Morphological analysis and U/Pb LA-ICP-MS dating were carried out for detrital zircon (400 age determinations) from four core samples of Triassic rocks recovered by Well Severnaya (Graham Bell Island, Franz Josef Land Archipelago). It is shown that source areas were mainly composed of peraluminous granites. U/Pb LA-ICP-MS zircon data were used to decipher the provenance evolution in the northern Barents Sea region. The main source of clastic material in the North Barents sedimentary basin in the Middle-Late Triassic was the Uralian fold belt, with lesser contribution from the East European Craton (Baltica), Timanides, Taimyr, and rocks related to the Siberian plume. The clastic material was mainly transported from the south and southeast. From the beginning of the Middle to the terminal Late Triassic, influence of the Neoproterozoic sources systematically decreased, whereas contribution of Caledonian sources increased.

113 Архипелаг Земля Франца Иосифа является одним из ключевых объектов для реконструкции истории триасового осадконакопления на севере Баренцевоморского региона (рис. 1). Эти иссле дования имеют как научное, так и прикладное значение в связи с наличием значительных запа сов углеводородов в Баренцевом море. Рекон струкция возраста и состава источников сноса об ломочного материала для триасовых отложений Арктики является актуальной задачей, активно обсуждаемой в научной литературе в последнее десятилетие [Miller et al., 2006; Pease et al., 2007; Петров, 2010; Bue et al., 2011; Omma et al., 2012; Miller et al., 2013; Bue, Andersen, 2013]. Определе ние возраста единичных зерен прецизионными геохронологическими методами открывает новые возможности для изучения терригенных пород. Циркон – минерал, широко распространенный в обломочных породах и весьма устойчивый к вы ветриванию и разрушению. Для датирования от дельных обломочных зерен циркона применен U/Pb LA ICP MS метод [Gehrels, 2011; и др.]. Их морфология несет важную информацию об ис точниках сноса [Zircon, 2003], а типоморфизм [Pupin, 1980; Belousova et al., 2006] позволяет определить физико химические условия (темпе ратура, давление, агпаитность) образования раз мываемых комплексов. В данной работе проведе но комплексное изучение возраста, типоморфиз ма и внутреннего строения зерен обломочного циркона для характеристики источников сноса и проведения региональных палеогеографических реконструкций.

2D and 3D geotemperature models of the sedimentary cover within the Laptev Sea shelf have been calculated. The presence of several "thermal domes" (zones of uplifted isotherms) has been found. Based on analogous sedimentary basins with domes, which correlate to the location of hydrocarbon deposits, the fore-casting has been made that the Ust-Lena graben and Omoloi trough are the most promising areas for oil-and-gas prospecting.

The dramatic rise in the world oil and gas demand has led to concerns about the energy future for mankind. In the twenty-first century the sedimentary basins of the Arctic Ocean will play a leading role as petroleum provinces, including its Russian shelf areas. This article deals with the characteristics and assessment of resources in the Russian sector of the Arctic Ocean offshore areas. One can predict with 0.90 probability that the Arctic Ocean initial in-place hydrocarbon resources exceed 90 billion tons oil equivalent (toe). The assessments lead to the conclusion that during these years a petroleum production industry will develop on the Arctic Ocean Shelf.

The main part of the hydrocarbon resources and reserves of the Russian Arctic Shelf is concentrated in the Barents ( with Pechora) and Kara seas. These resources and reserves are mainly represented by gas. Only this part of the Russian Arctic Shelf is ready for development. The geological models of the vast eastern part of the shelf and subsequent quantitative assessments of hydrocarbon resources based on them are rough estimations. Some lithofacies and palaeographic maps illustrate the key stages of the Palaeozoic-Mesozoic geological evolution of the Barents-Kara sea areas.

The Arctic shelf of Russia bears huge oil and gas resources. Twenty-seven oil and gas fields (including ten sea-coastal) were discovered in the Barents (with the Pechora) and Kara Seas. Today, however, none of the offshore fields is developed, and the overall degree of the geological and geophysical study of the shelf is still low. A complex of actions is proposed to accelerate the exploration and development of oil and gas resources of the Russian Arctic seas.

The overall jump in global demand for gas, and especially oil, gives rise to particular concern regarding mankind’s energy future. In the middle and late 21st century, the crucial role in securing oil and gas supply of mankind will be played by sedimentary basins in the Arctic Ocean deep-water area, including those of the continental shelf in Russia’s Arctic seas. There is a 0.90 probability that the initial in-place resources of hydrocarbons in the Arctic Ocean will be greater than 90 Btoe. The estimates predict the rise of oil and gas industries on the Arctic shelves in the near future.

2D and 3D modeling of the geothermal field was carried out along seven extended geotraverses in the Barents Sea compiled on the basis of CMP profiling and results of deep drilling. Depths of the zone characterized by catagenetic transformation of organic matter were calculated for different areas of the sedimentary basin. The minimal depth is confined to the South Barents Basin with the highest hydrocarbon resource potential established by geological exploration. In 3D models, this area is distinguished by a thermal dome recognized for the first time.

An oil geological zoning of the East-Arctic shelf of Russia is adduced. The evaluation of oil-and-gas content of the sedimentary cover in the defined perspective oil-and-gas bearing provinces and areas is given.

