Quantitative allochem composition analysis of
Lochkovian-Pragian boundary sections of the Barrandian area
(Prague Basin, Czech Republic)

a 2016

Quantitative allochem composition analysis of Lochkovian-Pragian boundary sections of the Barrandian area (Prague Basin, Czech Republic)

POUKAROVÁ, Hedvika; Karel HRON; Ondřej BÁBEK; Jindřich HLADIL; Martin FAMĚRA et al.

Základní údaje

Originální název

Quantitative allochem composition analysis of Lochkovian-Pragian boundary sections of the Barrandian area (Prague Basin, Czech Republic)

Autoři

POUKAROVÁ, Hedvika; Karel HRON; Ondřej BÁBEK; Jindřich HLADIL; Martin FAMĚRA; Daniel ŠIMÍČEK; Tomáš WEINER a Ladislav SLAVÍK

Vydání

32st IAS Meeting of Sedimentology, 2016

Další údaje

Jazyk

angličtina

Typ výsledku

Konferenční abstrakt

Obor

10500 1.5. Earth and related environmental sciences

Utajení

není předmětem státního či obchodního tajemství

Označené pro přenos do RIV

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

Barrandian; Devonian; Lochkovian-Pragian boundary Event; Quantitative composition analysis; Microfacies

Změněno: 2. 8. 2016 14:07, Mgr. Hedvika Weinerová, Ph.D.

Anotace

V originále

The Lochkovian-Pragian boundary Event, connected to faunal and facies overturns accompanying global sea level fall, is the first in the series of global Devonian events defined in the classical Barrandian area (Prague Basin, Czech Republic). Carbonate compositional variations were studied on 148 samples from sections at Čertovy schody (257.5 m), Na Chlumu (96.5 m) and Na Branžovech (109.5 m) quarries. Raw quantitative data of determinable allochems (da) obtained by point-count method were used for correspondence, principal component and cluster analysis. The latter two were applied also on data transformed by the log-ratio methodology (clr) that was used to reduce biased patterns resulting from covariance structure of closed data. With the environmental gradient from shallow photic- to deep aphotic zones, several allochem categories were distinguished using the multivariate statistical analysis. The inferred curves of facies shifts show similar results for the raw and log-ratio transformed data. Stratigraphic distribution of the results indicates a lowstand- to transgressive- to highstand- succession in the Praha Formation with a prominent sequence boundary situated close to the Lochkovian/Pragian stage boundary. The heterotroph dominated associations with little contribution of phototrophs and peloids (supported by regional-scale facies architecture) suggest ramp topography.

Návaznosti

GA14-18183S, projekt VaV

Název: Sekvenční stratigrafie devonských bioeventů - výkyvy mořské hladiny na přechodu od klimatického režimu greenhouse k icehouse

Investor: Grantová agentura ČR, Sekvenční stratigrafie devonských bioeventů – výkyvy mořské hladiny na přechodu od klimatického režimu greenhouse k icehouse

Citovat

POUKAROVÁ, Hedvika; Karel HRON; Ondřej BÁBEK; Jindřich HLADIL; Martin FAMĚRA; Daniel ŠIMÍČEK; Tomáš WEINER a Ladislav SLAVÍK. Quantitative allochem composition analysis of Lochkovian-Pragian boundary sections of the Barrandian area (Prague Basin, Czech Republic). In 32st IAS Meeting of Sedimentology. 2016.

@proceedings{1350798,
   author = {Poukarová, Hedvika and Hron, Karel and Bábek, Ondřej and Hladil, Jindřich and Faměra, Martin and Šimíček, Daniel and Weiner, Tomáš and Slavík, Ladislav},
   booktitle = {32st IAS Meeting of Sedimentology},
   keywords = {Barrandian; Devonian; Lochkovian-Pragian boundary Event; Quantitative composition analysis; Microfacies},
   language = {eng},
   title = {Quantitative allochem composition analysis of Lochkovian-Pragian boundary sections of the Barrandian area (Prague Basin, Czech Republic)},
   year = {2016}
}

TY  - CONF
ID  - 1350798
AU  - Poukarová, Hedvika - Hron, Karel - Bábek, Ondřej - Hladil, Jindřich - Faměra, Martin - Šimíček, Daniel - Weiner, Tomáš - Slavík, Ladislav
PY  - 2016
TI  - Quantitative allochem composition analysis of Lochkovian-Pragian boundary sections of the Barrandian area (Prague Basin, Czech Republic)
KW  - Barrandian
KW  - Devonian
KW  - Lochkovian-Pragian boundary Event
KW  - Quantitative composition analysis
KW  - Microfacies
N2  - The Lochkovian-Pragian boundary Event, connected to faunal and facies overturns accompanying global sea level fall, is the first in the series of global Devonian events defined in the classical Barrandian area (Prague Basin, Czech Republic). Carbonate compositional variations were studied on 148 samples from sections at Čertovy schody (257.5 m), Na Chlumu (96.5 m) and Na Branžovech (109.5 m) quarries. Raw quantitative data of determinable allochems (da) obtained by point-count method were used for correspondence, principal component and cluster analysis. The latter two were applied also on data transformed by the log-ratio methodology (clr) that was used to reduce biased patterns resulting from covariance structure of closed data. With the environmental gradient from shallow photic- to deep aphotic zones, several allochem categories were distinguished using the multivariate statistical analysis. The inferred curves of facies shifts show similar results for the raw and log-ratio transformed data. Stratigraphic distribution of the results indicates a lowstand- to transgressive- to highstand- succession in the Praha Formation with a prominent sequence boundary situated close to the Lochkovian/Pragian stage boundary. The heterotroph dominated associations with little contribution of phototrophs and peloids (supported by regional-scale facies architecture) suggest ramp topography.
ER  -

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