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The urgency of the problem studied in the paper is conditioned by the fact that stable functioning and development of economic entities, sectors of the economy, regions and the country cannot be carried out without investments. In the modern economy of the Russian Federation, whose conditions of existence can be called non-stationary, one of the problems is attracting investment resources into economic activity and overcoming the conditions for slowing and stopping the growth of the country's economy caused by external unfavorable economic circumstances. In connection with the foregoing, the policy of attracting and managing investments in the regions of the Russian Federation, with a view to ensuring conditions for overcoming the crisis phenomena and resuming the economic growth of the country and its subjects is of particular interest. The G. M. Kvon et al. 836intensification of the state investment policy is a core prerequisite for the transition of the economy to sustainable growth. However, in economic market conditions the state is not able to solve this problem to the full. Therefore, the process of activating investment policy at the regional level is becoming topical. The purpose of the paper is to study the management and implementation of investment policy in the region on the example of the Republic of Tatarstan, the analysis and assessment of the investment environment's state. The leading method to research this problem is the statistical one, which is a method of quantitative analysis of a set of homogeneous facts that determine in the aggregate the transition of quantitative changes to qualitative ones. The paper presents the results of assessing the socio-economic development of the region, analyzes the indicators that allow characterizing the investment environment's state. The paper also presents the strategic priorities of the region's investment activities, analyzes the opportunities for their implementation in conditions of non-stationary state, and makes sound conclusions about the need to activate regional investment policies. The materials of the paper are of practical value for specialists dealing with the implementation of the investment policy of the region.

The paper presents the results of comprehensive study of the primary diamond deposit of the Nyurbinskaya pipe in the Yakutian diamondiferous province. It is established, that the pipe is confined to the fault junction of four directions and is composed of the kimberlite of four phases. Analysis of different faults and tectonic fracturing allowed to reconstruct the tectonic stress fields acting at the stage of the kimberlite body formation and to determine their occurrence sequence in time. The data obtained about regularities of the Nyurbinskaya pipe compositional structure and results of geologo-structural studies are combined in a single structural-compositional model of the deposit formation. Peculiarities of the fault network operation during the deposit formation stage are confirmed by experimental results using polarization-optical method. The model allowed to formulate the basic structural characteristics of the prospecting works object within which the formation of kimberlite body type of the Nyurbinskaya pipe is possible and to determine the elements of the fault network which are promising for the kimberlite pipes discovery. Recommended by D.P. GladkochubFor citation: Gladkov A.S., Koshkarev D.A., Cheremnykh A.V., João F., Karpenko M.A., Marchuk M.V., Potekhina I.A. 2016. Structural-compositional model of the Nyurbinskaya kimberlite pipe formation (Sredne-Markha area of the Yakutian Diamondiferous Province). Аннотация: В статье представлены результаты комплексного изучения коренного месторождения алмазов трубка Нюрбинская. Установлено, что трубка приурочена к узлу разломов четырех направлений и сложена T e c t o n o p h y s i c s 435 A.S. Gladkov et al.: Structural-compositional model of the Nyurbinskaya kimberlite pipe formation…кимберлитами четырех фаз. Анализ разноранговых разрывных нарушений и тектонической трещиноватости позволил восстановить поля тектонических напряжений, действовавшие на этапе формирования кимберлитового тела и определить последовательность их проявления во времени. Полученные данные о закономерностях вещественного строения трубки Нюрбинской и результаты геолого-структурных исследований объединены в рамках единой структурно-вещественной модели формирования месторождения. Особенности функционирования разрывной сети на этапе формирования месторождения подтверждены результатами экспериментов с использованием поляризационно-оптического метода. Полученная модель позволила сформулировать признаки, определяющие основные структурные характеристики объекта поисковых работ, в пределах которого возможно формирование кимберлитовых тел типа трубки Нюрбинской, и на их основании выделить те элементы разломной сети (разломные узлы), которые являются перспективными для обнаружения кимберлитовых трубок. Ключевые слова: кимберлиты; Якутская алмазоносная провинция; структурно-тектоническая модель;структурно-вещественная модель

Four original monomineral methods for mantle peridotite associations are used to reconstruct P–T conditions beneath the kimberlite pipes of Yakutia. The clinopyroxene Jd–Di method gives the closest coincidence with Opx barometry in accord with all physico-chemical boundaries. Garnet thermometers calibrated using Opx, Gar–Cpx and Ni-garnet thermometers and two variants of barometers were developed separately for pyroxenites and peridotites. A Cr–Sp thermobarometer uses the monomineralic version of the Ol–Sp thermometer and a newly calibrated Cr–Sp barometer. A picroilmenite method uses the Ol–Sp thermometer and a pressure-calibration of the geikielite component. Each mantle column is divided into two (upper and lower) sections by a pyroxenite layer located near 40 kbar. Below the pyroxenite layer, the lower section comprises 3–4 lithologically distinct horizons, with a thermally perturbed layer at the base. Above the pyroxenite layer are 3–5 lithologically distinct horizons, which are more fertile than the lower sections. Splitting of the geotherms characterizes most P–T diagrams and is ascribed to multistage melt percolation processes typical for the mantle beneath kimberlite pipes. The largest pipes are diamond-bearing and have a highly depleted peridotite lens above the asthenospheric layer.