Revised Neoproterozoic and Terreneuvian stratigraphy of the Lena-Anabar Basin and north-western slope of the Olenek Uplift, Siberian Platform

2015 ◽  
Vol 270 ◽  
pp. 226-245 ◽  
Author(s):  
Konstantin E. Nagovitsin ◽  
Vladimir I. Rogov ◽  
Vasiliy V. Marusin ◽  
Galina A. Karlova ◽  
Anton V. Kolesnikov ◽  
...  
Keyword(s):  
Siberian Platform ◽  
Western Slope ◽  
North Western ◽  
Olenek Uplift

scholarly journals Glauconite of terrigenous-carbonate deposits from the lower Cambrian (Northern Siberia, Olenek uplift)

2019 ◽  
pp. 295-317
Author(s):  
Т. А. Ivanovskaya ◽  
A. R. Geptner ◽  
А. Т. Savichev ◽  
Т. S. Zaitseva ◽  
N. V. Gor’kova ◽  
...  
Keyword(s):  
Lower Cambrian ◽  
Cell Parameter ◽  
Western Slope ◽  
Northern Siberia ◽  
Stratigraphic Position ◽  
First Time ◽  
North Western ◽  
Olenek Uplift ◽  
Carbonate Deposits

The detailed mineralogical peculiarities are reported for the first time of the glauconite of the Lower Cambrian (Tommotian stage) extracted from the terrigenous-carbonate deposits at the upper part of the Kessyusa series (the roof of the Mattaia Formation and the lower part of the Chuskuna Formation) as well as basal layers of the overlying limestone, too. Samples were taken from three sections of north-western slope of the Olenek uplift, northern Siberia; their stratigraphic position is given on the basis of modern data [Nagovitsin et al., 2015, and others]. Grains of layer silicates are represented by mica-smectite phyllosilicates with a relatively low content and with an elevated content of smectite layers (<10 and 10–20%, respectively), (the unit-cell parameter b = 9.06–9.12 Å). Micaceous minerals form a range from glauconite to Al-glauconite (КAl = VIAl/(VIFe3+ + VIAl) = 0.11–0.47 и 0.60, respectively; K2O content is 6.80–8.54%. Detailed litho-mineralogical peculiarities of glauconite-bearing sediments are given for the first time. Their primary deposits according to [Marusin, 2016] accumulated in the conditions of the shoreface and the offshore-transition zone of the Siberian epicontinental marine paleobasin. The origin (autogenic, allothigenic) of the studied grains, their secondary changes (rewashed in situ, phosphatization, pyritization, calcitization, ferruginization, etc.) at different stages of lithogenesis are discussed. It is shown that the obtained preliminary Rb-Sr dates (450–320 Ma) were ”rejuvenated”: they do not meet the age values previously adopted for the the Vendian-Lower Cambrian boundary — 541.0 Ma [Gradstein et al., 2012]. This may be due to various secondary alterations of glauconite grains during rewashing, transportation, and also at different stages of diagenesis in primary sediments and after re-deposition, as well as at the stages of catagenesis (deep diagenesis) and hypergenesis of glauconite-bearing rocks.

scholarly journals KLYUCHEVSKOY VOLCANO: NEW FLANK ERUPTION NAMED AFTER G.S. GORSHKOV, 2021 (KAMCHATKA)

2021 ◽  
pp. 5-9
Author(s):  
A.Yu. Ozerov ◽  
◽  
O.A. Girina, ◽  
D.V. Melnikov, ◽  
I.A. Nuzhdaev ◽  
...  
Keyword(s):  
Lava Flow ◽  
Cinder Cone ◽  
Western Slope ◽  
Flank Eruption ◽  
Associate Member ◽  
North West ◽  
North East ◽  
The North ◽  
River Bed ◽  
North Western

February 18, 2021, a flank eruption started on the north-western slope of the Klyuchevskoy Volcano (Kamchatka, Russia). Cinder cone was formed at the altitude of 2 850 m above sea level, from which a lava flow was spreading north-west. Having moved 1.2 km downslope, the lava flow entered the Ehrmann Glacier, which resulted in the formation of huge mud-stone flows. The latter made their way further north-east along the Kruten’kaya River bed and reached the length of about 30 km. The eruption brought onto the surface high-aluminous basaltic andesites typical of the Klyuchevskoy Volcano. By March 21, the flank eruption ended. It has been named after G.S. Gorshkov, associate member of USSR Academy of Science, famous Russian volcanologist.

scholarly journals MORPHOMETRIC CHARACTERISTICS OF RIVER BASINS OF THE NORTH-WESTERN SLOPE OF THE CRIMEAN MOUNTAINS (ZAPADNYY BULGANAK, ALMA, KACHA, BELBEK, CHERNAYA RIVER BASINS)

2021 ◽  
Vol 7 (73) (3) ◽  
pp. 267-278
Author(s):  
V. A. Tabunshchik
Keyword(s):  
River Basin ◽  
Calculated Data ◽  
River Basins ◽  
Shuttle Radar Topography Mission ◽  
Western Slope ◽  
Morphometric Characteristics ◽  
Crimean Peninsula ◽  
Crimean Mountains ◽  
The North ◽  
North Western

