Aleksey Amantov

Aleksey Amantov
A.P. Karpinsky Russian Geological Research Institute | VSEGEI · Marine and environmental geology

PhD

About

68
Publications
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331
Citations

Publications

Publications (68)
Article
Full-text available
The observed present rate of uplift in Scandinavia increases from zero on the western coast of Norway to ~1 cm/yr in the Baltic Sea area. This domelike uplift is generally assumed to be the result of glacial isostasy due to melting of the huge glacier in Late Pleistocene. The mountain glaciers of Norway have previously not been considered to affect...
Research
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Abstracts of the 4th Paleolimnological Conference, Irkutsk, Russia, 2-4 September 2020
Conference Paper
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The geomorphological evolution of several huge lake basins in the Pleistocene glacial and periglacial domains was analyzed with the combination of relevant modeling and geological data. It is found that most basins were occupied by large lakes classified as structural - denudational forms, when the pattern of uneven glacial erosion was influenced b...
Article
Full-text available
Surface loading resulted from intense urban development of coastal areas can cause minor land subsidence and relative sea level rise. The subsidence strongly depends on physical properties of the lithosphere, asthenosphere, and mantle, as well the loading and its change rate. The magnitude and area of the urban surface load over time were assessed...
Chapter
Full-text available
This section provides a general description of the bedrock geology of the Lake Ladoga basin (In Russian).
Chapter
Full-text available
The Quaternary development of the Lake Ladoga is discussed, with the suggested usual scenario of growing of Pleistocene glaciations in the Baltic Region. (In Russian).
Article
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Level of Lake Ladoga has changed for several times after its basin got free from glacier and during the Holocene. The last transgressive stage which is called Ladoga transgression ended around 3 thousand years BP. Different points of view, concerning the duration of lake level drop, exist. These estimates include either “catastrophic” scenarios or...
Article
About 60% of Svalbard is covered by glaciers today, but many of these glaciers were much reduced in size or gone in the Early Holocene. High resolution modeling of the glacial isostatic rebound reveals that the largest glaciers in Nordaustlandet and eastern Spitsbergen survived the Early Holocene warming, while the smaller, more peripheral glaciers...
Data
Meso-Cenozoic exhumation and relevant isostatic process: The Barents and Kara shelves - Elsevier's free 50 days link
Article
Full-text available
Fennoscandia has experienced major uplift since late-glacial time. However, in the Younger Dryas (~12,700-11,500 calibrated years before present) 10 metres of transgression occurred at the Norwegian west coast. This transgression was most significant in the area around Bergen; both to the north and to the south of this area the relative sea level f...
Article
Fennoscandia and Arctic shelves are known to have experienced several periods of Meso-Cenozoic uplift and erosion, but their magnitude and timing are still debated. The aim of our study is to estimate erosion volumes and distinguish between different erosional episodes, including glacial and pre-glacial ones. Our estimation approach is based on a co...
Article
Many of the Earth's sedimentary basins are affected by glaciations. Repeated glaciations over the last millions of years had great influence on the physical conditions in sedimentary basins and on basin structuring. This paper presents some of the major effects that glaciations have on sedimentary basins including examples of quantifications of the...
Conference Paper
Eustatic changes have interrelations with other long-term processes, connected with the glacial activity and related isostatic adjustment. Topographic changes in glacial and periglacial areas, linked with sediment- and hydro-isostasy, influence the redistribution of amount of water globally before and after glaciations. Glacial erosion is a signifi...
Article
Full-text available
Scandinavia is one of the key areas for research on glacial isostatic adjustment. Extensive modeling of the late- and post-glacial rebound in Fennoscandia has been done over the recent years, but unfortunately the suggested Earth rheology varies a lot among the researchers. Most of the researchers argue for a significant viscosity change from upper...
