Late Weichselian ice-sheet flow directions in the Russian northern Barents Sea from high-resolution imagery of submarine glacial landforms

Geology ◽  
2021 ◽  
Author(s):  
Julian A. Dowdeswell ◽  
Aleksandr Montelli ◽  
Grigorii Akhmanov ◽  
Marina Solovyeva ◽  
Yana Terekhina ◽  
...  
Keyword(s):  
Barents Sea ◽  
Late Quaternary ◽  
Ice Flow ◽  
Novaya Zemlya ◽  
Franz Josef Land ◽  
High Resolution Imagery ◽  
Anna Trough ◽  
Flow Convergence ◽  
Late Weichselian ◽  
Glacial Landforms

The locations and orientations of more than 1000 late Quaternary subglacial and ice-marginal landforms, including streamlined sedimentary bed forms, glacitectonic hill-hole pairs, meltwater channels, and eskers, were mapped from blocks of multibeam data (area of 4861 km2) in the little-known Russian Barents Sea. Between Sentralbanken and Admiralty Bank, at ~75°N, there is evidence for southward ice flow. Ice-flow indicators between Franz Josef Land and Novaya Zemlya show northeast flow into the head of St. Anna Trough. There is also evidence of southeast flow off the bank to the south of Franz Josef Land, and of flow convergence with northeast-flowing ice in Sedov Trough. Northeast flow of ice between Novaya Zemlya and Franz Josef Land suggests that the latter archipelago was not overrun by ice flowing north from the Barents Sea and, therefore, that a subsidiary ice dome was likely on Franz Josef Land. A major ice divide was also present at ~76°N –77°N in the Russian Barents Sea.

scholarly journals Isostatic uplift in the late Weichselian Barents Sea: implications for ice-sheet growth

1996 ◽  
Vol 23 ◽  
pp. 352-358 ◽  
Author(s):  
M. J. Siegert ◽  
W. Fjeldskaar
Keyword(s):  
Barents Sea ◽  
Ice Sheet ◽  
Time Dependent ◽  
Earth Model ◽  
Novaya Zemlya ◽  
Isostatic Uplift ◽  
Franz Josef Land ◽  
Geological Information ◽  
Ice Loads ◽  
Late Weichselian

Results from a recent time-dependent ice-sheet modelling study of the late Weichselian Svalbard—Barents Sea ice sheet suggest that, under environmental conditions representative of those during the late Weichselian, ice derived solely from Svalbard may have occupied only the relatively shallow (<300 m water depth) northwestern Barents Sea, with other deeper regions remaining free of grounded ice (Siegert and Dowdeswell, 1995a). However, late Weichselian geological information from the 400 m deep Bjørnøyrenna (southern Barents Sea) indicates that grounded ice was present in an area modelled by Siegert and Dowdeswell (1995a) as free of ice (e.g. Laberg and Vorren, in press a). Isostatic uplift of the central Barents Sea may have reduced the relative sea level and hence provided a mechanism by which grounded ice could have migrated from relatively shallow regions of the Barents Sea into, previous to uplift, deeper water. We have used an isostatic Earth model to determine the geometry of an isostatic forebulge within the late Weichselian Barents Sea, caused by ice loads over Svalbard, Franz Josef Land, Novaya Zemlya and Fennoscandia. These data were then used as input to a time-dependent glaciological model, in order to predict further information about the magnitude of bedrock uplift required to allow grounded ice to flow from Svalbard into the central and southern Barents Sea. Our experiments suggest that grounded ice, originating from Svalbard, is able to form over Sentralbanken, providing that at least 60 m of uplift is achieved in the central Barents Sea. Grounded ice within Bjørnøyrenna was only predicted when the amplitude of the local forebulge exceeded 250 m.

scholarly journals Isostatic uplift in the late Weichselian Barents Sea: implications for ice-sheet growth

1996 ◽  
Vol 23 ◽  
pp. 352-358
Author(s):  
M. J. Siegert ◽  
W. Fjeldskaar
Keyword(s):  
Barents Sea ◽  
Ice Sheet ◽  
Time Dependent ◽  
Earth Model ◽  
Novaya Zemlya ◽  
Isostatic Uplift ◽  
Franz Josef Land ◽  
Geological Information ◽  
Ice Loads ◽  
Late Weichselian