It is marked, that development of resources of the Arctic shelf is expedient for beginning with areas where deposits are already open. The centres of oil and gas recovery in the most investigated areas of the Arctic seas waters are allocated. Necessity strictly to adhere to the accepted licensing program in the West-Arctic seas waters and to carry out systematic studying the East-Arctic seas is underlined.

В системе сочленения бассейнов Атлантического и Северного Ледовитогоокеанов вырисовывается почти идентичный структурно-кинематический рисунокСкандинавского и Кольского п-овов: 1) в тылу Скандинавии, испытывающей внастоящее время воздымание, находится субпрямоугольно-коленообразнаяортогональная система растяжения – Балтийское море (субширотное звено) сБотническим заливом (субмеридиональное звено); 2) в тылу Кольского п-ова,испытавшего вместе с п-овами Средний и Рыбачий в послеледниковое время подъем на100м и более, находится подобная, но диагональная система Кандалакшский залив(запад-северо-западное звено) – Белое море (север-северо-восточное звено), занявшаякилевую часть эпибайкальского авлакогена. Таким образом, в обоих случаях работаеткинематическая схема: растяжение (проседание) в тыловых южной и восточной частяхи компенсирующее сжатие (воздымание) во фронтальных северной и западной частях,отвесно обрывающихся в сопредельные акватории.

Invited Plenary Lecture Summary: The fundamental features of evolution and hydrocarbon potential of the Eurasian continental margin are considered in the light of structure and geological history of major shelf basins whose level of exploration and geo­ dynamic position vary from west to east. The best studied Barents-North Kara Basin is a typical passive margin which borders the Eurasian oceanic opening and displays a prolonged pre-breakup depositional history spanning almost the entire Paleozoic and Mesozoic eras and resulting in a great thickness of sediments with positively proven oil and gas potential. Unique gas condensate fields have also been discovered in the South Kara Basin, although the accumulation of cover sequences did not begin here until about the Paleo­ zoic/Mesozoic time boundary and was probably more influenced by the events in the West Siberian province than in the central Arctic. The location of the Laptev Basin at a unique structural 'I-junction between continental margin and the Eurasian spreading axis accounts for a specific geodynamic environment leading to post-breakup extension and associated formation ofunusually stret­ ched and thinned continental crust beneath a substantial thickness ofpredomi­ nantly latest Mesozoic and Cenozoic sediments. Although the least explored East Siberian and Chukchi Basins represent an apparent morphostructural transition from north-eastern continental Asia to the central Arctic Ocean, their designation as a typical passive margin may, perhaps, be questioned until evolutionary links between the formation of the Amerasian oceanic deep seabed and late Mesozoic - Cenozoic processes of subsidence and sedimen­ tation in eastern basins are established with greater confidence. Because of an outstanding oil and gas potential of the Eurasian continental margin, the fundamental and applied dimensions of its earth science explora­ tion have always been closely interrelated. Of particular interest in a funda­ mental context are - the examination of the structural and evolutionary continuity between the Eurasian Arctic margin and its neighboring crustal assemblages on both the mainland and the oceanic sides; - unraveling the formation of different parts of this margin in relation to Cenozoic geodynamic processes in the Arctic Ocean; - the issues related to expansion of continental crust in the course of its extensional stretching; - palinspastic reconstructions accounting for the changes in dimensions of continental masses in the course oftheir pre- and post-breakup evolution, - and studies of deep interior processes causing reorganizations at the upper level of the lithosphere. Among more specific research objectives are - the recognition of syn-oceanic structural elements and tectonic events as opposed to features inherited from the pre-oceanic evolution; - determining the lithostratigraphic composition of the sedimentary cover and developing tectono-stratigraphic concepts for basin modeling; identifying the factors influencing generation and preservation of hydro­ carbons and the criteria for discriminating between predominantly oil- and gas-bearing basins.

l , Oleg LSuprunenko l Summary: The tectonic basement of the Eurasian Arctic shelf is a combination of tectonic blocks. The basernent comprises crystallinc metamorphic and ignc­ ous assemblages along with intensely dcformed and mctamorphoscd stratified assemblages. In contrast to an oceanic basement which is primarily igneous a continental basernenr has been originated as a result of the assembly of previ­ ously geodynamically variable terrancs into a relativcly stable regional tectonic domain (superblock or superterrane). Aseries of superblocks varying in the con­ solidation age has been mappcd: Pre-Riphcan, Grenvillian, Riphean, Calcdonian, Ellesmerian, Hercynian, ancl Late Mesozoic. Earlier consolidatcd rigid blocks have been captured wirhin the superblocks. There are extensive areas of deeply submerged basement (more than 10 km) and the composition is believed to be of oceanic type. The basement superblocks have undergonc constructive and destructive altera­ tions through thc post consolidation history. Large scale constructive processes took place in the west in thc Ordovieian-Devonian and in the Carboniferous to Early Jurassic, and thc late Mesozoic in thc cast. Major dcstructive events took place in the Devonian to early Carboniferous, in the late Pennian to Triassie. in the late Jurassie to early Cretaceous, and front the late Cretaeeous to Recent. The main aim of this paper is to provide constraints and to indieate a starting point for building models of geodynamic cvolution of the Arctie.