Carried out investigations of geological structure and material composition of the Siberian platform kim- berlites indicated complexity and diversity of geologic-tectonic and paleogeographical situations, which should be considered when performing forecast-prospecting works on diamonds in each specific region. De- pending on geologic-geophysical and geomorphological situation of kimberlite diatremes’ occurrence specif- ic features of their forecasting and prospecting are determined. Knowledge of material composition of both sought-for diatremes and hosting and overlapping them sedimentary and magmatic formations is an im- portant criterion for prospecting of kimberlite bodies in various geologic-tectonic conditions. Special atten- tion should be paid to typomorphic specific features of both initial and newly formed minerals in diatremes.

Since 2002 on a diamond field of the Nyurbinskaya pipe of the Yakut Diamondiferous Province (YDP) pet- ro- and paleomagneticc studies of kimberlites of the Nakynsky intrusive complex (iD3–C1nk), accomodating them terrigenous and carbonate formations of Morkokinskaya suite of the Late Cambrian (Є3mrk), etc. have been conducted. As a result we received: a wide range of petrophysical parameters, information about a sur- face morphology and data on element chemical composition of ferromagnetic minerals, paleomagnetic direc- tions of avtolitic kimberlite breccia (AKB) etc. Essential changes of values of petromagnetic parameters of AKB with the depth is not found that witnesses a weak hydrothermal touch by the late magmatic processes. The main carriers of the natural remanent magnetization (NRM) of AKB are pyrrhotine (Tk≈325 °C) and magnetite (Tk≈578 °C) with which the characteristic components, respectively P and M are connected. The first «pyrrhotine» component takes place only in kimberlites while the second «magnetite» – in kimberlites and containing them Late Cambrian formations, and in the last ones it is metachronic. Besides in terrigenous and carbonate formations "hematite" component of NRM – C3 (Tk≈675 °C) is established which is well co- ordinated with paleomagnetic data on the Verkholenskaya suite of the Late Cambrian (Є3vl) studied in the south of the Siberian platform. The interpretation of the characteristic components assumes that component M is primary (synchronous to formation of an explosion tube) in the kimberlites, and component P – second- ary, formed due to «warming up» by post-pipe dike of alkaline dolerites. Paleomagnetic dating of component M confirms that intrusion of kimberlites took place a little later than formation of subalkaline dolerites dikes, and, generally, time of manifestation of these magmatic processes coincides with Late Silurian - Early Devo- nian (S2–D1) period. Secondary component P age is most likely Late Devonian – Early Carboniferous (D3– C1).

Generalization of the results of studies of mineralogical-geochemical features of placer gold and regularities of its distribution in alluvium of sedimentary cover allowed us to define prospects of gold content of the eastern Sibe- rian platform on a new level of knowledge. Since placer gold content does not represent commercial interest, it can be considered just as an object of integrated development of extraction of diamond, gold, platinum and other mineral resources. Thesis on gold-bearing conglomerates of Witwatersrand type, buried in deep horizons of sedi- mentary cover of the east of ancient platform, is problematic, and actually unrealistic as long as Precambrian sub- strate of the Yakutian arched uplift and other areas of the study region do not record positive geologic background for the formation of deposits of such type. Comparison of typomorphic features of placer gold and regularities of its distribution within a number of ancient platforms, allowed us for the first time to forecast the formation in this region of primary sources of Precambrian deposits of Porcupine and Kirkland Lake type and also Meso-Cenozoic deposits of Carlin and Cripple Creek type, known within the North-American platform.

Within the southern part of Urinsky anticlinorium the stratigraphic sections, presented by outcrops of sedi- mentary rocks of the Upper Riphean, Vendian and Lower Cambrian on the left bank of the river Lena between the mouths of creeks Terbyas and Trehverstny, 4.5 km above the village Nohtuysk, form a unique, well-studied geological entity called Nohtuyskiy reference section. Uniqueness of the section is in the fact that a number of stratigraphic units of the Upper Riphean, Vendian and Lower Cambrian are fully exposed and easily accessible for study. In this report the results of detection of trace elements concentration level and of the presence of ore and accessory mineralization in rocks of the described section are given. The study has shown ore mineraliza- tion, representing the greatest practical interest, made by chalcopyrite, Ni-containing pyrite, galena, bismite and native silver. Accessory minerals are represented by baddeleyite, zircon, zirconolite, apatite, ilmenite and Mn-ilmenite, hematite, a rare mineral - bismoсlite. Few significant concentrations of gold in limestone (up to 4.47 g / t) and altered carbonate-sulphide-Fe-oxide ores (2.25 g / t) are revealed. Concentration of ore genetic elements is higher in dolerite. The ores belong to Cu-Fe-Ni mineralogical and geochemical type.

