scholarly journals Integrated geological and geophysical study of the Tagil river valley morphology in its middle course

2021 ◽  
Vol 6 ◽  
pp. 24-31
Author(s):  
Aleksei V. Kuzin ◽  
Keyword(s):  
Physical Properties ◽  
River Valley ◽  
Valley Floor ◽  
Eastern Slope ◽  
The Urals ◽  
Fluvial Terrace ◽  
Fluvial Terraces ◽  
Geophysical Study ◽  
Sand And Gravel ◽  
Gravel Deposit

Relevance. Integrated geological and geophysical studies of a bridge in the Makhnevo village area are considered in the frame of the Urals eastern slope geology. Research objective is to study the lithology of the underlying part of the valley floor, determine soil physical and mechanical characteristics, and study a complex of fluvial terraces. Results. Relief elevations across the river valley have been studied, and four main fluvial terrace levels typical of the Urals eastern slope have been identified. An unstable section of the streambed with a canyonshaped valley above the neotectonic unwarping zone has been identified. The geological section of the river’s floodplain and streambed were studied based on geological and geophysical data. A change in the physical properties of glauconite sandstones and clays of Paleogene age in the recent underlying part of the river valley has been established. Layers of sand and glauconite sandstone that can be developed have been found at the new bridge site near the existing sand and gravel deposit. Conclusions. A complex of terraces of the Tagil river valley in its middle course is typical for the Urals eastern slope. The paleovalley is cut into a Paleogene glauconite sandstone layer. In the underlying part of the valley floor, changes in sandstones and clays physical properties have been recorded, and the presence of hypogene minerals was revealed. These are the signs of possible neotectonic processes in the series of the Cenozoic and Quaternary deposits.

Control of artesian pressure by bleeder wells

1979 ◽  
Vol 16 (3) ◽  
pp. 488-496 ◽  
Author(s):  
N. H. Wade ◽  
H. Taylor
Keyword(s):  
British Columbia ◽  
River Valley ◽  
Seasonal Peak ◽  
Clayey Silt ◽  
Artesian Aquifer ◽  
Sand And Gravel ◽  
Site Test ◽  
Gravel Aquifer

Deep test bleeder wells were installed in an artesian aquifer underlying the Bridge River No. 1 hydroelectric generating station in southern British Columbia to determine whether seasonal peak artesian pressures could be controlled.The Bridge River complex, built in the early 1950's, consists of two powerhouses located about a kilometre apart on the shore of Seton Lake, a system of power tunnels, and surface penstocks, which conduct water from the Carpenter Lake reservoir in Bridge River valley to the powerhouses. The No. 1 powerhouse is founded on consolidated deposits of clayey silt, underlain by sand and gravel. Shortly after the powerhouse was constructed, ground and powerhouse movements occurred. It was later determined that such movement was caused by high artesian pressures in the sand and gravel aquifer under the powerhouse.Attempts to install bleeder wells in 1952 were unsuccessful and an offshore fill was constructed as a toe weight, which functioned adequately until 1974 when additional ground cracking was observed. After further study and additional drilling at the site, test bleeder wells and piezometers were installed in 1976.Tests conducted to assess the effect of the bleeder wells indicated that control of excessive artesian pressures by a system of bleeder wells was feasible.

Late Quaternary paleoenvironments and growth of intrusive ice in eastern Beringia (Eagle River valley, northern Yukon, Canada)

2010 ◽  
Vol 47 (7) ◽  
pp. 941-955 ◽  
Author(s):  
Bernard Lauriol ◽  
Denis Lacelle ◽  
Mélanie St-Jean ◽  
Ian D. Clark ◽  
Grant D. Zazula
Keyword(s):  
Late Quaternary ◽  
Maximum Level ◽  
River Valley ◽  
Bison Bison ◽  
Glacial Lake ◽  
Silty Clay ◽  
Uneven Surface ◽  
Ground Ice ◽  
Fluvial Terrace ◽  
Cut Marks

In this study, the sediments exposed in a fluvial terrace and in the headwall of a thaw slump in the Eagle River valley, northern Yukon, provide new data about the timing of flooding of glacial Lake Old Crow, the formation of massive ground ice bodies, and the vegetation and the fauna in eastern Beringia during the late Quaternary. The stratigraphy and radiocarbon ages establish the following chronology of events: (1) a gravel fluvial terrace was deposited by an overflow from glacial Lake Hughes into glacial Lake Old Crow; (2) a carbonate silty clay was deposited during the maximum level of glacial Lake Old Crow at 15 120 14C year BP; (3) permafrost and large intrusive ice bodies aggraded through the glaciolacustrine and underlying sediments following the drainage of glacial Lake Old Crow from the site; (4) at 11 290 14C year BP, a shrub–sedge tundra colonized an uneven surface deformed by the bodies of ground ice; (5) a thaw lake drained at 6730 14C year BP after flooding the site; (6) during the early Holocene and from the previous major event onwards, material from the slope nearby the site buried the previous organic and inorganic sediment and the ice bodies; and (7) a bison (Bison) vertebra with conspicuous cut marks was dated to 12 210 ± 70 14C year BP. The age from the bison bone is amongst the most recent of the late Pleistocene bison specimens yet found in eastern Beringia.

Mineral resources of the Inner Hebrides

1983 ◽  
Vol 83 ◽  
pp. 611-625
Author(s):  
C. D. Gribble
Keyword(s):  
Mineral Resources ◽  
Iron Ores ◽  
Commercial Potential ◽  
Sand And Gravel ◽  
Gravel Deposit ◽  
Careful Assessment

SynopsisThe review examines the commercial potential of deposits of iron ores, lead, chromite, silica-rich rocks and diatomite that the Inner Hebrides possesses. Working quarries are described and their reserves estimated. Careful assessment of all the available data suggests that only the Raasay Ironstone, two diatomite deposits in Skye and an operating sand and gravel deposit at Allt Anavig in Skye merit further, detailed investigation.

