PROBLEMS OF DIFFERENTIATION AND CORRELATION OF ALLUVIAL DEPOSITS OF THE NEO-PLEISTOCENE IN THE LOWER OB REGION

2021 ◽  
pp. 18-27
Author(s):  
I. D. Zolnikov ◽  
◽  
A. A. Anoykin ◽  
A. V. Postnov ◽  
A. V. Vybornov ◽  
...  
Keyword(s):  
River Sediments ◽  
Flood Plain ◽  
Middle Pleistocene ◽  
Interglacial Period ◽  
Pleistocene Glaciation ◽  
Pleistocene Glaciations ◽  
Alluvial Deposits ◽  
Glacier Ice

The Upper Neo-Pleistocene alluvial deposits lie in a close hypsometric position in outcrops of the Lower Ob Region right bank. Their top usually does not rise above the level of 5 m above the tow-path edge. At the same level, glacial erratic masses of the Middle Pleistocene alluvium were recorded in a number of areas. The height of the 1st and 2nd sites of terraces (on average from 5 to 10–15 m) depends on the thickness of subaerial deposits overlapping the alluvium. The 3rd terrace above flood-plain of the Bolshaya (Big) Ob has no geomorphological expression, since the alluvium of the first Late Neo-Pleistocene interglacial period without ablation is drape overlain by parallely bedded precipitates of the glacier-ice-blocked lake of the first Late Neo-Pleistocene glaciation. Thus, the height of sites of terraced surfaces does not directly correlate with the age of their alluvial basement. Therefore, the geomorphological method for differentiation of river sediments is not effective for this region. In addition, the problems of differentiation and correlation of alluvial deposits of the Lower Ob Region right bank are complicated by the presence of fluvioglacial incisions of deglaciation stages of the Middle Neo-Pleistocene and Upper Neo-Pleistocene glaciations.

scholarly journals Concerning the Microdiamonds and Cosmic Spherules from Middle Pleistocene Selenge River Basin in North Mongolia

2017 ◽  
Vol 1 (1) ◽  
Keyword(s):  
River Basin ◽  
Practical Interest ◽  
Flood Plain ◽  
Middle Pleistocene ◽  
Alluvial Deposits ◽  
The North ◽  
River Terraces ◽  
Cosmic Spherules ◽  
Alluvial Terraces ◽  
North And South

This paper concerns deals with new discovery of microdiamonds and cosmic spherules from Middle Pleistocene Selenge river basin by the example of the Teel and Khukh Ereg terrace alluvial terraces. The Teel and Khukh Ereg alluvial terraces are located at the north and south edges of the Selenge river (Fig.1), at the base of mountain Namnan uul (Fig.2). These terraces are those whose cusp and bench entirely composed of alluvial sediments of Middle Pleistocene age [1]. This indicates that the Selenge river has a long history of development, had time to develop a flood plain and to deposit alluvium, through which it cut subsequently and north and south behind as a Teel and Khukh Ereg terraces [2]. Alluvium studies may be of great practical interest because in some areas, river terraces are veritable treasure-troves of economic minerals. With river terraces are associated most placer deposits of such important economic minerals as gold, platinum, diamond, etc. Numerous engineering projects, an example, bridges (Kherlen, Tuul, Selenge, Orkhon, Baidrag, Tui, Zavkhan, Delger Muren, etc.), dams and hydropower plants (Durgun Nuur, Ulaan Boom) are built on alluvial deposits. Hence the need to know all the essential features of the geostructure of river terraces. Just our investigation of the Selenge river terraces in 2006-2010 and 2014 gave possibility to discover the placer diamonds within the Teel and Khukh Ereg alluvial terraces for the first time in Mongolia [3,4].

scholarly journals Plio-Quaternary history of the Turkish coastal zone of the Enez-Evros Delta: NE Aegean Sea

2001 ◽  
Vol 2 (2) ◽  
pp. 95 ◽  
Author(s):  
B. ALPAR
Keyword(s):  
Late Pleistocene ◽  
Sand Dunes ◽  
Aegean Sea ◽  
Interglacial Period ◽  
Shelf Area ◽  
Sea Level Changes ◽  
Seismic Profiles ◽  
Alluvial Deposits ◽  
History Of ◽  
Quaternary History

The Enez-Evros Delta, NE Aegean Sea, is located in one the most important wetlands in the world with its sandy offshore islands, abandoned channel mouths, sand-dunes, shoals, marshlands, saline lagoons and saltpans. It comprises very well developed sedimentary units and a prodelta lying on an older submarine delta. The present day elevations of the middle-late Pleistocene marine terraces indicate a regional tectonic uplift in the area. Due to lack of geophysical and bore hole data and partly due to its strategic position, the structural and stratigraphic features of the submarine extension of the delta are not known in detail. In this paper, Plio-Quaternary history of this delta and its submarine part on the Turkish shelf was explored by using high-resolution shallow reflection seismic profiles. The delta is formed by the alluvial deposits of the Enez-Evros River and shaped by their interaction with the sea. It takes place in front of a large and protected ancient bay which was filled rapidly over millennia. The sediments in the plateau off the river are principally pro-deltaic with muddy areas near the river mouths changing to muddy sand further out. The sea-level changes in Plio-Quaternary were characterised by three different seismic stratigraphic units on the folded Miocene limestone basement. In the late Pleistocene, the shelf area over an Upper Miocene basement was flooded during the Riss-Würm interglacial period, exposed in the Würm glacial stage, and flooded once again during the Holocene transgression.

