This probably reflects some kind of geographical barrier between both areas by Maastrichtian time rather than strong differences in palaeoecological conditions.

关键词： Heilongjiang Province amur region Late Cretaceous dinosaurs Hadrosauridae palaeobiogeography

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