Retrospection and evolution of ore-placer gold content of known Badran mine, located in Oymyakon region of the Eastern Yakutia are analyzed for a century. Placers with extraordinary heavy concentrated min- eral content were mined long before discovery of the deposit. Then, after several vain forecasts, Nadvigovaya zone with lenticular veins of mesothermal quartz was commercially evaluated. Revision provides a reason to believe that, high-grade ores of the deposit were regenerated due to overlay of Au-Ag mineralization. Speci- ficity and perspective of the eroded primary sources are identified according to detailed study of heavy concentrate sampling on water courses of the Badran ore-placer cluster. Mineral composition of alluvium consists of significant amount of brown ore (10-50%) and magnetite (up to 10%); scheelite, ilmenite, zircon, ru- tile, arsenopyrite, anatase, apatite, barite, garnet, hematite, leucoxene, muscovite, pyrite, sphene, tourmaline, chalcopyrite and spinel are represented by single grains. Besides, crystals and spheroids of electrum also occur, as well as fine native gold of higher fineness. It is noteworthy that barite and iron-containing minerals are present, representing consistent sequence of transformation and decomposition of pyrite during redox reactions. Processes of hypogene oxidation and decomposition of minerals by late epithermal solutions were repeated. Future of the Badran mine is seen in reassessment of structural-substantial features and construc- tion of geologic-genetic (positional) model of the deposit, considered as a standard of regenerated epithermal mineralization of Au and Ag.

Petrography, mineralogy and chemistry of rare-metal microcline-albite granites of the Kester har- polith, intruding granites of the Arga-Ynnakh massif of the Adychan anticlinorium of the Verkhoyansk continental margin are described in the article. It shows that, particularity of their composition is not comparable to the particularity of host granites and cannot be due to metasomatic change of the lat- ter. They are characterized by magmatic structures, mica lithium composition, rich accessory frac- tions, containing cassiterite, spodumene, lithium phosphates, columbite-tantalite etc., and represent derivatives of fluid-saturated magmatic melt. They are very different from host graniroids by high con- tents of rare metals and evolution on high phosphorous trend. Rb-Sr isotopic analysis indicates a crust nature of protolith. At the same time, the presence of magnesian pyroxene, high chromic magnetite, zircons of “D” and “E” morphotypes in rocks suggests that, crust magma forming substrate contains horizons of basic rocks, and that fluids related to high alkali basic melts supply the zone of magma generation.

The article discusses structural features of the Tyugeninsky field of volcanic rocks on the Lena-Viluy wa- tershed, which is located close to a major highway (fig. 1) and available for scientific study. There are two types of volcanic units. An andesitic type is presented by a pyroclastic volcanic cone and annular ramparts around it. A dacite type is presented by a volcanic cone and several lava flows. The placement of the igneous rocks is controlled by left shift faults kinematics. A positive correlation between increased gold content and relatively high K2O presence in volcanic rocks of different basicity of Tyugeninsky area is identified. General metallogenic specialization of the lavas belongs to Au-Cu type.

A brief information on the territories of Western Yakutia with discovered and projected oil bearing of sed- imentary cover is presented. New scientific approaches to the prediction of oil-bearing of sedimentary cover of the East of Siberian platform are proposed. Some new ideas about areas of oil and gas concentration of the newly formed type are developed. Their selection is reasonable in geological conditions, where, along with other favorable indicators of potential oil and gas content, numerous shows of oil and gas are discov- ered indicating active migration processes and concentration of hydrocarbons at the present stage of geolog- ical development of certain territories. It is substantiated a possibility of discovering in the next few years, new oil fields in the central regions of Yakutia with projected total geological oil resources more than 1 bil- lion tonnes. Recommendations are given on the priority of oil exploration activities in West Botuoba, South Vilyui and Aldan-Maya areas in connection with the implementation of major oil and gas mega-projects in the east of the Russian Federation and the large-scale oil supply for export through the pipeline system East- ern Siberia–Pacific ocean to the Asia-Pacific region. Taking into account the current state of geological and geophysical knowledge of each of the areas the priorities and the sequence of their study are substantiated.

