The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Victor D. Mats - One of the best experts on this subject based on the ideXlab platform.
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The structure and development of the Baikal rift depression
Earth-Science Reviews, 1993Co-Authors: Victor D. MatsAbstract:Abstract The Baikal rift depression, located in southeastern Siberia, is one of the best investigated intra-continental rift structures in the world. In addition to being the site of comprehensive studies by Russian geo-scientists for decades, the Baikal depression is now the subject of new international investigations using advanced technical means and technologies. The present paper summarizes the principal results concerning the Morphostructure of the Baikal rift, the stratigraphy of the Cenozoic deposits and the stages of the Baikal depression development. Based on cross-sections which exhibit the impact of both tectonic and climatic processes, the development of the Baikal depression occurred through two stages: (i) the pre(crypto)-rift stage of the Late Cretaceous-Eocene and (ii) active rifting of the Oligocene-Recent. The second stage is divided into several steps and substeps separated by tectonic phases. Formation of the Baikal rift zone appears to be related to the Indo-Eurasian plate collision related to a model of passive rifting. The uplifted shoulders of the depression have a complex Morphostructure overlain by Cenozoic deposits which are thin and restricted in area. The near-marginal zones of the rift are largely defined by the system of longitudinal blocks of different width. Surfaces of the blocks are inclined either to the uplifted shoulder of the rift bound by listric faults typical for western edges of the depression or to the axis of the depression. Cenozoic deposits on the blocks consist of accumulative plains composed primarily of thick lacustrine sequences.
Marc Fournier - One of the best experts on this subject based on the ideXlab platform.
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Geodynamic environment of Quaternary Morphostructures of the subandean foreland basins of Peru and Bolivia: Characteristics and study methods
Quaternary International, 1994Co-Authors: Jean-françois Dumont, Marc FournierAbstract:Abstract The Quaternary evolution of western Amazon basins is considered using morphostructural analysis of fluvial belts and lakes. Meandering rivers from the basin surface are analyzed using three scales of elements: the ridge and swale pattern, the mosaic pattern and the fluvial belt. Lake patterns are differentiated according to their shape, the hydrological environment and the structural context. Influences of basement structures and neotectonic deformations, when known, are considered. The morphostructural patterns are discussed in the context of a balance of internal (tectonic) and external (hydraulic and sedimentologic) processes. Special attention is focussed on the effect of neotectonics, which is generally neglected, on the formation and the location of Quaternary Morphostructures. The adaptation of study methods and sampling to the characteristics of the different Morphostructures is considered.
V. V. Butsenko - One of the best experts on this subject based on the ideXlab platform.
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The rises of the Amerasia basin, arctic ocean, and possible equivalents in the Atlantic ocean
Океанология, 2019Co-Authors: V. A. Poselov, V. V. Verba, S. M. Zholondz, V. V. ButsenkoAbstract:Main positive Morphostructures of the Amerasia Basin, the Lomonosov Ridge, Alpha Ridge, Mendeleev Rise, Chukchi Plateau and Northwind Ridge, have been considered from geomorphological, geological and geophysical aspects. Time and Depth seismic sections have been provided up to the Moho discontinuity from the Lomonosov Ridge and its junction with the Greenland and East-Siberian shelves. Time and Depth seismic sections of the Mendeleev-Alpha rises and Chukchi Plateau are presented too. The sections were set up based on seismic surveys: deep seismic sounding and multichannel seismic reflection. Some similarities have been reflected for the foregoing land structure depth sections and typical sections of the continental crust. Brief geological and geophysical data have been presented for the positive Morphostructures of the Atlantic Ocean such as the Rockall and Vring plateaus, the continental nature of which is established beyond all doubt. Genesis of positive Morphostructures in the northern Atlantic Ocean and the Arctic Ocean has been connected with processes of continental rifting and concomitant intraplate magmatism.
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Rises of the Amerasia Basin, Arctic Ocean, and Possible Equivalents in the Atlantic Ocean
Oceanology, 2019Co-Authors: V. A. Poselov, V. V. Verba, S. M. Zholondz, V. V. ButsenkoAbstract:Main positive Morphostructures of the Amerasia Basin, the Lomonosov Ridge, Alpha Ridge, Mendeleev Rise, Chukchi Plateau and Northwind Ridge, have been considered from geomorphological, geological and geophysical aspects. Time and Depth seismic sections have been provided up to the Moho discontinuity from the Lomonosov Ridge and its junction with the Greenland and East-Siberian shelves. Time and Depth seismic sections of the Mendeleev-Alpha rises and Chukchi Plateau are presented too. The sections were set up based on seismic surveys: deep seismic sounding and multichannel seismic reflection. Some similarities have been reflected for the foregoing land structure depth sections and typical sections of the continental crust. Brief geological and geophysical data have been presented for the positive Morphostructures of the Atlantic Ocean such as the Rockall and Voring plateaus, the continental nature of which is established beyond all doubt. Genesis of positive Morphostructures in the northern Atlantic Ocean and the Arctic Ocean has been connected with processes of continental rifting and concomitant intraplate magmatism.
Yaroslav Kravchuk - One of the best experts on this subject based on the ideXlab platform.