scholarly journals Innovative strategies for high resolution site characterization: application to a flood plain

2014 ◽  
Vol 3 (4) ◽  
Author(s):  
Thomas Vienken ◽  
Manuel Kreck ◽  
Jörg Hausmann ◽  
Ulrike Werban ◽  
Peter Dietrich
Keyword(s):  
Hydraulic Properties ◽  
Test Site ◽  
Flood Plain ◽  
Site Characterization ◽  
Geological Structure ◽  
Small Scale ◽  
Alluvial Deposits ◽  
Innovative Strategies ◽  
Sedimentary Deposits

Solving complex hydrogeological problems often requires a thorough understanding of (hydro-) geological subsurface conditions. This is especially true for sedimentary deposits with complex architecture, where lithology and/or hydraulic properties can significantly vary over short horizontal and vertical distances. At these sites, a traditional, solely sample-based investigation approach is often not applicable due to limited data accuracy, resolution, and efficiency. Instead, an adapted investigation approach is required that combines exploration technologies of different resolution and investigation scales. This paper aims to demonstrate the feasibility of such a multi-scale approach for the characterization of a test site near the city of Löbnitz, Germany, that is comprised of heterogeneous alluvial deposits. Our focus is on site characterization in terms of lithology and hydraulic properties, as well as on the delineation and characterization of an aggradated oxbow as a typical example of a small scale geological structure.

scholarly journals Early and middle Pleistocene glaciation of the southern Patagonian plain

2021 ◽  
pp. 103687
Author(s):  
Corinne Y. Griffing ◽  
John J. Clague ◽  
Rene W. Barendregt ◽  
Bettina Ercolano ◽  
Hugo Corbella ◽  
...  
Keyword(s):  
Middle Pleistocene ◽  
Pleistocene Glaciation

scholarly journals SOLONSKE SECTION AND THE PERSPECTIVES OF THE STUDY OF PLEISTOCENE CARPATHIAN FORELAND

2019 ◽  
pp. 73-100
Author(s):  
Roman Hnatiuk ◽  
Igor Papish
Keyword(s):  
Field Study ◽  
Key Words ◽  
Middle Pleistocene ◽  
Buried Soils ◽  
Iron Compounds ◽  
Main Attention ◽  
Alluvial Deposits ◽  
River Terraces ◽  
The Village ◽  
Made In

The article presents the results of the field study of the two artificial outcrops of the Pleistocene deposits, which are located in the suburbs Solonske near Drohobych city. Outcrops (careers) are located within the terrace of the Tysmenytsia River. The height of the terrace is about 50 m above the river level and changes along the distance from the mountains. The main attention in the article is paid to the study of the structure of the upper (covering) stratum of the terrace with a thickness of about 26 m, and also to the characteristics of its consolidated stratigraphic section. The basis of this stratum consists of the layers of non-carbonate loams and clays. They are more or less enriched of iron compounds and gleyed. Between them there are four horizons of buried soils of the interglacial and interstadial rank. Based on the observations made in the field, it was found that the sediments of the covering stratum have mainly river origin. The conditions of their accumulation, as well as the conditions for the formation and transformation of ancient soils, are considered; eight pre-Holocene lito- and pedostratigraphic layers of different rank are singled out. The division of the covering stratum of the terraces into three main layers is sub¬stan¬tiated, which is equivalent to the stratigraphic units of the glacial and interglacial rank. Comparison of the Solonske section with other sections of the similar height terraces, in particular with well-known outcrops near the village Dubrivka (section Dubrivka) gives grounds to assume that the formation of a local terrace occurred during the Marine Isotopic Stages 12 to 10. Consequently, the Solonske section represents a short strati¬gra¬phic interval of the Middle Pleistocene (not the three main Pleistocene units as stated in the results of its previous study). It can be the basis for studying only a few (two to three) horizons of the glacial/interglacial rank. At the same time, it is potentially a very impor¬tant key section of the Solonske (Dubrivska, Dovhivska, Varnytska) terrace of the Pre-Dniester. The studying of Solonske outcrops makes it necessary to revise the popular notions about the origin and the age of the so-called covering stratum of the river terraces of the Carpathian Foreland and Podolian Pre-Dniester, its stratigraphic filling and significance. Key words: alluvial deposits; terraces; soil-loess sequence; Middle Pleistocene; Dniester valley; Carpathian Foreland; Solonske section.

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