Seismites in Quaternary sediments of southeastern Altai

Деев, Е. В.; Zolnikov, I. D.; Гуськов, С. А.

doi:10.1016/j.rgg.2008.10.004

Cited by 41 publications

(4 citation statements)

References 15 publications

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“…They are believed to be seismogenic and associated with earthquakes of magnitude ≥5.5 Mw due to their resemblance to faults described in the Altai Mountains, with an offset attenuating upward (Deev et al . ).…”

Section: Study Areamentioning

confidence: 97%

Quaternary thermokarst and thermal erosion features in northern France: origin and palaeoenvironments

Vliët-Lanoé

Brulhet²,

Combes³

et al. 2016

Boreas

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A thermokarst is a collapse feature resulting from the thawing of ice-rich permafrost or of massive ice of various origins. Little attention has been paid to the sedimentary fabric resulting from this type of collapse, except for glaciotectonic features. In western Europe, two palaeo-forms are commonly studied: lithalsas and ice-wedge casts. Collapsed pingos are much rarer. Very few papers have compiled present-day and fossil data. Here, field data collected from quarries in the eastern Paris Basin were analysed, providing useful records of thermokarst collapses in alluvial calcareous silts, sands, and gravels. These forms have a circular shape when viewed on satellite images. Permafrost is attested regionally by the recurrent occurrence of meter-sized pattern grounds at the surface of the chalk and of ice-wedge casts. Traces of segregation and reticulate ice are common. These features are primarily connected to a major interstadial, c. 150 ka BP, orbitally forced and commonly associated with a major glacial retreat. They occur both in drained and waterlogged situations, resulting in a specific pattern of deformation. They are controlled by the brittle and plastic behaviour of sediments and resemble passive glaciotectonism. Normal and reverse faults, with the offset decreasing downward, are common, and those with local shear are reported. Lithalsas, seasonal frost blisters, spring frost blisters and perhaps pingos seem to have formed. Most of these deformations correspond to thermokarst sinkholes bordered by gravitational collapse faults. The offset of these faults increases towards the surface, and the faults have been recurrently confused with neotectonism triggered by palaeo-earthquakes. However, there are no faults beneath the observed deformation features, and the region lacks recorded seismic activity over the last century. Our data may be helpful in interpreting similar structures elsewhere.Brigitte Van Vliet-Lano€ e (brigitte.vanvlietlanoe@univ-brest.fr), Domaines Oc eaniques Laboratory, UMR 6538

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Section: Study Areamentioning

confidence: 97%

Quaternary thermokarst and thermal erosion features in northern France: origin and palaeoenvironments

Vliët-Lanoé

Brulhet²,

Combes³

et al. 2016

Boreas

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“…High seismicity of the SE Altai is evidenced by paleoruptures, numerous large Holocene earthquake induced landslides, and seismic convolutions in soft sediments (Fig. 2) (Butvilovsky, 1993;Rogozhin and Platonova, 2002;Rogozhin et al, 2007;Deev et al, 2009and Agatova et al, 2006, 2014a. Recently it was supported by the 2003 Chuya earthquake (M S =7.3).…”

Section: Geological Settings and Evidences Of High Regional Seismicitymentioning

confidence: 97%

Recurrence interval of strong earthquakes in the se Altai, Russia revealed by tree-ring analysis and radiocarbon dating

Непоп

Агатова

2018

Geochronometria

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This paper presents the results of paleoseismogeological investigations including tree-ring analysis and radiocarbon dating in pleistoseist zone of the 2003 Chuya earthquake, SE Altai, Russia. Twenty-five radiocarbon dates of previously unknown evidences of prehistoric earthquakes along the fault bounders of the Chagan-Uzun massif, North Chuya and South Chuya ranges are reported. Perspectives of applying dendroseismological approach within the high mountainous seismically active southeastern part of Russian Altai are demonstrated. In addition to estimating the germination ages of trees growing on the bare surfaces of seismically triggered landslides, analysis of wood penetrating injuries in the individual tree ring series was applied for dating paleorock-falls. Analysis of distribution patterns of tree-ring anomalies and injured trees suggests a criterion of recognizing seismic origin of past rock-falls. Dendrochronologically obtained dates of abrupt intensifications of rock-falls can be considered as supposed dates of past earthquakes, which should be verified by alternative proxy data. Obtained results argue for the high regional seismicity in the second half of the Holocene. Strong earthquakes occurred here AD 1532, and 600-700, 1300-1500, 2400-2700, 3400-3700, 3800-4200 cal BP. This data clarifies the chronology of seismic events within the SE Altai. The specified recurrence interval of strong earthquakes is about 400 years during the last 4000 years.

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“…The failure of the rock slide dam and the draining of such a lake might have caused a substantially larger flood than typical spring floods of the Katun' River. Notably, the seismic factor might have played a role during both the formation and break of the rock slide dam, because seismites of different types were found in the lacustrine sediments (Deev et al, 2009).…”

Section: Floods In the Katun' Valley At Mis 3-mismentioning

confidence: 99%

New results of OSL dating of Quaternary sediments in the Upper Katun’ valley (Gorny Altai) and adjacent area

Zolnikov

Деев

Kotler

et al. 2016

Russian Geology and Geophysics

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Several sections have been studied to understand the distribution and interrelation of basic genetic types of Quaternary deposits in the Uimon basin and adjacent area. The OSL date of 101 ± 10 ka from the glaciolacustrine terrace on the northeastern rim of the basin corresponds to the cool substage of MIS 5. The glaciolacustrine sediments of the northern rim are covered with widespread diamictic flows of the outburst draining of the ice-dammed lake. The diamicts are overlain by a subaerial complex of loesses and three fossil soils. From the OSL loess dates in the range of 43 to 49 ka we infer that the complex formed from the early MIS 3 through the Holocene. This is also supported by radiocarbon dates from alluvial deposits incised into the glaciolacustrine terrace and into megaflood sediments of the final draining of the last paleolake. The OSL dates in the range of 77 to 89 ka from alluvial sediments indicate that postglacial downcutting of the present-day Katun' valley probably started just after MIS 5. The discrepancy between the beryllium dates from dropstones and Holocene TL-dates of the Katun' valley floods ranging from 23 to 6 ka can be explained if the younger floods are related to the draining of moraine-and rock slide dammed rather than ice-dammed lakes. The younger floods, though being less voluminous than the glacial megafloods, were capable of producing giant ripple marks.

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Seismites in Quaternary sediments of southeastern Altai

Cited by 41 publications

References 15 publications

Quaternary thermokarst and thermal erosion features in northern France: origin and palaeoenvironments

Quaternary thermokarst and thermal erosion features in northern France: origin and palaeoenvironments

Recurrence interval of strong earthquakes in the se Altai, Russia revealed by tree-ring analysis and radiocarbon dating

New results of OSL dating of Quaternary sediments in the Upper Katun’ valley (Gorny Altai) and adjacent area

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