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The Berezitovoe gold-polymetallic deposit(Upper Amur region,Russia)：Structure,mineralogy and genetic aspects

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Geoscience Frontiers 2016年第3期7卷 483-494页

作者： Alexandr S. Vakh Vadim G. khomich Natalia G. Boriskina M. Santosh far East Geological Institute Far East Branch of Russian Academy of Sciences 159 Prospect 100 let Vladivastoku Vladivostok 690022 Russia School of Engineering Far Eastern Federal University 8 Suhanova St. Vladivostok 690950 Russia Department of Earth Sciences University of Adelaide SA 5005 Australia School of Earth Sciences and Resources China University of Geosciences Beijing 29 Xueyuan Road Beijing 100083 China

The Berezitovoe deposit in the Sergachi volcano-plutonic and metallogenic belt preserves evidence for polymetallic mineralization of multiple *** steeply dipping gamet-tourmaline-muscovite-quartz metasomatites（with K-Ar ages of 132 ± 2.9 and 127 ± 4.4 Ma） carry two distinct stages of mineralization developed at different times：（1） polymetallic mineralization and（2） *** deposit is located within Paleozoic gneissose granitoids of the Pikansky complex（dated as 379 ± 1.1 Ma by zircon U-Pb method） intruded by early Cretaceous porphyry-like granites of the Haikta pluton（dated as137 ± 0.67 Ma by zircon U-Pb method） and late Cretaceous dikes of porphyrites,porphyries,and *** suggests the action of late gold-bearing hydrothermal fluids on the early polymetallic ores and the selective mobilization of some elements from these lead to redeposition together with complex sulphosalts.

关键词： Amur River head Gold Early Cretaceous Metallogeny Tectonics

Chronology and Geochemistry of the Berezitovoe Polymetallic Gold Deposit in Eastern Siberia, Russia and its Geological Significance

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Acta Geologica Sinica(English Edition) 2017年第5期91卷 1733-1750页

作者： ZHANG Guobin YANG Yanchen Alexander S.VAKH Vadim G. khomich WANG Keyong YE Songqing HAN Shijiong Department of Geology Liaoning Technical University College of Earth Sciences Jilin University Far East Geological Institute Far East Branch Russian Academy of Sciences

The Berezitovoe deposit is a large-sized Au-Ag-Zn-Pb deposit in the east of the SelengaStanovoi superterrane, Russia. Au-Ag orebodies are hosted by tourmaline-garnet-quartz-muscovite metasomatic rocks; Zn-Pb orebodies are hosted by granodiorites, porphyritic granites and tourmalinegarnet-quartz-muscovite metasomatic rocks. These orebodies are surrounded by wall rocks dominated by the Tukuringra Complex granodiorites, porphyritic granites, and gneissic granodiorites. The alteration includes silicification and garnet, sericitization chloritization, carbonatization and kaollinization. LA-ICP-MS U-Pb zircon dating indicates that the gold mineralization can be divided into two stages in the Berezitovoe polymetallic gold deposit（at 363.5 ± 1.5 Ma, and133.4± 0.5）.Hornblende-plagioclase gneisses of the Mogocha Group in the study area underwent Paleoproterozoic metamorphism（at 1870 ± 7.8 and 2400 ± 13 Ma）, gneissic granodiorite of the Tukuringra Complex yields a late Paleozoic magmatic age（at 379.2 ± 1.1 Ma）,and subalkaline porphyritic granitoid of the Amudzhikan Complex yield late Mesozoic magmatic ages（133-139 and 150-163 Ma）. Granodiorites of the Tukuringra Complex in the study area have high concentrations of SiO_2（average of 60.9 wt%）, are aluminum-oversaturated（average A/CNK of 1.49）, are enriched in the large ion lithophile elements（e.g.,K, Rb, and Ba）, U, Th, and Pb, are depleted in high field strength elements（e.g., Ta, Nb, and Ti）, and have slightly negative Eu and no Ce anomalies in chondrite-normalized rare earth element *** inclusions from quartz veins include three types： aqueous two-phase, CO2-bearing three-phase,and pure CO2. Aqueous two-phase inclusions homogenize at 167℃-249℃ and have salinities of 4.32%-9.47% NaCl equivalent, densities of 0.86-0.95 g/cm^3, and formed at depths of 0.52-0.94 km. In comparison, the CO2-bearing three-phase inclusions have homogenization temperatures of 265℃-346℃,salinities of 7.14%-11.57% NaCl equivalent, and total

关键词： Geochemistry U-Pb zircon dating fluid inclusions Berezitovoe polymetallic gold deposit Eastern Siberia Russia

Growth of 4＂ diameter polycrystailine diamond wafers with high thermal conductivity by 915 MHz microwave plasma chemical vapor deposition

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Plasma Science and Technology 2017年第3期19卷 93-97页