Chapter
Full-text available
The Barents Seafloor has undergone substantial land uplift in response to the ice load of the extensive last glaciation. A number of modeling approaches have been carried out over the last 100 years in order to understand the implications for possible migration pathways of oil and gas. However, the thickness of the former ice sheet was not well con...
Article
Full-text available
On the basis of a combination of physical models of the isostatic relaxation after deglaciation with geological-geomorphological verification the attempted reconstruction of the late-glacial development of Lake Ladoga and the eastern part of the Gulf of Finland was carried out, with evaluation of the dynamics of changes of coastal lines and the est...
Conference Paper
Full-text available
Lake Ladoga’s basin was formed within the fragment of the slope of the Baltic Shield, complicated by the Riphean (Jotnian) Ladoga-Pasha graben-syncline. It belongs to the family of Jotnian structures spatially located around large Gothian intrusive bodies in contrast with linear extended aulacogens. Platform strata thin out with erosional truncatio...
Conference Paper
Full-text available
Eustatic changes have interrelations with other long-term processes, connected with the glacial activity and related isostatic adjustment. Topographic changes in glacial and periglacial areas, linked with sediment- and hydro-isostasy, influence the redistribution of amount of water globally before and after glaciations. Glacial erosion is a signifi...
Article
Reconstructions of ice cover during the time spanning the Late Weichselian maximum show a confluent Eurasian ice sheet with the Scandinavian Ice Sheet positioned between the Svalbard-Barents-Kara and the British-Irish ice sheets. It has long been suspected among glacial geologists that the maximum ice-marginal position was asynchronous, but only re...
Article
Full-text available
Post-glacial Holocene development in Southern Priladozhye (south Lake Ladoga region) is studied by combining the modeling of post-glacial uplift with geological-geomorphological-geophysical observations. The focus is on the archeological sight Podolye-1 in the southern Lake Ladoga coastal zone. Such combination is shown to give reasonable scenario,...
Conference Paper
Full-text available
The eastern Gulf of Finland – Lake Ladoga region-is at the peripheral part of the Fennoscandian post-glacial uplift. We compared different modeling results for this region with observations, including our revision of geomorphological traces of paleo shorelevel. The general Baltic-White Sea bedrock lowland at the margin of Fennoscandian Shield is ch...
Conference Paper
Full-text available
Rheological properties used in GIA models require independent verifications and possible modifications. To estimate the flexural rigidity of the lithosphere in simple platform areas we use peneplain distortion, which enable us to compute isostatic response from sediment load and compare the results with observed changes in geometry. This was done f...
Article
We examine three questions concerning the post-glacial geological history of the eastern Gulf of Finland: (1) the amplitude of the Holocene sea-level regressions; (2) the time and mechanism of the development of large sand accretion forms (bars and spits), including dunes; and (3) the sea-level changes and coastal development over the last 4 kyr. R...
Poster
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The aim of the study was to improve our understanding of the timing, geometry and magnitude of the Neogene and Quaternary erosion and uplift of the Barents Sea
Presentation
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From the Scandinavian post-glacial rebound we have found that the flexural rigidity of the lithosphere is 5·10**23 Nm (effective elastic thickness of 30–40 km). Isostatic adjustment to redistribution of water and sediment loads is rarely considered in regional geomorphological modeling with skyline reconstructions of different surfaces, and estimat...
Poster
Full-text available
1. Lake Ladoga basin is clearly a product of Cenozoic erosion, with the dominant role in glacial time. Different resistance of Mesoproterozoic formations causes the contrast relief. We consider the deepest northwestern part as the world largest glacial cirque. 2. Sub-Upper Vendian peneplain (base of the “proper” sedimentary cover) and other major U...
Poster
Full-text available
