Electrical resistivity imaging of anastomosing river subsurface stratigraphy and possible controls of fluvial style change in a graben-like basin, Czech Republic

Bábek, Ondřej; Sedláček, Jan; Novák, Aleš; Létal, Aleš

doi:10.1016/j.geomorph.2018.05.012

Cited by 20 publications

(25 citation statements)

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“…Alternatively, such patterns are found in tributaries or headwater drainage areas due to a high-discharge/excess of sediment supply, e.g. the Morava River (Bábek et al, 2018), the Jeetzel valley (Turner et al, 2013) or the Moervaart palaeolake (Crombé et al, 2013). The latter reveals an evolution of the drainage system, from an anastomosed network to a single meandering channel, caused by lacustrine level decrease.…”

Section: Preservation Potential and Geomorphological Features As Key mentioning

confidence: 99%

“…To this end, four electrical resistivity tomography (ERT) profiles have been undertaken using a multimode resistivity imaging system (Syscal Pro Switch, Iris Instruments©). This method is widely employed in alluvial system (Vandenberghe and Desmedt, 1979;Vandenberghe, 1981;Van Huissteden et al, 1986;Chambers et al, 2012;Laigre et al, 2012;Hausmann et al, 2013;Rey et al, 2013;Matys Grygar et al, 2016;Bábek et al, 2018). The survey positioning was chosen in such a way that the paleochannels identified by aerial imagery were intersected.…”

Section: Geophysical Investigationsmentioning

confidence: 99%

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Small headwater stream evolution in response to Lateglacial and Early Holocene climatic changes and geomorphological features in the Saint-Gond marshes (Paris Basin, France)

et al. 2019

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Section: Preservation Potential and Geomorphological Features As Key mentioning

confidence: 99%

Section: Geophysical Investigationsmentioning

confidence: 99%

Small headwater stream evolution in response to Lateglacial and Early Holocene climatic changes and geomorphological features in the Saint-Gond marshes (Paris Basin, France)

et al. 2019

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“…Reflexně seismický výzkum pozdně kenozoické zlomové tektoniky na vybraných lokalitách hornomoravského úvalu. -Geologické výzkumy na Moravě a ve Slezsku,27,[1][2][15][16][17][18][19][20] DOI: https://doi.org /10.5817/ GVMS2020-12650 úval s. s., lutínský příkop, prostějovský příkop), ve kterých jsou dokumentovány dobře datované sedimenty pliocénu, svrchního pleistocénu a holocénu (Zeman et al 1980;Čtyroký 1995;Zapletal 2005;Novák et al 2017;Bábek et al 2018) o úhrnné mocnosti až 300 m (Růžička 1989). Tato depocentra jsou oddělena hrásťovými strukturami (hněvotínská a třebčínská elevace), ve kterých na povrch vychází starší horniny miocénu, paleozoika a dokonce krystalinické horniny brunovistulika (Dudek 1980;Zapletal 1985).…”

Section: úVodunclassified

Reflexně seismický výzkum pozdně kenozoické zlomové tektoniky na vybraných lokalitách hornomoravského úvalu