Results from a recent time-dependent ice-sheet modelling study of the late Weichselian Svalbard—Barents Sea ice sheet suggest that, under environmental conditions representative of those during the late Weichselian, ice derived solely from Svalbard may have occupied only the relatively shallow (<300 m water depth) northwestern Barents Sea, with other deeper regions remaining free of grounded ice (Siegert and Dowdeswell, 1995a). However, late Weichselian geological information from the 400 m deep Bjørnøyrenna (southern Barents Sea) indicates that grounded ice was present in an area modelled by Siegert and Dowdeswell (1995a) as free of ice (e.g. Laberg and Vorren, in press a). Isostatic uplift of the central Barents Sea may have reduced the relative sea level and hence provided a mechanism by which grounded ice could have migrated from relatively shallow regions of the Barents Sea into, previous to uplift, deeper water. We have used an isostatic Earth model to determine the geometry of an isostatic forebulge within the late Weichselian Barents Sea, caused by ice loads over Svalbard, Franz Josef Land, Novaya Zemlya and Fennoscandia. These data were then used as input to a time-dependent glaciological model, in order to predict further information about the magnitude of bedrock uplift required to allow grounded ice to flow from Svalbard into the central and southern Barents Sea. Our experiments suggest that grounded ice, originating from Svalbard, is able to form over Sentralbanken, providing that at least 60 m of uplift is achieved in the central Barents Sea. Grounded ice within Bjørnøyrenna was only predicted when the amplitude of the local forebulge exceeded 250 m.

Co, Hf, Ce, Cr, Th, and REE systematics of modern bottom sediments of the Barents sea

2019 ◽  
Vol 485 (2) ◽  
pp. 207-211
Author(s):  
A. V. Maslov ◽  
N. V. Politova ◽  
V. P. Shevchenko ◽  
N. V. Kozina ◽  
A. N. Novigatsk ◽  
...  
Keyword(s):  
Bottom Sediments ◽  
Barents Sea ◽  
Western Coast ◽  
Novaya Zemlya ◽  
The North ◽  
The Barents Sea ◽  
Franz Josef Land ◽  
Pechora River ◽  
Marine Areas ◽  
Bottom Grab

The Co, Hf, Ce, Cr, Th, and REE systematics are analyzed for modern sediments collected by a bottom grab during the 67th and 68th cruises of R/V “Akademik Mstislav Keldysh” and samples taken in the Barents Sea bays and inlets. Our results indicate that most modern bottom sediments are composed of fine silicoclastic material enhanced with a suspended matter of the North Cape current, which erodes the western coast of Scandinavia, and due to bottom erosion of some marine areas, as well as erosion of rock complexes of the Kola Peninsula, Novaya Zemlya, and Franz Josef Land (local provenances). Material from Spitsbergen also probably played a certain role. In the southern part of the Barents Sea, clastic material is supplied by the Pechora River.

Rare and trace elements in modern bottom sediments of the Barents sea. Nd, Pb and Sr isotopic composition

2021 ◽  
pp. 444-472
Author(s):  
A.V. Maslov ◽  
◽  
N.V. Politova ◽  
N.V. Kozina ◽  
A.B. Kuznetzov ◽  
...  
Keyword(s):  
Bottom Sediments ◽  
Surface Sediments ◽  
Barents Sea ◽  
Positive Correlation ◽  
Novaya Zemlya ◽  
The North ◽  
The Barents Sea ◽  
Franz Josef Land ◽  
Central Regions ◽  
Moderate Positive Correlation

The article presents a brief lithological description of the modern bottom sediments of the Barents Sea, selected in the 67th voyage of the R/V “Akademik Mstislav Keldysh” at the polygons: 1) “Pechora Sea”; 2) “Western slope of Kaninskoe shoal”; 3) “Central Barents Sea (Shtokman area)”; 4) “Russkaya Gavan’ fjord”; 5) “Medvezhinsky Trench”; 6) in the area to the south of Spitsbergen; 7) “Kola meridian”; 8) “Spitsbergen – Franz Josef Land archipelago”; 9) “Cambridge Strait”. The distribution of Cr, Ni, Cu, Zn, Cd, and Pb in samples of bottom sediments (pelitic, aleurite-pelitic and sandy-aleuritic-pelitic ooze) is compared with the background concentrations and contents of these elements in the Post-Archean Average Shale (PAAS). The data obtained are consistent with the notion that the distribution of heavy metals and other elements in the bottom sediments is controlled primarily by the global geochemical background. The relationship of the Sc, V, Cr, Ni, Y, Zr, Nb, Mo, Hf, Th, U and rare-earth elements concentrations with content of fine pelite (< 0.001 mm) fraction and organic carbon (Corg) is considered. It was found that most of these elements are characterized by a moderate positive correlation with the amount of fine pelite fraction in samples. By the magnitude of the correlation coefficient with the Corg content, all elements are attributed into three groups: (1) with moderate positive correlation, (2) weak positive correlation, (3) practically not pronounced correlation. The distribution in the bottom sediments of the Barents Sea of the element-indicators of the source rocks composition (Sc, Th, Co, Cr, La and Sm), as well as of rare earths, make it possible to consider that the majority of bottom sediments is mature in geochemical terms material, the sources of which were rocks of the Kola Peninsula and Spitsbergen (?). The bottom sediments of the Cambridge Strait are represented by geochemically less mature material, which, apparently, entered the sea as a result of erosion of the Franz Josef Land archipelago rocks. The established isotopic characteristics (εNd, 207Pb/206Pb and 87Sr/86Sr) of 17 samples of surface sediments suggest that the main contribution to the formation of bottom deposits of the central regions of the Barents Sea is made by rocks of the mainland part located in the influence zone of the North Cape Current. Archipelagos and islands (Franz Josef Land, Novaya Zemlya, etc.) that frame the Barents Sea supply a relatively small amount of clastic material that is carried by Arctic currents. The values of εNd and 87Sr/86Sr in the surface sediments of the central part of the Barents Sea and in the ice-rafted sediments carried by the Transpolar Drift showed a significant difference. This suggests that the contribution of such material to the formation of surface sediments of the Barents Sea is relatively small