Fennoscandia has experienced major uplift in post-glacial time. However, in Younger Dryas (YD; 12 000 BP) there is observed 10 meters transgression at the Norwegian west coast. The transgression was most significant in the Bergen area; both north of this area and south of this area the relative sea level fell during YD. In the area of transgression...
Data
Full-text available
Article
Full-text available
A. V. Amantov Geology of Pre-Quaternary Formations and Tectonics of the Lake Ladoga Lake Ladoga’s basin was formed within the fragment of the margin of the Baltic Shield, complicated by the large Riphean Ladoga-Pasha graben-syncline. Structural complexes of the Archean or Early Proterozoic basement and the Late Vendian – Paleozoic platform cove...
Article
Full-text available
Implication of Glacial Theory to the Development of the Lake Ladoga Basin A. Amantov & M. Amantova The general concept of the formation of pre-Quaternary surface and, in many ways, the modern landscape of Lake Ladoga is discussed as a result of geological-geomorphological analysis including specialized computer modeling systems, with implications...
Article
Linked geological, geomorphological and tectonic features of Fennoscandia with adjacent regions of East-European plain and Barents-Kara shelf indirectly influenced the history of glacial grows and decays. The first-order bedrock landscape elements (often created or exhumed during pre-glacial Cenozoic stages) were the major factors that could partly...
Article
Baltic - Lake Ladoga - White Sea structural-denudational lowland extends along the margin of the Baltic (Fennoscandian) Shield. Its deepest parts in the bedrock and modern landscape usually coincide with zones of cropping out of the post-late Vendian platform non-metamorphosed cover or outcrops of Riphean formations that overly metamorphic basement...
Article
Defining the ice load in a way that avoids circularity is perhaps the most difficult aspect of GIA modeling. At any instant of past time the global land-supported ice load must honor the meltwater curve and the known edges of the ice, but within these constraints the ice mass can be swapped to a considerable extent between the various glacial syste...
Article
Full-text available
Linked geological, geomorphological and tectonic features of the Baltic Sea lowland and adjacent areas strongly impacted the history of glacial grows and decays, while the bedrock landscape seems to be the major linking and controlling factor. First-order landforms could in favorable conditions control both center of ice nucleation, and serve natur...
Conference Paper
Full-text available
Basin modeling aims at reconstructing the time evolution of a sedimentary basin in order to make quantitative predictions of hydrocarbons accumulations. With increasing geological complexity of relevant sedimentary basins, there is a growing need for basin modeling tools that can handle more of the complex controlling geological processes that lead...
Presentation
Full-text available
Geophysical Research Abstracts, Vol. 14, EGU2012-1431, 2012
Article
Cirques are usually considered as specific landforms of hill and mountain terrains produced by alpine glaciers, and/or slope failures (landslides). However, glacial cirques seem to be present also in non-mountainous terrains that underwent extensive Pleistocene ice-sheet glaciations and strong glacial and fluvio-glacial erosion. The largest form in...
Conference Paper
Full-text available
Glacial climate changes over the last million years have influenced the distribution of oil and gas reserves, mainly in high latitude and arctic basins. Hydrocarbon exploration in the Norwegian part of the Barents Sea has been rather unsuccessful so far; numerous glaciations during the last 3 million years are regarded to be a major cause for this....
Poster
Full-text available
Fennoscandia has experienced major uplift in post-glacial time. The rate of uplift along the coasts is so high that its effects have been observed within one generation. In the northern Gulf of Bothnia the uplift is occurring at 9 mm/yr. The uplift has been intensely studied and discussed since the 18th century and it is now widely accepted to be a...
Chapter
Full-text available
Plio-Pleistocene erosion and sedimentation significantly impact postglacial uplift. We estimate in the last glacial cycle sedimentation could produce up to 155 m of subsidence and erosion 32 m of uplift. To show this we determine the changes in surface load caused by glacial and postglacial erosion and sedimentation over 1,000 year time intervals (...
Conference Paper
Full-text available
Plio-Pleistocene erosion was the dominant process in the shaping of numerous bedrock landforms of the Baltic Sea structural-denudational lowland, with significant input in its creation. However, pattern and rates of erosion are strongly variable, depending on glacial history, zonation, type of dominant process (abrasion, scouring, plucking, thrusti...