A snow cover within the Elkon uranium ore district located in South Yakutia is investigated. By landscape and climate relation it is a mid-taiga subzone permafrost boreal region of Eastern Siberia. The study of the environment in the mining district has mastered the important ecological value. It was found that the chemi- cal composition of the investigated types of snow mountain landscape is hydro-calcium with low sulfate con- tent. The dominant influence on the formation of the chemical composition of snow cover have salts of conti- nental origin, mainly carbon compounds. The total density of the receipt of soluble and insoluble forms of the components in the snowpack increases regularly with changes in altitude - in the transition from mountain taiga to mountain-tundra territories. There is a significant prevalence of receipt with snow cover forms of soluble components in the landscape. Distribution of trace elements in the snowpack is not subject to high- altitude zoning. The maximum content of F, Sr, and heavy metals (Mn, Cu) in snow cover is observed in the landscapes of mountain tundra and due to positive vertical gradient of water stock in the snow and located in landscapes of mountain woodlands and mountain tundra ore bodies and endogenous halos of hydrothermal Au-U deposits.

In Yakutia, designers must cope with many geotechnical problems associated with complicated permafrost conditions. In order to design stable profiles for reclamation earthen canals with consideration for hydrolog- ical, hydrogeological, geocryological and hydraulic factors, special in-depth studies are required to under- stand the processes occurring in foundation soils during canal construction and operation. This explains the lack of regional design, construction and operation codes for earthen canals, i.e. the absence of a legislative basis for designing. The present study covers some of the geocryological aspects of earthen canal perfor- mance. The paper discusses the geocryological features of open earthen canals used for land reclamation in different permafrost-soil conditions of the cryolithozone of Yakutia. It presents the results of field investiga- tions on thermal and mechanical interaction of the water flow in canals and provides recommendations for designing a stable cross-section.

Regular observations of the hydroxyl emission band (6,2) were carried out at the Maimaga station (63°N, 129,5°E) since 1999. Measurements were conducted with an infrared spectrograph. The monthly average residuals of OH(6,2) temperature after the subtraction of the mean seasonal variation were studied earlier. The residual temperature maximum follow peak of Ottawa 10.7 cm flux with 25 months delay was found. The effect of geomagnetic activity on the subauroral mesopause temperature was evaluated to find the possible reasons for the time lag. The rotational temperature data set comprises 2229 nightly averages which pass selection criteria. For the analysis was used Ap index, which is indirectly dependent on the characteristics of the solar wind. The cross-correlation analyses showed connection between ОН(6,2) rotational temperature with the geomagnetic activity. The correlation coefficient R = 0.44 with a number of measures n=130. It can be concluded that the correlation between monthly average residuals of OH(6,2) temperature and monthly average of Ap index is significant for period from 1999 to 2013.

Abnormal blood and tissues GGT (very high or low activity) may be effective marker in diagnostic and prognostic problems, for example collagen diseases which connected with the deregulations (destruction, dysplasia) of connective tissues. Perceptiveness of the pathogenetics mechanisms studies of specific phenom- enon as syntropic diseases complex with participating of GGT is emphasized. New mechanisms of some non-Abnormal blood and tissues GGT (very high or low activity) may be effective marker in diagnostic and prognostic problems, for example collagen diseases which connected with the deregulations (destruction, dysplasia) of connective tissues. Perceptiveness of the pathogenetics mechanisms studies of specific phenom- enon as syntropic diseases complex with participating of GGT is emphasized. New mechanisms of some non-

The article discribes the influence of various pre-exposure treatment of onion seeds on physiological and biochemical indicators of its seedlings. It was revealed that pre-sowing onion seeds combined magnetic field (B=50µT) causes negative geotropism in seedlings. The length of the seedlings’ root significantly reduced relative to the control value after treatment with the magnetic field with the different exposures. The impact of magnetic field on onion seeds caused highly decrease in peroxidase activity and the content of low molecular weight antioxidants, with increased lipid peroxidation of its seedlings. The parameters of the magnetic field change the content of photosynthetic pigments in seedlings of Allium fistulosium L.