Diachronism of river terrace formation? – Lessons to learn from luminescence dating results

2020 ◽  
Author(s):  
Thomas Kolb ◽  
Markus Fuchs ◽  
Ludwig Zöller
Keyword(s):  
Driving Forces ◽  
Luminescence Dating ◽  
River Terrace ◽  
Local Conditions ◽  
Fluvial Terrace ◽  
Sedimentary Characteristics ◽  
Fluvial Deposits ◽  
Fluvial Terraces ◽  
Geological Conditions ◽  
Wide Range

<p>Revealing an amazing diversity of forms, river systems have always to be interpreted as products of their specific landscapes. Extremely sensitive to external and internal forcing, they reflect the particular characteristics of climatological and geological conditions as well as the changes of these conditions. These changes are regularly preserved in depositional series whose varying sedimentary characteristics can be attributed either to palaeoclimatic variations or to tectonic activities and their corresponding changes in fluvial discharge and sediment load. What applies to fluvial sediments in general, is particularly true for river terraces. Regularly, they are regarded as valuable palaeoenvironmental and archaeological archives and their particular importance is well documented by a huge and still growing number of studies spanning a wide range of climatic and regional settings.</p><p>However, the information gained from fluvial terraces and their significance for palaeoenvironmental and present-day fluvial research strongly depend on an accurate and precise dating of the terrace formation. Numerical ages are of fundamental importance for the interpretation of sedimentological, morphological and stratigraphical findings. They are essential for assessing the influence of various driving forces and for providing insights into the mechanisms and dynamics of river adjustments over variable temporal scales.</p><p>In this contribution, we present luminescence ages of fluvial deposits originating from an Upper Pleistocene river terrace in a small valley located in the headwater of the Main River, Germany. For this study, several samples from various locations throughout the river longitudinal course have been analysed. Surprisingly, the determined luminescence ages for material from the lowermost part of the valley are significantly older than those from the middle section, which in turn are older than those from the valley’s upper reaches. Based on the evaluation of a high-resolution digital elevation model (DEM) and on intensive fieldwork, we can be sure that all samples originate from the very same morphological unit, a well-preserved late Pleistocene fluvial terrace.</p><p>Our results suggest a diachronic alignment of sedimentation ages for fluvial deposits, starting with old ages close to the mouth of a river and getting progressively younger for locations approaching the upper reaches. If these findings are confirmed in other fluvial systems and are not only the result of very specific local conditions, they will be of great relevance for geomorphological research in fluvial landscapes. As a result, the widespread approach of deriving age estimates for fluvial terraces from numerical results merely determined for a single location appears to be inadequate and should be subjected to a critical review.</p>

Numerical age dating of Danube terraces from one fault block (Rauchenwarth) west of the Vienna Basin Transform Fault (Austria)

2020 ◽  
Author(s):  
Stephanie Neuhuber ◽  
Zsófia Ruszkiczay-Rüdiger ◽  
Christopher Lüthgens ◽  
Philip Martin ◽  
Bernhard Salcher ◽  
...  
Keyword(s):  
Danube River ◽  
Age Dating ◽  
Fault System ◽  
Transform Fault ◽  
Vienna Basin ◽  
Fluvial Terrace ◽  
Fluvial Terraces ◽  
Fault Block ◽  
River Bed ◽  
Upper Level

<p>Fluvial terraces within the extensional structure of the Vienna Basin have been dissected by faults related to the sinistral movement of the Vienna Basin Transform Fault System (VBTF, Decker et al., 2005). Each fault block within the basin displays a slightly different succession of terraces regarding their number, elevation, and preservation. Generally, altitudes of terrace bases within the Vienna Basin vary between 5 and 130 m above the recent Danube river bed.</p><p>This study focuses on one clearly confined fault block, the Rauchenwarth Plateau, located south of the Danube. The plateau forms the western part of intra-basinal hills crossing the Vienna Basin and consists mainly of Miocene sediments that are in part covered by quaternary fluvial terrace deposits at different elevations. The entire succession is widely covered by loess or re-deposited aeolian sediments. To depict the formations below the loess cover we use 19 wells to construct three sections crossing the eastern part of the block in E-W and two parallel sections in N-S direction. The sections show that three levels of fluvial terraces at the northern eastern side of the block are preserved. The lowest and highest levels are accessible in gravel pits with well-defined Miocene bases. These two levels with terrace bases ~67 m and ~24 m above the recent Danube contain large quartz cobbles suitable for dating using in-situ produced <sup>26</sup>Al and <sup>10</sup>Be. Sample sets were taken at 11 m (higher terrace) and 14 m (lower terrace) below todays surface. Sandy sediments from the lower level were in addition dated by luminescence on feldspar using the pIRIR 225 signal. Age calculations using the isochron method (Balco and Rovey, 2008) as well as inverse modelling for the upper level suggest burial durations of ~1.2 Ma. Results of age calculations using cosmogenic nuclides as well as luminescence ages for the lower level will be presented at the conference.</p><p><em>Thanks to NKFIH 124807; OMAA 90öu17, the INSU/CNRS, the ANR through the program “EQUIPEX Investissement d’Avenir” and IRD</em></p><p><strong>References </strong></p><p>Balco, G., Rovey, C., 2008. Am. J. of Science 308, 1083-1114.</p><p>Decker, K., et al., 2005. Quat. Sci. Rev. 24, 305-320.</p>

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