Conference Paper
The classical definition of eustasy is vertical movements of sea level, which were originally believed to be worldwide simultaneous uniform changes. However, changes in distribution of the Earth's mass bring about geoid changes, and sea level changes lead to significant subsidence of the ocean floor (hydro-isostasy) and uplift of the continents. Re...
Data
Geomorfological Map of Fennoscandia and Adjacent Areas 1998 , scale 1:3 mill. The map illustrated major bedrock landforms, origin and time of creation or transformation.
Data
Full-text available
Tectonic Map of the Baltic Shield and Adjacent Areas 1998, 1:5 mill scale illustrated major domains, structures, fault zones giving commonly used nomenclature of major elements and their age.
Article
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The Jotnian sandstones and Postjotnian diabases in the Satakunta and Bothnian Sea, Åland Sea and Lake Ladoga areas appear to belong together. The Jotnian sandstones are stratified and contain many types of primary structures, e.g. conglomerate interbeds and siltstone inclusions. Stratified structures in all the areas indicate quite a long period of...
Article
Full-text available
Latest events affecting the Precambrian basement, Gulf of Finland and surrounding areas. Geological Survey o f Finland, Special Paper 21, 115-125, 1 figure. Jotnian sedimentary rocks and Postjotnian mafic dykes and sills are regarded as the youngest basement rock types in the map area. Throughout the latest Meso-proterozoic and Neoproterozoic, ero...
Article
Full-text available
Subjotnian: Rapakivi granites and related rocks in the surround­ ings o f the Gulf of Finland. Geological Survey o f Finland, Special Paper 21, 59-97, 11 figures. The southern Finnish mainland, Aland, the Gulf of Finland and parts of neighbouring Latvia, Estonia and Russia are classical rapakivi areas. A typical rapakivi (adopted Finnish word meani...
Article
Full-text available
An attempt at qualitative and quantitative evaluation of the amount of Plio-Pleistocene erosion has been carried out for the whole Fennoscandian region. It is based on geological and geomorphological reconstructions with specification to the Mezo-Cenozoic surfaces. Transformed and dissected tablelands on the shield have been preliminarly correlated...
Article
Full-text available
Investigations by marine seismic and frequency counts of erratic boulders in and around the Aland Sea Basin and the Stockholm Archipelago indicate the presence of a thick sedimentary bedrock sequence in the Aland Sea Basin, с. 1,600 m in thickness. In the archipelago area, parts of this sedimentary bedrock sequence are assumed to be preserved in do...
Article
Cenozoic uplift and erosional processes, as well as subsequent extensive denudation by the Quaternary ice sheets played the main role in defining the modern appearance of the Baltic and Canadian shields. As a result of the Pleistocene exaration – erosional activity, glacioisostatic motions and isostatic uplifting, which compensated mass losses from...
Technical Report
Full-text available
Geological Map of the Baltic Sea bottom and adjacent land areas at a scale 1:500,000 is compiled first time (except the Bothnian Bay); legend contains geological periods, series and stages, tectonic framework and faults system is exposed. Explanatory note contains extended description of geology of the Baltic Sea region.
Article
Full-text available
Data are given on most conspicuous geologic and geomorphic anomalous features in the European North-West, including masses detached by glaciers; remnants of sedimentary cover removed considerably from areas of its continuous distribution; placanticlines; Paleozoic intrusive bodies. Most close attention is paid to ice-detached blocks and remnants of...
Article
Full-text available
The main methods and results of investigations of pre-Quaternary formations of the Gulf of Finland within the Baltic shield and the Russian platform are discussed. On the whole, the peneplanation surface of the Archaean - Early Proterozoic Crystalline basement is steeply inclined towards the south - southeast, where it is overlapped by platform dep...

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Projects

Projects (3)
Project
Enhance the understanding of the Earth´s rheology
Project
To estimate the magnitude of glacial erosion and glacial isostatic response, and assess their stress effects on faults and the implications for hydrocarbon migration