Zapadnyy Bulganak, Alma, Kacha, Belbek, Chernaya rivers belong to the rivers of the north-western slope of the Crimean Mountains. The sources of the rivers are located on the north-western slopes of the Main Ridge of the Crimean Mountains, then the rivers flow from east to west almost parallel to each other. Up to about the middle of their course, they have a character typical of mountain streams (except for the Zapadnyy Bulganak River). The river valleys in the upper reaches are V-shaped, narrow, their slopes are dissected by numerous gullies and tributaries. There are almost no tributaries in the middle and lower reaches. In the low-water period (low-water period), drying is observed in the estuaries of rivers. The catchment basins have an elongated shape along the river, expanded in the upper part, which is the main feeding area.The considered river basins, although they have, in comparison with the rest, the river basins of the Crimean Peninsula, are better studied in general, but they are not sufficiently studied. In the article author deals with the main morphometric characteristics of river basins of the North-Western slope of the Crimean Mountains. Using Shuttle Radar Topography Mission (SRTM) and ArcGIS software for river basins Zapadnyy Bulganak, Alma, Kacha, Belbek, Chernaya are analyzed the following morphometric parameters – area of the basin, the symmetry of the basin, length of the basin, width of the basin, configuration and irregularity of the outline of river basin, the highest and lowest elevation within the basin, the average altitude of the river basin, the average slope of the river basin. Some of the morphometric indicators are calculated for the first time. For morphometric indicators that were partially previously calculated using topographic maps and published in literature, a comparison and analysis with the calculated data is provided. It is established that the using of SRTM and the ArcGIS software allows for fairly accurate measurements of morphometric indicators of the river basin.

Seismogravimetric Methodology: Specifics and Applicability to the Siberian Platform

2021 ◽  
Vol 62 (07) ◽  
pp. 790-797
Author(s):  
V.A. Kochnev
Keyword(s):  
Siberian Platform ◽  
Seismic Data ◽  
Western Slope ◽  
Static Corrections ◽  
Comparison Of The Results ◽  
Experimental Processing

Abstract —The paper presents a new seismogravimetric method for estimating static corrections used in processing of seismic data and in construction of time and depth sections. The method efficiency is demonstrated by comparison of the results of industrial and new experimental processing of data for the western slope of the Nepa–Botuoba anteclise.

Chemostratigraphy and detrital zircon geochronology of the Neoproterozoic Khorbusuonka Group, Olenek Uplift, Northeastern Siberian platform

2017 ◽  
Vol 51 ◽  
pp. 255-271 ◽  
Author(s):  
Irina A. Vishnevskaya ◽  
Elena F. Letnikova ◽  
Natalia I. Vetrova ◽  
Boris B. Kochnev ◽  
Sergei I. Dril
Keyword(s):  
Siberian Platform ◽  
Detrital Zircon ◽  
Zircon Geochronology ◽  
Detrital Zircon Geochronology ◽  
Olenek Uplift

Paleomagnetic data of the Siberian Mesoproterozoic rocks (Udzha Uplift, Northern Siberia)

2020 ◽  
Author(s):  
Aleksandr Pasenko ◽  
Aleksandr Savelev ◽  
Sergey Malyshev
Keyword(s):  
Siberian Platform ◽  
Paleomagnetic Data ◽  
Russian Science ◽  
Polar Wander ◽  
Late Precambrian ◽  
Apparent Polar Wander Path ◽  
The Earth ◽  
Isotope Studies ◽  
Paleomagnetic Poles ◽  
Olenek Uplift

&lt;p&gt;In spite of the fact, that during the last two decades some number of new paleomagnetic poles, more or less meeting the modern standards of quality [Van der Voo, 1993], have been obtained for Mesoproterozoic of Siberia [Evans et al., 2016]. The problem of the Precambrian segment of the apparent polar wander path (APWP) for Siberia, rests still to be far from its solution.&lt;/p&gt;&lt;p&gt;The latter, obviously, hampers the elaboration of Precambrian paleogeographic reconstructions, solution of numerous other important tasks of the Earth Sciences.&lt;/p&gt;&lt;p&gt;The Late Precambrian key section of the Udzha Uplift seemed to be one of the most promising object to elaborate the Mesoproterozoic segment of APWP of the Siberian platform. Until recently, the rocks composing this section have been considered to be of the Mesoproterozoic and Vendian age.&lt;/p&gt;&lt;p&gt;As a result of isotope studies in recent years, the age of formations of the Udzha Uplift has been significantly increased (1386&amp;#177;30 Ma, apatite, U-Pb, [Malyshev et al., 2018]). In particular, age of the Udzha Fm, which forms the uppermost part of the Udzha riphean sequence is considered currently to be Mesoproterosoic. On the base of our new paleomagnetic data this formation has been formed about the same time as the Khaypakh Fm from the Olenek Uplift (NE Siberia), whose Mesoproterozoic age has been established earlier from independent isotopic data [Zaitseva et al., 2017].&lt;/p&gt;&lt;p&gt;During last several years we have carried out the paleomagnetic studies of Late Precambrian rocks of the Udzha Uplift including the Mesoproterozoic Udzha and Unguokhtakh formations as well as intrusions representing two Mesoproterozoic magmatic events.&lt;/p&gt;&lt;p&gt;In this abstract we present new paleomagnetic poles for the Mesoproterosoic rocks (1500 Ma, ca.1400 Ma, 1385 Ma) of the Siberian platform.&lt;/p&gt;&lt;p&gt;These paleomagnetic poles significantly complement the Mesoproterozoic segment of APWP of the Siberian Platform.&lt;/p&gt;&lt;p&gt;&lt;em&gt;The studies were supported by the Russian Science Foundation project &amp;#8470; 19-77-10048.&lt;/em&gt;&lt;/p&gt;

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