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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

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

gold-Platinoid Mineralization of Metasomatically Altered Ultramafites in Precambrian Protrusions of Mamynsky geoblok

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global geology 2003年第2期8卷 160-165页

作者： V.g.Khomich V.P.Molchanov N.g.boriskina geological Institute of the Far Eastern Branch Russian Academy of Sciences Vladivostok 690022 RussiaGeological Institute of the Far Eastern Branch Russian Academy of Sciences Vladivostok 690022 RussiaGeological Institute of the Far Eastern Branch Russian Academy of Sciences Vladivostok 690022 Russia

On the contiguous territories of Russia and China, along the left and right banks of the Amur River (Heilongjiang Province of China, and Amur Oblast’ of Russia), several Precambrian protrusions (gonzhinsk, Mamynsk, Amurkhe, and Khumakhe) are known. On the Russian territory, along the setting and on the area of the protrusions, lode manifestations, precious-metal deposits, and gold-platinoid placers are known having the industrial importance. Ultramafites are metasomatically altered more likely by the action of the Late Paleozoic intrusions and produced by them hydrothermae, and are transformed into listvenites. It can be concluded that as one of the sources of precious metals in the placers were the aureoles of listvenitization. This is evidenced by the presence of talc (typomorphic mineral of apoultrabasites) inclusions together with Pt-, Pd- and Ir-bearing gold in the corrosive coatings of the primary platinoids. This conclusion requires the revision of the work strategy of prospecting the lode gold and PgE manifestations within the ore-placer node because apoultrabasites before were considered non-promising for precious metals.

关键词： ultramafites, gold-platinoid, mineralization, Precambrian, AmurRiver

Deep-seated structure and gold content of Russia and China contiguous territories

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global geology 2010年第1期13卷 33-40页

作者： V.g. Khomich YANg Yanchen N.g. boriskina YAN Hongquan Far East geological Institute FEB of RAS Vladivostok 690022 Russia College of Earth Sciences Jilin University Changchun 130061 China

On the contiguous territories of southeastern Russia and northeastern China,many gold-bearing areas are conjugate in space with the gradient zones of the gravity *** gold-ore districts,defining in many respects the metallogenic signature of the region,are located on the joints of differently oriented gradient *** the best-studied districts,the Precambrian protrusions,staged distribution of magmatic chambers (by vertical) above the Mohorovicic discontinuity and restriction to the peripheral parts of intrusive massifs have been ***-type gold deposits in the studied ore-placer districts and nodes are often located on the areas of joint of the granitoid massifs and subvolcanic bodies with *** of areals of metasomatic alterations of rocks,placers,and ore occurrences of precious metals on such but poorly studied areas can serve as the basis for the revision and detailed forecasting-prospecting works to develop the mineral-raw material base of the region for precious metals.

关键词： gradient zone gravity field intrusive massif gold-bearing area gold content