Thirteen steppe sites have been studied in the Yana and Indigirka Rivers basins for Orthoptera fauna. Six insect species from two families of Orthoptera were revealed to inhabit the steppes of Northeast Yakutia. The analysis of species biotopic distribution has shown only Gampsocleis sedakovii sedakovii and Bryodemella tuberculata to be strictly confined to steppe biotopes under the conditions of Northeast Yakutia. The conduct- ed study has proved a distinct structure, phenology and dominant species composition of Orthoptera commu- nities inhabiting the relict steppes of Northeast Yakutia. This allows to make them into two separate types.

The paper contains data on distribution of 28 species from 5 families of sawflies in the territory of the Ya- kut Botanical Garden. Six species (Cimbex femoratus L., Pristiphora geniculata Htg, Dolerus eversmanni Kby, D. pratorum Fall., Allantus basalis Kl., Hartigia etorofensis Tak.) are recorded for the first time for this territory. Brief characteristics of zoogeographical and ecological features, literature data, a studied material are given for each species. Arealogical analysis showed that large part of the fauna has wide holarctic (9 species) and trans-euroasiatic (7 species) distribution. By trophic relations it was showed that most of species (17 species) are narrow oligophages. Most of larvae of sawflies develop on deciduous trees, shrubs and bushes: Betulaceae – 9, Rosaceae – 10, Salicaceae – 6. Of the number of potential pests can be noted 6 spe- cies of sawflies: Diprion pini L., Cimbex femoratus L., Dineura virididorsata Retz., Allantus basalis Kl., Nematus ribesii Scop., Nematus ribesicola Lqv.

The paper presents the results of the study of bats in Central Yakutia conducted in 2014–2015. The study included observations and live capture. In total, 42 bats were examined and then released in places where they had been captured. Echolocation calls were detected by means of an ultrasonic detector The Magenta «Bat 4» and were recorded on a digital voice recorder. The oscillograms were analysed in Cool Edit Pro 2.1 software environment. According to preliminary data, in the studied area, eastern water bat Myotis petax prevailed (69.0%), while Siberian bat M. sibiricus ranked the second place (29.0%). Ognev’s long-eared bat Plecotus ognevi was represented only by one specimen (2.0%). Myotis petax was larger as compared to M. sibiricus. The females of Myotis genus were larger than the males. The sex structure of bat population in the studied area was strongly shifted to predomination of females, most likely due to the presence of maternity colonies there. The activity of mouse-eared bats started with twilights and lasted 4.0 hours in June, 4.5 hours in July, and 3.0 hours in August in average. The duration of bats’ activity depended on insect activity which was determined by weather conditions. The fauna of ectoparasites in the studied bats comprised 8 species of mites and insects. The Parasitic Frequency Index (PFI) ranged from 53.3% (flea Myodopsylla trisellis) to 6.7% (flea Ischnopsyllus hexactenus). The highest Parasitic Abundance Index (PAI) was recorded for gamas- id mites (5.0 per a host in average). During hunting, bats emitted four basic types of echolocation calls. The signals were clearly detected within the frequency range from 15 to 50 kHz.

In summer 2016 observations were made on the consumption of soil moisture of oats sowing for grass mass under autumn irrigation conducted in autumn 2015 in the area "Moydooh" of agricultural firm "Ne- myugyu" (3 km from the town of Pokrovsk) on the territory of Khangalassky district of the Republic of Sakha (Yakutia). The first half of the year was dry and the second half was relatively moisture. Yet at the site with autumn irrigation with norm of 500 m³/ha the highest yield of green mass of oats (142.6 kg / ha) was pro- duced than at a bogara area (116.7 kg /ha). The value of evapotranspiration over the observed period on the area with irrigation was 195 mm and on the rainfed area – 172 mm.

