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Barinov V. V. Myglan V. S. Taynik A. V. Oidupaa O. Ch. Agatova A. R. Churakova O. V. 《Izvestiya Atmospheric and Oceanic Physics》2018,54(10):1449-1459
Izvestiya, Atmospheric and Oceanic Physics - Analytic data on anomalies of the tree-ring structure of Siberian larch on the transect, passing through the Russian part of the Altai-Sayan Mountain... 相似文献
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A. N. Derkachev N. A. Nikolaeva A. V. Mozherovsky T. N. Grigor’eva E. D. Ivanova S. P. Pletnev N. N. Barinov V. M. Chubarov 《Russian Journal of Pacific Geology》2007,1(3):203-229
This paper reports specific mineralogical and geochemical characteristics of deposits from the local depressions of the Derugin Basin. They were formed in an environment with periodic changes from oxic to anoxic conditions and show evidence for the presence of hydrogen sulfide in bottom waters. The deposits of this type can be considered as a modern model for ancient ore-bearing black shale associations. Compared with typical metalliferous black shale sequences, which are characterized by high contents of organic matter, the sediments described here are depleted in the elements of the organophilic association (Mo, Ni, Cu, Zn, V, and U) but have higher Mn contents. 相似文献
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A. I. Khanchuk L. P. Plyusnina A. V. Ruslan G. G. Likhoidov N. N. Barinov 《Geology of Ore Deposits》2013,55(4):225-244
Elevated contents of noble metals (NM) have been established in the Riphean-Cambrian graphite-bearing complexes of the northern Khanka Terrane, which metamorphosed under conditions of greenschist to granulite facies. At the previously known graphite deposits of the Turgenevo-Tamga group, NM comprise (ppm): Pt (0.04–62.13), Au (0.021–26), Ag (0.56–4.41), Pd (0.003–5.67), Ru (0.007–0.2), Rh (0.001–0.74), Ir (0.002–0.55), and Os (0.011–0.09). Analyses of graphitized rocks carried out with various methods (IMS, INAA, AAS, AES, fire assay) reveal a wide scatter of the results related to the specifics of sample preparation, in particular, due to a significant loss of NM by thermal oxidation decomposition. Analysis of a low-soluble graphite residue obtained by treatment of graphitized rocks allowed us to establish genetic links between NM mineralization and carbonic alteration of various igneous, granulite- and amphibolitefacies metamorphic rocks, which occur over a vast area. The nonuniform distribution of graphite and NM in rocks, their fine dispersivity, and compositional variability of NM indicate that their origin is related largely to endogenic processes with the participation of deep reduced fluids. In greenschist-facies rocks, fluorine, bromine, and iodine are associated both with ore minerals and graphite, providing evidence for transport of NM by halogene- and carbon-bearing fluids. The inhomogeneous distribution of metals in graphite, microglobular structure, and carbon isotopic composition are the guides for its gas-condensate crystallization. At the same time, thermal analysis and Raman spectroscopy show that graphite formed by metamorphism of carbonaceous matter contained in sedimentary rocks also occurs. It is concluded that the predominant mass of NM is of fluid-magmatic origin with the participation of exogenic and metamorphic sources of metals. 相似文献
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A. I. Khanchuk L. P. Plyusnina E. M. Nikitenko T. V. Kuzmina N. N. Barinov 《Russian Journal of Pacific Geology》2011,5(2):89-96
The mineral and chemical composition of the carbon-bearing rocks of the Late Permian Pionerskaya Formation containing the
Degdekan gold deposit has been studied. The bulk contents of Au, Ag, Pt, and Pd in the black shales and their light, sulfide,
and electromagnetic fractions were determined by electrothermal atomization. The mineral composition and the phase analysis
of the rocks were studied using a scanning electron microscope. Gold is present as fine xenomorphic grains of high fineness
with an Fe admixture of up to 4 at %, as well as intergrowths of kustelite and electrum. The Au and Pt contents in the black
shales and ores vary in a wide range (g/t): Au 0.01–13.12, Pt 0.001–1.34. The highest Au contents (up to 1748 g/t) were noted
in the sulfide fraction. The Pt-bearing phases were not found, whereas a Pt content of about 0.61 wt % was determined using
an electron microscope in a carbonaceous matrix. The initial rocks have a steady and low Pt content (less than 0.007 g/t).
A stable even Au distribution in the studied rocks was established within 1.14–2.46 g/t. The chemical analysis of the soluble
fraction of the carbonaceous matter extracted from the black shales showed the presence of Au 0.375, Ag 3.68, Pt 0.147, and
Pd 0.052 g/t. It has been concluded that the carbon-bearing rocks of the Pionerskaya Formation play a resource role in the
accumulation of noble metals, whereas economic concentrations of the latters are formed in the course of the superimposed
metamorphic-hydrothermal processes. 相似文献
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Myagkova I. N. Shirokii V. R. Kalegaev V. V. Barinov O. G. Dolenko S. A. 《Geomagnetism and Aeronomy》2021,61(1):138-147
Geomagnetism and Aeronomy - The possible use of artificial neural networks—classical multilayer perceptrons—with coupling functions to forecast time series of the Dst geomagnetic index... 相似文献
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Markov Yu. D. Mozherovskii A. V. Derkachev A. N. Barinov N. N. Sereda N. A. 《Lithology and Mineral Resources》2002,37(2):121-129
Detailed mineralogical investigations of high-Fe layer silicates from loose sediments (glauconite sands) of the Sado Ridge revealed that green aggregates found on submarine rises of the Japan Sea floor have a different genesis. It was demonstrated that round dark green grains approximate micas in composition. Primary volcanic rocks presumably experienced extensive secondary alterations and then were disintegrated. Their disintegration products (protoceladonite) filling the pores were redeposited and buried in the sediment for a long time. Angular green grains, mainly represented by smectite, were also formed at lower temperatures during the disintegration of altered volcanosedimentary rocks. These younger grains did not experience prolonged exposure. Pseudomorphs of siliceous microplankton consist of both hydromica and smectites. They are presumably authigenic products formed with the participation of microorganisms or electrostatic processes (spherical shape), or their combination. The formation mechanism of minerals filling the cavities in pyroclastics is not entirely clear. 相似文献
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Rare-Earth Elements from Modern Mineral–Organic Associations in the Zone of Sulfide Ore Hypergenesis
The REE composition of modern mineral–organic associations in the sulfide ore hypergenesis zone of the Berezitovoe deposit in the Russian Far East was studied for the first time. It is shown that the mineral–organic associations widely abundant in the valley of Konstantinovskii Creek and represented by bright brown crusts on the surface of deluvial deposits were formed at the expense of the influence of acid highly mineralized mine waters from the Berezitovoe deposit. The mineral–organic associations found in the Creek valley may be considered as a new indicator for evaluation of the geoecological state of modern technogenic landscapes. 相似文献