scholarly journals Ice gouging on the arctic shelf of Russia

2019 ◽  
Vol 59 (3) ◽  
pp. 466-468
Author(s):  
S. L. Nikiforov ◽  
R. A. Ananiev ◽  
N. V. Libina ◽  
N. N. Dmitrevskiy ◽  
L. I. Lobkovskii
Keyword(s):  
Deep Water ◽  
Barents Sea ◽  
The Arctic ◽  
Natural Phenomena ◽  
Novaya Zemlya ◽  
The Barents Sea ◽  
Franz Josef Land ◽  
Eastern Shelf ◽  
Almost All ◽  
Perennial Ice

The results of recent geological and geophysical expeditions indicate the activation of hazardous natural phenomena associated with ice gouging and represent geohazard for almost all activities, including operation of the Northern Sea Route. Within the Barents Sea and the western part of the Kara Sea, the modern ice gouging is mainly associated with icebergs which are formed as a result of the destruction of the glaciers of Novaya Zemlya, the Spitsbergen archipelago and Franz Josef Land, while on the eastern shelf it is caused by the destruction of seasonal or perennial ice fields. Fixed furrows can be divided into modern coastal gouges or deep water ploughmarks. All deep water gouges within the periglacial and glacial shelf are of paleogeographical origin, but with different mechanisms of action on the seabed. These furrows were formed by floating ice on the periglacial shelf. On the glacial shelf deep water ploughmarks were formed by large icebergs, which could carry out the gouging even on the continental slope and deep-sea ridges of the Arctic Ocean.

scholarly journals Polychaete genus Pholoe (Polychaeta: Pholoidae) in the north-east region of the Barents Sea

2021 ◽  
Vol 12 (3-2021) ◽  
pp. 88-97
Author(s):  
K.K. Moskvin ◽  
Keyword(s):  
Barents Sea ◽  
Size Structure ◽  
Novaya Zemlya Archipelago ◽  
North West ◽  
Novaya Zemlya ◽  
North East ◽  
The North ◽  
East Region ◽  
The Barents Sea ◽  
Franz Josef Land

The paper describes species composition, distribution and biology of the polychaeta genus Pholoe in the north-east region of the Barents Sea (between Franz Josef Land and north-west coast of Novaya Zemlya archipelago). One species of the genu s was identified based on the reviewed morphological descriptions – Pholoe assimilis. The highest values of population density (1130 specimens/m2) and biomass (570 mg/m2) were registered in comparatively warm coastal waters of Novaya Zemlya archipelago. Pholoe assimilis’ population size structure based on the dorsal width of the fifth chaetiger was investigated for the first time. Size-frequency histograms indicate presence of at least four size classes.

scholarly journals Threefold increase in marine-terminating outlet glacier retreat rates across the Atlantic Arctic: 1992–2010

2017 ◽  
Vol 58 (74) ◽  
pp. 72-91 ◽  
Author(s):  
J. Rachel Carr ◽  
Chris. R. Stokes ◽  
Andreas Vieli
Keyword(s):  
Barents Sea ◽  
Glacier Retreat ◽  
Spatial And Temporal Variability ◽  
Remotely Sensed Data ◽  
Position Change ◽  
Outlet Glacier ◽  
Novaya Zemlya ◽  
Air Temperatures ◽  
Franz Josef Land ◽  
North Atlantic Climate