It is shown that in case of assessment of durability of metal constructions of industrial buildings it is neces- sary to consider a factor of decrease of mechanical properties of steel under the influence of a hostile envi- ronment (corrosion). The results of long-term corrosion and mechanical testing of steels 09G2S and VSt3sp5 in the range of climatic temperatures are presented. The samples were exposed in the operational middle aggressive environment of enrichment plant concentrating shop of diamond-mining industry. It is revealed that in case of –60 °C and a term of exhibiting of 2,5 years the decrease in mechanical properties for steels VSt3sp5 and 09G2S reaches accordingly the following values: 13.6 and 13% by a fluidity limit; 9.0 and 11% by a temporary resistance; 19.3 and 15.3% by a relative lengthening. Special attention in the article is paid to the mechanism of the processes causing such results. A technique of assessment of durability of a metal- works which consists in determination of a moment after which a reduction of the sizes of cross sections and fall of durability of construction steels lead to exhaustion of the bearing capability of constructions is offered. The results of calculations of constructions durability confirming applicability of the developed methodical approach are provided.

The conception of statistical fractal (or multifractal) has been applied for analyzing the surface of deformation of ultrafine-grained steel specimens tested by tension at room and low climatic temperatures. It has been revealed that the surface of deformation of steel specimens processed by equal channel angular pressing is less rougher and uniform even after the fracture at low climatic temperature. The destruction had mainly ductile character. Application of the conception of statistical fractal allows to make a quantitative evaluation of the entropy processes connected with a damage accumulation and lifetime expiration.

For the enhancement of chemical and mechanical adhesion of natural diamond particles with a hard-alloy matrix during the synthesis of diamond-abrasive composites the hybrid technology which combined in one technological process the thermal-diffusion metallization of diamond particles and sintering by the developed scheme of the self-metering impregnation is proposed. This technology does not include a re-heating of the metallized coating that causes its destruction and enhances graphitization of diamond thus limiting the appli- cation of metallization method for improvement of diamond retention and creation of high-functional compo- sites for diamond tools. Formation and preservation of adhesion-durable metallized coating is confirmed by experiments simulating the conditions of high temperature interaction of diamond with a carbide-forming metal and a hard-alloy matrix during the sintering of special samples using the regimes of developed techno- logical process. The structural and phase state of the transition zone is studied by scanning electron micros- copy, X-ray structure analysis and X-ray phase analysis of the partition surfaces of the contact zone between the diamond and the matrix obtained by tensile testing of special samples. Comparative service properties tests of prototype and control samples of diamond dressers confirmed efficiency of the developed hybrid technology for the creation of highly resourceful diamond tools.

Data of monitoring of technical condition of the bridge through the river Protoka strengthened by compo- site materials and operated in climatic conditions of the Republic of Sakha (Yakutia) are provided in the article. Load-carrying capacity of the strengthened bridge superstructure taking into account the actual tech- nical condition at the fourth year of the operation of a pilot design is determined. On the basis of observations over the pilot design conclusions are made on efficiency of strengthening by composite materials on the basis of a carbon fiber. The most significant problematic issues of strengthening by composites in a zone of low temperatures are formulated.

Petrographic, mineralogical and petrochemical studies of the Cretaceous sandstones and burnt rocks sampled from the surface of a small conical hill Ten’-01 were conducted. As a result, the conclusions made by A.V. Kostin with co-authors that the rocks they sampled in course of expedition work are the products of volcanic activity are proved to be unreasonable. The fact of the presence of a volcano in the region is not es- tablished and hence the relation between the conical hill Ten’-01 and this volcano is denied. It is substantiat- ed that the stone material studied in the works by A.V. Kostin and co-authors belongs to burnt rocks. It seems most likely that the burnt rocks were derived from the Cretaceous sandstones as a result of spontaneous com- bustion of underground coal beds in the region. To the east of the Ten’-01 hill, at 20 km from the Kangalas- sky coal deposit, in the Molotov Pad’ locality there is found one more occurrence of burnt rocks derived from the same Cretaceous sandstones as a result of combustion of the same coal beds. The habit of the rocks is identical in both cases.

Main concepts of papers [1-4] which present alternative hypotheses for the formation of rocks of the structure Ten’-01 are discussed. Some mineralogical-petrographic criteria for distinguishing between the rocks formed during magma crystallization and those resulted from pyrogenous metamorphism of terrigenous- sedimentary substratum are given.