Bábek¹,

Lenďáková²,

Tóth³

et al. 2020

Geologické výzkumy

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We measured shallow reflection seismic profiles across the assumed faults in the Late Cenozoic (Pliocene – Holocene) Upper Morava Basin (UMB). The faults in the UMB are indicated by horst-and-graben morphology, differential thickness of Pliocene and Quaternary siliciclastic sediments, considerable gravity gradients a present-day seismicity. Four seismic lines, 380 to 860 m long (fixed geophone spread) were designed to cross the assumed faults at three sites, Mezice, Drahlov and Výšovice. The data were acquired by 24-channel ABEM Terraloc Mk-8 seismic system with PEG-40 accelerated weight drop source and processed by Sandmaier ReflexW and Halliburton Landmark ProMax® seismic processing software. The processing included application of filters (DC shift, scaled windowgain, bandpass frequency and muting), stacking using normal moveout constant velocity stack, additional application of subtrack-mean (dewow) filter, topographic correction and low velocity layer static correction. Distinct reflectors were detected up to 400 ms TWT, which corresponds to maximum depth of 280 and 350 m at 1400 and 1750 km.s-1 velocities, respectively. The observed reflection patterns were classified into three seismic facies, which were interpreted as crystalline rocks (Brunovistulicum) and/or well consolidated Paleozoic sedimentary rocks (SF1), unconsolidated Quaternary siliciclastic sediments (SF2) and semi-consolidated Neogene clays (SF3) based on the cores drilled in their close vicinity. Distinct faults were observed at the Drahlov and Výšovice 2 profile, which coincided with the observed topographic steps between the horsts and grabens. Presence of the fault at the Drahlov profile separating the Hněvotín Horst from the Lutín Graben was demonstrated by independent electrical resistivity tomography profile. On the other hand, another topographic step at the Mezice profile, between the Hněvotín Horst and Olomouc Graben, does not correspond to any seismic indication of a fault. The reflection seismic proved to be useful and relatively low-cost method to visualize the shallow subsurface geology in the Upper Morava Basin.

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“…Fosilní půdní komplex v Litovli by mohl stratigraficky odpovídat PK I na jiných moravských lokalitách. Hlavním argumentem je OSL datování báze svrchního sprašového pokryvu v Litovli do doby cca 21 500 let BP (Bábek et al 2018). V Dolních Věstonicích byla svrchní část PK I datována radiokarbonově na 26 000-29 000 let BP, což odpovídá teplotně průměrnému interstadiálu denekamp (Frechen et al 1999).…”

Section: Diskuzeunclassified

Petrofyzikální Charakteristika Spraše a Fosilní Půdy v Hliníku U Litovle

Šimíček¹,

Krulová²

2018

Geologické výzkumy

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Loess-paleosol sequences are an important source of terrestrial paleoclimatic proxy-data. Quaternary loess and loess loam cover the most of surface of the Upper Moravian Basin. Samples from loess-paleosol sequence in vicinity of Litovel town were studied using magnetic susceptibility, spectrophotometry and laser granulometry. Obtained petrophysical data were compared with detailed lithological description of section and geochemical characteristics determined by ED-XRF method. The results contribute to interpretation of paleoclimate in the Upper Moravian Basin during the last glacial.Section with total thickness of about 5 m is formed by loess in its upper part. This layer covers several soil horizons. It is most probably youngest loess deposit formed during the last glacial maximum. Petrophysical and geochemical data and comparison with nearby sites indicate relatively humid cold tundra conditions with bush-steppe vegetation during deposition of loess. Lithological features, position below youngest loess deposit and petrophysical and geochemical data allow interpretation of soil horizons as PK I. Low values of magnetic susceptibility indicate formation of soil in arctic interstadial conditions with higher humidity compared to interstadial average. Values of magnetic susceptibility of PK I are equal or even lower than in overlaying loess which doesn´t correspond with usual behaviour of magnetic susceptibility in loess-paleosol sequences in the Czech Republic. It could be explained by formation of soil horizons in cold interstadial climate (low production of oxi/hydroxide of Fe) supplemented by increased humidity and hence, intensive illimerization process (clay migration and Fe-minerals depletion).

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Electrical resistivity imaging of anastomosing river subsurface stratigraphy and possible controls of fluvial style change in a graben-like basin, Czech Republic

Cited by 20 publications

References 51 publications

Small headwater stream evolution in response to Lateglacial and Early Holocene climatic changes and geomorphological features in the Saint-Gond marshes (Paris Basin, France)

Small headwater stream evolution in response to Lateglacial and Early Holocene climatic changes and geomorphological features in the Saint-Gond marshes (Paris Basin, France)

Reflexně seismický výzkum pozdně kenozoické zlomové tektoniky na vybraných lokalitách hornomoravského úvalu

Petrofyzikální Charakteristika Spraše a Fosilní Půdy v Hliníku U Litovle

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