ABSTRACTAccelerated discharge through marine-terminating outlet glaciers has been a key component of the rapid mass loss from Arctic glaciers since the 1990s. However, glacier retreat and its climatic controls have not been assessed at the pan-Arctic scale. Consequently, the spatial and temporal variability in the magnitude of retreat, and the possible drivers are uncertain. Here we use remotely sensed data acquired over 273 outlet glaciers, located across the entire Atlantic Arctic (i.e. areas potentially influenced by North Atlantic climate and/or ocean conditions, specifically: Greenland, Novaya Zemlya, Franz Josef Land and Svalbard), to demonstrate high-magnitude, accelerating and near-ubiquitous retreat between 1992 and 2010. Overall, mean retreat rates increased by a factor of 3.5 between 1992 and 2000 (−30.5 m a−1) and 2000–10 (−105.8 m a−1), with 97% of the study glaciers retreating during the latter period. The Retreat was greatest in northern, western and south-eastern Greenland and also increased substantially on the Barents Sea coast of Novaya Zemlya. Glacier retreat showed no significant or consistent relationship with summer air temperatures at decadal timescales. The rate of frontal position change showed a significant, but weak, correlation with changes in sea-ice concentrations. We highlight large variations in retreat rates within regions and suggest that fjord topography plays an important role. We conclude that marine-terminating Arctic outlet glaciers show a common response of rapid and accelerating retreat at decadal timescales.

scholarly journals THE STATUS OF SEA BIRD POPULATIONS AND FACTORS DETERMINING THEIR DEVELOPMENT IN THE BARENTS SEA

2020 ◽  
Vol 11 (4) ◽  
pp. 225-245
Author(s):  
Yu.V. Krasnov ◽  
◽  
A.V. Ezhov ◽  
Keyword(s):  
Large Scale ◽  
Barents Sea ◽  
Water Masses ◽  
The Arctic ◽  
Arctic Water ◽  
Novaya Zemlya ◽  
The Barents Sea ◽  
Franz Josef Land ◽  
Food Stock ◽  
Seabird Colonies

In 2013–2019, observations on Arctic archipelagoes Novaya Zemlya and Franz-Josef Land were made. A series of multiannual monitoring of seabird colonies on the Murman coast (Kola Peninsula) were continued. The results show that large-scale negative effects on seabird populations mostly occur in areas of Atlantic water masses in the southwestern Barents Sea. On the coasts and islands ofMurman, considerable fluctuations of the number of kittiwakes and guillemots imposed on the general decreasing trend were noted. Within the Arctic water masses at Franz-Josef Land and Novaya Zemlya, the conditions of the colonies were more favorable. Geolocation data loggers helped to establish wintering and pre-breeding areas of kittiwakes and guillemots in the Barents Sea. Degradation of the seabird colonies is explained by oceanographic changes in the southern Barents Sea, along with the influence of integrative drivers such as food stock, i. e., presence and availability of capelin, and thermal conditions of the water masses determining its distribution in coastal waters.

U–Pb geochronology of Cretaceous magmatism on Svalbard and Franz Josef Land, Barents Sea Large Igneous Province

2013 ◽  
Vol 150 (6) ◽  
pp. 1127-1135 ◽  
Author(s):  
FERNANDO CORFU ◽  
STÉPHANE POLTEAU ◽  
SVERRE PLANKE ◽  
JAN INGE FALEIDE ◽  
HENRIK SVENSEN ◽  
...  
Keyword(s):  
Thermal Ionization Mass Spectrometry ◽  
Barents Sea ◽  
Large Igneous Province ◽  
The Arctic ◽  
Ionization Mass ◽  
Franz Josef Land ◽  
Igneous Province ◽  
Stratigraphic Record ◽  
Single Grain ◽  
Cretaceous Magmatism

AbstractThe opening of the Arctic oceanic basins in the Mesozoic and Cenozoic proceeded in steps, with episodes of magmatism and sedimentation marking specific stages in this development. In addition to the stratigraphic record provided by sediments and fossils, the intrusive and extrusive rocks yield important information on this evolution. This study has determined the ages of mafic sills and a felsic tuff in Svalbard and Franz Josef Land using the isotope dilution thermal ionization mass spectrometry (ID-TIMS) U–Pb method on zircon, baddeleyite, titanite and rutile. The results indicate crystallization of the Diabasodden sill at 124.5 ± 0.2 Ma and the Linnévatn sill at 124.7 ± 0.3 Ma, the latter also containing slightly younger secondary titanite with an age of 123.9 ± 0.3 Ma. A bentonite in the Helvetiafjellet Formation, also on Svalbard, has an age of 123.3 ± 0.2 Ma. Zircon in mafic sills intersected by drill cores in Franz Josef Land indicate an age of 122.7 Ma for a thick sill on Severnaya Island and a single grain age of ≥122.2 ± 1.1 Ma for a thinner sill on Nagurskaya Island. These data emphasize the importance and relatively short-lived nature of the Cretaceous magmatic event in the region.

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