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The Laboratory of Tectonics was founded in 1959 and its first head was K.B. Mokshantsev – the Honored Scientist of the RSFSR and the YASSR, holder of the Order of Lenin, Doctor of Geological Mineralogical Sciences, then, in 1975-1984, the laboratory was headed by G.S.Gusev, Doctor of Geological Mineralogical Sciences. В In 1984-1998 the laboratory was headed by L.M.Parfenov, Honored Scientist of the Russian Federation, Academician of the Academy of Sciences of the Republic of Sakha (Yakutia), Professor, Doctor of Geological Mineralogical Sciences. Since 1998, the Laboratory of Geodynamics and Regional geology, formed on the basis of the laboratory of tectonics, seismology and ore-generating magmatic systems, has been headed by Candidate of Geological Mineralogical Sciences A.V.Prokopiev. The number of the laboratory is 15 people, 10 of them are researchers, including 1 doctor and 7 candidates of sciences.
RESEARCH DIRECTIONS
The main purpose of the laboratory’s geological research in the initial period was to generalize the accumulated geological and geophysical materials on the structure of the Earth’s crust of Yakutia and the creation of a regional tectonic framework for forecasting solid minerals, oil and gas. The main achievement of these studies is the first “Tectonic map of the Yakut ASSR and adjacent territories”. On the initiative and under the leadership of L.M. Parfenov, geodynamic and metallogenic maps of the mesozoid of the east of Russia and the northern rim of the Pacific Ocean were created, including the first “Geodynamic map of Yakutia and adjacent territories”; a generalizing monograph “Tectonics, geodynamics and metallogeny of the territory of the Republic of Sakha (Yakutia)” has been published.
Recent studies have focused on clarifying the general mechanisms of geodynamic development, magmatism and metallogeny of the eastern part of the Siberian craton and its folded framing, evolution of the Neoproterozoic-Phanerozoic continental margins of the Verkhoyansk-Kolyma folded region: from the sedimentary basin to the orogenic belt, the formation of collisional and accretionary orogenic belts of the Northeast Asia, correlations of various aged sedimentary and tectonic-magmatic events involving structural, lithological and lithochemical studies, U-Pb geochronology of detrital zircons and Sm-Nd and/or Sr isotope studies using low-temperature thermochronometry methods (AFTA and (U-Th)/He) and 40Ar/39Ar isotopy, U-Pb (SHRIMP) isotopic dating of magmatic zircons, Sm-Nd, Rb-Sr dating of granitoid plutons.
THE MAIN RESULTS OF THE WORK
The existence of the Verkhoyansk-Cherskiy and South-Verkhoyansk orogenic belts in the composition of the VKFR has been proved. The position on the interference of subsynchronous geodynamic events is proposed and proved, and its determining role in the formation of tectonic structures in Northeast Asia is shown. A structural and kinematic model of the formation of interference structures of the Verkhoyansk-Kolyma orogen in the Late Mesozoic is constructed. A generalization of the tectonic structure of the VKFR in the context of the formation of the Mesozoic orogenic belts of the Circum-Arctic has been performed, a new tectonic map based on geodynamics has been constructed.
A new “Map of seismotectonics of Eastern Siberia” has been published (together with Institute of Earth Crust SB RAS).
The main sources of debris removal have been identified and large river systems have been reconstructed: paleo-Taimyr, paleo-Lena, paleo-Khatanga and trans-Laurentia, and the margins of the paleopacific of the northwestern part of Pangea in the Late Paleozoic-Early Mesozoic period based on U-Pb dating of detrital zircons from deposits of the Arctic part of Eurasia (together with the universities of St. Petersburg, Stanford, West Virginia, Arizona, USA and Geological Institute RAS).
Sedimentary and paleogeographic models of the Early Carboniferous sedimentation of the northern part of the Verkhoyansk passive continental margin have been created, the features of the Devonian-Permian sedimentogenesis of the Arctic parts of the Siberian craton and the VKFR, the islands of the archipelagos of Novosibirsk and Severnaya Zemlya are determined, which change ideas about the history of the formation of sedimentary basins of the Arctic continental margins of Russia and are important for the development of hydrocarbon prospecting methods (together with St. Petersburg State University).
It is shown that the processes of continental rifting took place in the northeast of the Siberian craton at the turn of the Vendian-Early Cambrian, involving bimodal magmatism, from the turn of the Vendian and Cambrian to the end of the Terreneuvian epoch (Tommotian time). It is assumed that this magmatism has a riftogenic nature and, it is probably a part of the LIP of this age, localized in the Canadian Cordillera (together with St. Petersburg State University).