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GEOLOGICAL-GEOMORPHOLOGICAL ANALYSIS OF NATIONAL NATURAL PARKS OF THE NORTH-WESTERN PART OF THE UKRAINIAN CARPATHIANS
PROBLEMS OF GEOMORPHOLOGY AND PALEOGEOGRAPHY OF THE UKRANIAN CARPATHIANS AND ADJACENT AREAS, 2021Co-Authors: Yaroslav Kravchuk, Vitaliy BrusakAbstract:In the stydy an analysis of the geological structure and relief of Uzhansky, “Skolivsky Beskydy”, and “Boykivshchyna” national natural parks (NNP), located in the north-western part of the Ukrainian Carpathians, is presented. Uzhansky NNP is located within the Polonynsko-Chornohirska and Vododilno-Verkhovyna geomorphological regions, “Skolivski Beskydy” NNP is situated in the Skibovy Carpathians, and the newly created “Boykivshchyna” NNP is located within the Vododilno-Verkhovyna and Skybovi Carpathians. The analysis of the Morphostructure and morphosculpture of national parks is carried out taking into account the longitudinal (N-W–S-E) and transverse divisions of the Ukrainian Carpathians. The longitudinal division is associated with higher Morphostructures of higher orders – the second and third, with the transverse is associated with the fourth and fifth Morphostructures. In the analysis of morphosculpture of national parks, the types which are characteristic of the Carpathian Flysch belt are allocated. All mountain ranges and ridges are characterized by an asymmetrical structure – steep northeastern slopes and declivous southwestern slopes. The relic morphosculpture is represented by: 1) fragments of denudation surfaces of different ages such as Beskid, Pidbeskid, and riparian; 2) extra glacial and firn glaciations; 3) areas of ancient longitudinal valleys. Inherited morphosculpture is represented by river valleys with a complex of terraces of different ages. Modern morphodynamic processes represent by height (tier) differentiation. In the tiers of strongly dissected mid-mountain and low-mountain relief, the processes of planar erosion, deflux, and linear erosion play an important role in the modeling of the relief. The lower tier of the terraced and non-terraced bottoms of the valleys are associated with the processes of leaching and erosion as well as a significant accumulation of erosion products and mudflows. Among gravitational processes and block motions, stabilized and active displacements are the most recorded. Keywords: National natural park; Ukrainian Carpathians; relief; Morphostructure; morphosculpture.
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General features of relief of Marmaroshi and Pieniny rocks of Ukrainian Carpathians and their place under system of geomorphological regionalization
Visnyk of the Lviv University. Series Geography, 2013Co-Authors: Yaroslav Kravchuk, Roman Hnatiuk, Myroslav Ivanyk, Yaroslav KhomynAbstract:Peculiarities of geological structure and relief of Ukrainian fragment of zones of Marmaroshi and Pieniny rocks located between Outer (Flysch) and Inner Carpathians are considered. Morphostructural differences and common features of relief of these zones are clarified. Territory of zones of Marmaroshi and Pieniny rocks is considered as separate geomorphological region of mountain part of Ukrainian Carpathians – subregion of Intermountain Valleys and Rocky Chains. Expediency of separation and taxonomic class of this geomorphological region are proved, its division into taxonomic units of lower class is realized. Key words: Marmaroshi rocks, Pieniny rocks, klippes (limestone rocks of Jurassic period), Morphostructure, geomorphological regionalization, Ukrainian Carpathians.
Gebra Team - One of the best experts on this subject based on the ideXlab platform.
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Morphostructure and evolution of the Central and Eastern Bransfield Basins (NW Antarctic Peninsula)
Marine Geophysical Researches, 1996Co-Authors: Eulàlia Gràcia, Miquel Canals, Marcel-lí Farran, María J. Prieto, J. Sorribas, Gebra TeamAbstract:The Bransfield Basin is a narrow and elongated active rift basin located between the Antarctic Peninsula and the South Shetland Islands. The Bransfield Basin is composed of three small basins, and two of them, the Central and Eastern Bransfield Basins, were surveyed during a recent cruise (GEBRA 93). The full swath bathymetry coverage as well as the single-channel seismic reflection and magnetic profiles that have been acquired, help us to better understand the Morphostructure and recent evolution of the Bransfield Basin. Six large volcanic edifices aligned with the basin axis stick out of the sedimented seafloor of the Central Bransfield Basin. In contrast, the Eastern Bransfield Basin is characterised by four deep troughs displaying a rhombic-shape, and small, scattered volcanic cones located in the southwestern half basin. Seamount volcanism plays an important role in the formation of new crust in the Bransfield Basin. The larger seamounts of the Central Bransfield Basin are located at the intersection of the two main orthogonal sets of faults (longitudinal ENE-WSW and transversal NNW-SSE). Morphological analysis of the seamounts indicates a multi-staged volcano-tectonic construction. The distribution and shape of these edifices suggests that both volcanism and extension are concentrated at the same preferential areas through time. This might be related to the fracturation style of the continental crust. The Central and Eastern Bransfield Basins are very different in Morphostructure, volcanism, and sedimentary cover. The Central Bransfield Basin shows evidence of NW-SE extensional faulting and focused active MORB-volcanism interpreted as result of incipient seafloor spreading. The Eastern Bransfield Basin is still in a rifting stage, mainly dominated by a NW-SE extension and some left-lateral strike-slip component probably related to the South Scotia Ridge.