作者： A F POPOVICH V G RALCHENKO V K BALLA A K MALLIK a a khomich A P BOLSHAKOV D N SOVYK E E ASHKINAZI V Yu YUROV Institute of Radio Engineering and Electronics of Russian Academy of Sciences Fryazino 141190 Russia General Physics Institute of Russian Academy of Sciences Moscow 119991 Russia Harbin Institute of Technology Harbin 150001 People's Republic of China National Research Nuclear University MEPhI Moscow 115409 Russia Central Glass and Ceramic Research Institute Kolkata 700 032 India

Polycrystalline diamond（PCD） films 100 mm in diameter are grown by 915 MHz microwave plasma chemical vapor deposition（MPCVD） at different process parameters,and their thermal conductivity（TC） is evaluated by a laser flash technique（LFT） in the temperature range of230-380 *** phase purity and quality of the films are assessed by micro-Raman spectroscopy based on the diamond Raman peak width and the amorphous carbon（a-C） presence in the *** and increasing dependencies for TC with temperature are found for high and low quality samples,***,as high as 1950 ± 230 W m-1 K-1 at room temperature,is measured for the most perfect material.A linear correlation between the TC at room temperature and the fraction of the diamond component in the Raman spectrum for the films is established.

关键词： thermal conductivity polycrystalline diamond microwave plasma chemical vapordeposition Raman spectroscopy

Ore-placer shows of platinum group elements in the areal of North-Asian Superplume derivations(South-East Russia)

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Global Geology 2011年第4期14卷 209-220页

作者： Vadim G.khomich Natalya G.Boriskina Far East Geological Institute of FEB of RAS Vladivostok 690022Russia

The sources of large and unique platinum-metal placers were the zonal alkali-ultrabasic massifs be- coming active in the Cretaceous time that gravitated to the periphery of the areal of the North-Asian Superplume （NAS） influence. Origin of the conditions favorable for the formation of the placer platinum presence in the re- gion is governed by the plume ore-generating magmatism of several generations （ in Proterozoie and Phanerozo- ic）. Ultramafite-mafite magmatism was responsible for the origin of the stratified zonal massifs subjected in the Late Paleozoic and Mesozoic to the action of granitogene derivations of the NAS. The latter provided the devel- opment of the ore-forming magmagene-fluid-metasomatic processes and favorable conditions for the platinum group elements concentration.

关键词： platinum-bearing ore-placer South-East Russia

甲烷浓度对CVD金刚石薄膜晶体学生长过程的影响

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无机材料学报 2007年第3期22卷 570-576页

作者：朱宏喜毛卫民冯惠平吕反修 Vlasov I I Ralchenko V G khomich A V 北京科技大学材料学系 General Physics Institute Russia Academy of SciencesMoscow 119991 Russia Institute of Radio Engineering & Electronics Russia Academy of SciencesFryazino 141190 Russia

采用X射线衍射技术、电子背散射衍射技术和扫描电镜分别观察了不同甲烷浓度条件下沉积的CVD自支撑金刚石薄膜的宏观织构、微区晶界分布和表面形貌．研究了金刚石晶体{100}面和{111}面生长的晶体学过程．研究表明,{100}面通过吸附活性基... 详细信息

采用X射线衍射技术、电子背散射衍射技术和扫描电镜分别观察了不同甲烷浓度条件下沉积的CVD自支撑金刚石薄膜的宏观织构、微区晶界分布和表面形貌．研究了金刚石晶体{100}面和{111}面生长的晶体学过程．研究表明,{100}面通过吸附活性基团CH2 2-,而{111}面通过交替吸附活性基团CH3 -和CH3-后脱氢堆积碳原子．低甲烷浓度时,{111}面表面能低于{100}面,使{111}面生长略快于{100}面．甲烷浓度升高,动力学作用增强使{100}面生长明显快于{111}面,使金刚石薄膜产生{100}纤维织构;同时显露的{100}面平行于薄膜表面,竞争生长使位于晶体侧面的{111}面由于相互覆盖而减小,形成了不同于单晶体自由生长的薄膜表面形貌组织．

关键词：金刚石薄膜织构晶体生长表面形貌组织

Gold and tin of fluid-magmatic systems:causes of combination-separation of concentration elements

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Global Geology 2009年第3期12卷 134-144页

作者： I.I. Fatyanov V.G. khomich Far East Geological Institute Far Eastern Branch of Russian Academy of Sciences

The aim of the investigation is to reveal possible causes of isolation and co-occurrence of the economically significant concentrations of gold and tin. Comparative analysis of the different-rank factors that influenced migration and concentration of these elements show that different geochemical properties of Au and Sn are responsible for isolation of their big concentrations giving rise to independent metallogenic provinces, zones, and ore nodes. These differences resulted in individualization of the element migration ways to the level of ore concentration within the fluid-magmatie columns. Three main factors influenced the Au and Sn migration activity： different patterns of metal connection with the meh structure, different relation with oxygen, and different relation with other strong oxidizers. By the moment when ore-bearing fluid became isolated from magmas, the metallogenic signature of the melts, contrasting in redox-potential, had already been defined that was confirmed by the fact that tin ores associate predominantly with the granitoids of ilmenite series and gold ores - with those of magnetite series. The fluid-magmatic systems with an intermediate degree of the melt reduction-oxidation may be considered the potential producers of the combined metal concentrations. In these cases, the combined con- centrating of tin and gold is plagued by an opposite direction of the oxidation-reduction reactions when their most common minerals are formed： the main migration form of Sn^＋2 must be oxidized （with cassiterite portioning） , and the forms of Au^＋ or Au^＋3 must be reduced （with native gold portioning）. Probably, because of this the combined tin and gold concentrations are dominated by one of the metals with a tendency of accumulation in different-stage mineral complexes.