A density map of earthquake epicenters of the Lena-Taimyr seismotectonic zone of the Olenek folded belt has been constructed; the zone stretching from the Buor-Khaya Bay of the Laptev Sea through the Lena River delta and the Olenek Bay to the Taimyr Peninsula. The features of modern seismotectonic processes on the Laptev Sea shelf and the adjacent coast have been significantly clarified (together with YB of Geophysical Survey SB RAS, Institute of the Earth’s Crust SB RAS).
New data on the tectonics of the New Siberian Islands, Severnaya Zemlya, Novaya Zemlya, Franz Josef Archipelago have been obtained. For the first time, post-Early Permian deformations were identified in the Severnaya Zemlya archipelago and the direction of tectonic transport was determined; the occdurrence of the Ellesmerian orogeny on the New Siberian Islands has been proved; the nature of the geological complexes composing the De Long terrane has been determined (joint research with St. Petersburg State University, All-Russian Scientific Research Geological Institute, Institute of Geology and Mineralogy SB RS).
It is shown that the ultrabasite-basite complexes in the axial part of the VKFR differ from typical ophiolite and correspond to riftogenic ones. The strengthening of features characteristic of oceanic formations in the eastern direction suggests the presence of areas of oceanic crust or crust of a transitional type to the east of the Chersky Range.
The main petrological parameters and geodynamic conditions of the formation of igneous rocks of the transverse belts of granitoid plutons and dikes of the arctic part of the VKFR have been determined. A comparison of tin-bearing and non-tin-bearing ore-magmatic systems has been carried out, the relationship of cassiterite-silicate-sulfide mineralization with dikes of the basic composition of the subalkaline and alkaline series has been determined.
For the first time, U-Pb SHRIMP dating of zircons from 25 intrusions was performed, representative of the Main belt of granite batholiths of the Verkhoyansk-Kolyma folded region and the dykes associated with them, as well as rhyolites and andesites of the Uyandina-Yasachnaya magmatic arc. The peak of the formation of the main volume of magmatism occurs at 150+-3 million years (Kimmeridgian-Tithonian). Two less evident pulses of granitoid magmatism have also been revealed: Oxfordian (160-155 Ma) is only on the periphery of the southeastern part of the belt, and Berriasian (146-143 Ma) on the northwestern flank of the belt, which indicates the rejuvenation of plutons in a northwesterly direction along the belt strike (together with Northeastern Integrated Research Institute, FED RAS, Stanford University, West Virginia, USA).
The main research results in recent years have been published in well-known Russian and international journals: Geology and Geophysics, Geotectonics, Pacific Geology, Reports of the Academy of Sciences, Earth Physics, Gondwana Research, Tectonophysics, Lithosphere, Precambrian Research, Lithos, International Geology Review, Journal of the Geological Society, Journal of Asian Earth Sciences, Polar Research, Journal of Seismology, Geodynamics & Tectonophysics etc. The monograph has been published «Metallogenesis and tectonics of northeast Asia» (DPMGI, IGM, IGC, IEC SB RAS, FEGI, ITG FED RAS, together with geological institutes and universities of Mongolia, China, South Korea, Japan and the US Geological Survey).
Popular about what the study of the geodynamic evolution of the Kolyma-Omolon microcontinent has yielded (Grant RFBR № 19-05-00945)
ectonics and geodynamics
Main research areas
Geodynamic evolution of lithosphere and study of tectonic structures of the North-east Asia. Geodynamic evolution of the Phanerozoic continental margins and sedimentary basins; reconstruction of distributive provinces of sedimentary basins of the North-east Asia. Study of magmatic complexes – indicators of geodynamic settings.
Seismology
Main research areas
Study of seismicity, seismic setting and manifestations of catastrophic earthquakes and their aftershocks; study of stress state of the Earth’s crust and reconstruction of tectonic stress fields on geologic-structural and seismic data; seismic zonation of Yakutia and the North-east Asia, including identification of source zones of expected strong earthquakes; development of the modern geodynamic model with identification of plates and blocks, based on seismic-tectonic monitoring of environment.
Magmatic group of the Laboratory of geodynamics and regional geology(before May 2016 – laboratory of orogenic magmatism)
Main research areas
Study of mineralogy, petrology, geochemistry, geodynamic settings of formation, geochemical and metallogenic specialization of magmatic rocks of the North-east Verkhoyansk-Kolyma orogenic region.