The 232Th distribution in modern sediments near radioactive lovchorrite mine, the Khibiny Mountains, Kola Peninsula

Ivanov, M.; Kuzmenkova, N. V.; Garankina, Ekaterina Vadimovna; Tulyakov, Egor

doi:10.1016/j.gexplo.2019.01.005

Cited by 3 publications

(3 citation statements)

References 30 publications

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“…The contribution of constant water flow within the stream channel is limited to washing the fine fractions out. The latter, according to the alpha spectrometry (Ivanov et al, 2019), make the most relevant contribution to the total radioactivity of the samples and can cause positive radioactive anomalies in sedimentation basins (deltas, lakes, artificial ponds) outside the catchments. Thus, secondary redeposition of the 232 Th-rich fine fractions is possible downstream, along the receiving Yuksporrjok River and towards the Bolshoj Vudjavr Lake.…”

Section: Resultsmentioning

confidence: 99%

“…Resembling sets of hazardous episodes, some with fatal consequences, are reported for other mountainous Arctic and Subarctic environments in Russia, Scandinavia (Nyberg, 1989;Hestnes and Kristensen, 2010;Jonsson and Gauer, 2014) and Northern America (André, 1995;Larocque et al, 2001;Relf et al, 2015, etc.). In Japan, more than 90 casualties due to slush flows have been registered since 1945 (Kobayashi et al, 1994).…”

Section: Introductionmentioning

confidence: 88%

“…Gamma activities of 232 Th daughter radionuclides 212 Pb and 228 Ac were measured with the ORTEC GEM-C5060P4-B HPGe detector. Alpha activities of 228,232 Th isotopes of sequentially extracted aliquots of the most active samples were measured with the ORTEC Alpha-Ensemble-2 with detector ENS-U900 type UL-TRA-AS displaying the content and ratio of 212 Pb and 228 Ac and corresponding physicochemical forms of 232 Th (Ivanov et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

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Magnitude and frequency of debris and slush flows in the Khibiny mountain valleys, Kola Peninsula, NW Russia

et al. 2019

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Abstract. Available results for five studied valleys of the Khibiny Mountains, Kola Peninsula, suggest that slush flows and, possibly for some valleys, typical debris flows with lower frequency, are a leading mechanism for downstream sediment delivery and valley floor topographical formation. Typical fluvial topography in slush flow-affected basins is extremely suppressed or nonexistent, since under such conditions, stream channels are unable to rework slush flow deposits. The recovery phase of fluvial topography can serve as an indicator of the magnitude and time passed since the last extreme event. A combination of grain size analysis, radionuclide fingerprinting with the 232Th content in the finer-grained sediment matrix (size <10 mm) and 14C dating, were applied to reveal the age and common structure of debris and slush flow environments and to investigate the main factors in their lithodynamics. Those helped to estimate transportation distances and capacities of the flows and the amount of fluvial reworking of its deposits with time. Application of radiocarbon dating to determine absolute ages (about 30 dates) of stabilization periods for the colluvial cones, mountain fans and valley bottoms and integration with other available chronological data provided a basis for distinguishing several stages of decreased activity of debris and slush flows and extreme slope failures through the second half of the Holocene. Field mapping and remote sensing data interpretation revealed spatial distribution patterns of debris and slush flows. Geomorphic analysis of large relic landforms in valley bottoms confirms, in general, the case for a significant reduction of debris flow magnitude since the last deglaciation and distinct shift to slush flow processes with much lower clastic content. A reliable chronology of the early events is yet to be obtained representing a challenging problem for future research.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 88%

Section: Methodsmentioning

confidence: 99%

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Magnitude and frequency of debris and slush flows in the Khibiny mountain valleys, Kola Peninsula, NW Russia

et al. 2019

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Use of natural and artificial radionuclides to determine the sedimentation rates in two North Caucasus lakes

Kuzmenkova

Ivanov

Alexandrin

et al. 2020

Environmental Pollution

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Sediment and Particulate 137Cs Budget Studies in Upa River Basin: History, Results, and Prospects

Ivanov

Иванова

Golosov

2023

Land

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The intensive pollution of vast areas after the Chernobyl accident, especially in the territories of Ukraine, Russia, and Belarus, has not only become a serious environmental issue, but also presents wide methodological opportunities for studying the functioning of natural systems. The proposed work is a generalization of the results of studies on the migration of 137Cs in the runoff of river sediments, which were carried out in the basin of the Upa River for over 30 years after the accident. This basin is one of the most radioactively contaminated and studied in Central Russia. Over the past three decades, under the conditions of the decreasing snowmelt runoff in the spring and reduced share of cultivated land over the post-Soviet period, the intensity of the 137Cs transfer has decreased. The 137Cs deposit losses associated with erosion activities do not exceed a few percent. Most of the mobilized sediments and sediment-associated radionuclides accumulate in dry valleys or artificial reservoirs. With a general reduction in the durations of floods, rivers have become the predominant channels for the transfer of sediment yield and particulate pollutants. The exploration of the vertical distribution of the 137Cs in the accumulative strata makes it possible to identify the changes in the sediment budgets of the rivers and their radioecological consequences.

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The 232Th distribution in modern sediments near radioactive lovchorrite mine, the Khibiny Mountains, Kola Peninsula

Cited by 3 publications

References 30 publications

Magnitude and frequency of debris and slush flows in the Khibiny mountain valleys, Kola Peninsula, NW Russia

Magnitude and frequency of debris and slush flows in the Khibiny mountain valleys, Kola Peninsula, NW Russia

Use of natural and artificial radionuclides to determine the sedimentation rates in two North Caucasus lakes

Sediment and Particulate 137Cs Budget Studies in Upa River Basin: History, Results, and Prospects

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