关键词： gold tin migration concentrating fluid-magmatic systems redox-potential

Deep-seated geodynamics and position of Platinum-bearing basite-ultrabasite massifs of southeast Russia

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Global Geology 2012年第3期15卷 204-209页

作者： khomich V.G. Boriskina N.G. Far East Geological Institute of FEB of Russian Academy of Sciences

In the southeast part of the North-Asian craton, several ring basite-uhrabasite plutons have been rec- ognized, with which the commercial placers of platinoids associate. Analysis of the known geodynamic models of the region formation and materials of seismic tomography showed that the subduction processes, that actively manifested themselves in the Asia-Pacific convergence zone in Mesozoic, were responsible for initiation of the stagnated oceanic slab. Its NE and SW boundaries appear to coincide with the transform faults. Projection of the transform fault, bordering the above mentioned slab in the NEN, coincides with the Konder-Feklistovsky metal- logenic belt distinguished earlier and its Aldan （Inaglinsky） member. Higher platinum content of ring massifs of the belt is controlled by the influence of the lower mantle derivatives on the ascending upper mantle plumes.

关键词： southeast Russia mantle plumes Platinum-bearing ring massifs

Deep Metallogenic Speciality of Lithosphere in Amur Province, Russia

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Global Geology 2003年第2期8卷 166-174页

作者： A.M.Petryshchevsky V.G.khomich N.G.Boriskina Regional Problem Institute of Complex Analysis FEB RAS Birobidzan 679016 RussiaRegional Problem Institute of Complex Analysis FEB RAS Birobidzan 679016 RussiaGeological Institute of FEB RAS Vladivostok 690022 Russia

The spatial connections of endogenous deposits with anomalies of the vertical density gradient in lithosphere, calculated on the formulas for the spherical gravity sources are analyzed for Amur Province. The spatial parameters of tin-bearing, tungsten-bearing and gold-bearing regional ore-magmatic systems (ore regions, belts, zones and areas) are characterized by correlation of deep gradient density anomalies in the crust and upper mantle with the extensivity of superficial ore mineralization. Tin-ore deposits are mainly connected with density heterogeneities of the upper crust layer (up to a depth of 20 km), and tungsten, molibdenium and polymetallic deposits-with anomalies of the density gradient in the low crust layer (at a depth of 30 km) and in the upper mantle (at a depth of 60～70 km). Gold-ore regions are characterized by the greatest vertical range of fluid-magmatic systems (about 100 km from the surface) and arethrough ones in relation to mantle and crust tectonic structures. Opportunity is shown for the 3D density gradient model of the Amur Province lithosphere to be applied for constructing the forecast metallogenic models.

关键词： spatial parameters, Tin-bearing, 3D density gradient model, lithosphere, Amur Province, heterogeneitic

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CVD金刚石薄膜孪晶形成的原子机理分析

物理学报 2007年第7期56卷 4049-4055页

作者：朱宏喜毛卫民冯惠平吕反修 I.I.Vlasov V.G.Ralchenko A.V.khomich 北京科技大学材料学系北京100083 General Physics Institute Russia Academy of Sciences Institute of Radio Engineering & Electronics Russia Academy of Sciences

采用X射线衍射技术、电子背散射衍射技术和扫描电镜分别观察了不同甲烷浓度条件下沉积的CVD自支撑金刚石薄膜的宏观织构、晶界分布和表面形貌.研究了一阶孪晶在金刚石晶体{111}面生长的原子堆垛过程.结果表明,由于一阶孪晶〈111〉60°... 详细信息

采用X射线衍射技术、电子背散射衍射技术和扫描电镜分别观察了不同甲烷浓度条件下沉积的CVD自支撑金刚石薄膜的宏观织构、晶界分布和表面形貌.研究了一阶孪晶在金刚石晶体{111}面生长的原子堆垛过程.结果表明,由于一阶孪晶〈111〉60°的取向差关系以及{111}面的原子堆垛结构,使{111}面上容易借助碳原子的偏转沉积产生一阶孪晶.低甲烷浓度时,碳原子倾向于在表面能较低的{111}面沉积,为孪晶的形成提供了便利,且高频率孪晶使薄膜织构强度减弱.甲烷浓度升高使生长激活能较小的{001}面成为主要前沿生长面,因而只有〈001〉晶向平行薄膜法向的晶粒能够不断长大,因此孪晶形核概率明显减小.另外,在薄膜中发现二阶孪晶,并对二阶孪晶的形成进行了分析.

关键词：金刚石薄膜孪晶原子机理取向差