Quantitative compositional analysis of the Lochkovian-Pragian
boundary event at „Na Chlumu Quarry“ (Prague Synform, Czech
Republic)

a 2015

Quantitative compositional analysis of the Lochkovian-Pragian boundary event at „Na Chlumu Quarry“ (Prague Synform, Czech Republic)

POUKAROVÁ, Hedvika, Hron KAREL, Ondřej BÁBEK, Martin FAMĚRA, Daniel ŠIMÍČEK et. al.

Základní údaje

Originální název

Quantitative compositional analysis of the Lochkovian-Pragian boundary event at „Na Chlumu Quarry“ (Prague Synform, Czech Republic)

Autoři

POUKAROVÁ, Hedvika, Hron KAREL, Ondřej BÁBEK, Martin FAMĚRA, Daniel ŠIMÍČEK, Ladislav SLAVÍK, Jindřich HLADIL a Tomáš WEINER

Vydání

31st IAS Meeting of Sedimentology, 2015

Další údaje

Jazyk

angličtina

Typ výsledku

Konferenční abstrakt

Utajení

není předmětem státního či obchodního tajemství

Klíčová slova anglicky

Prague Synform; Quantitative compositional analysis; Devonian; Lochkovian-Pragian boundary Event

Změněno: 6. 2. 2016 14:26, Mgr. Hedvika Weinerová, Ph.D.

Anotace

V originále

The Barrandian area (Prague Synform, Bohemian Massif) is a stratotype area for the Lochkovian-Pragian boundary event, which is connected with faunal and facies overturns associated with a global sea level fall. Carbonate compositional variations were studied on 49 samples from ~100 m thick section “Na Chlumu Quarry” to provide an insight into the nature of this event. Principal component and cluster analysis were applied on grain size and compositional point count data. Biased patterns resulting from covariance structure of closed data were reduced by using the log-ratio methodology. The allochem composition corresponds to heterotrophic carbonate producer assemblage while the geometry of carbonate bodies suggest a ramp setting for the Lower Devonian carbonates of the Prague Synform. The compositional data analysis indicates that the Praha Formation succession represents a distinct lowstand- to transgressive succession, with a prominent sequence boundary situated close to the Lochkovian/Pragian stage boundary. This is consistent with petrophysical patterns at numerous sections across the Prague Synform as well as with data from elsewhere. The principal component analysis and hierarchical clustering show a clear separation of different microfacies types according to dominance of the corresponding patterns. These effects are highlighted due to relative scale property and scale invariance of the original samples, taken into account by the log-ratio methodology.

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, Hron KAREL, Ondřej BÁBEK, Martin FAMĚRA, Daniel ŠIMÍČEK, Ladislav SLAVÍK, Jindřich HLADIL a Tomáš WEINER. Quantitative compositional analysis of the Lochkovian-Pragian boundary event at „Na Chlumu Quarry“ (Prague Synform, Czech Republic). In 31st IAS Meeting of Sedimentology. 2015.

@proceedings{1308369,
   author = {Poukarová, Hedvika and Karel, Hron and Bábek, Ondřej and Faměra, Martin and Šimíček, Daniel and Slavík, Ladislav and Hladil, Jindřich and Weiner, Tomáš},
   booktitle = {31st IAS Meeting of Sedimentology},
   keywords = {Prague Synform; Quantitative compositional analysis; Devonian; Lochkovian-Pragian boundary Event},
   language = {eng},
   title = {Quantitative compositional analysis of the Lochkovian-Pragian boundary event at „Na Chlumu Quarry“ (Prague Synform, Czech Republic)},
   year = {2015}
}

TY  - CONF
ID  - 1308369
AU  - Poukarová, Hedvika - Karel, Hron - Bábek, Ondřej - Faměra, Martin - Šimíček, Daniel - Slavík, Ladislav - Hladil, Jindřich - Weiner, Tomáš
PY  - 2015
TI  - Quantitative compositional analysis of the Lochkovian-Pragian boundary event at „Na Chlumu Quarry“ (Prague Synform, Czech Republic)
KW  - Prague Synform
KW  - Quantitative compositional analysis
KW  - Devonian
KW  - Lochkovian-Pragian boundary Event
N2  - The Barrandian area (Prague Synform, Bohemian Massif) is a stratotype area for the Lochkovian-Pragian boundary event, which is connected with faunal and facies overturns associated with a global sea level fall. Carbonate compositional variations were studied on 49 samples from ~100 m thick section “Na Chlumu Quarry” to provide an insight into the nature of this event. Principal component and cluster analysis were applied on grain size and compositional point count data. Biased patterns resulting from covariance structure of closed data were reduced by using the log-ratio methodology. The allochem composition corresponds to heterotrophic carbonate producer assemblage while the geometry of carbonate bodies suggest a ramp setting for the Lower Devonian carbonates of the Prague Synform. The compositional data analysis indicates that the Praha Formation succession represents a distinct lowstand- to transgressive succession, with a prominent sequence boundary situated close to the Lochkovian/Pragian stage boundary. This is consistent with petrophysical patterns at numerous sections across the Prague Synform as well as with data from elsewhere. The principal component analysis and hierarchical clustering show a clear separation of different microfacies types according to dominance of the corresponding patterns. These effects are highlighted due to relative scale property and scale invariance of the original samples, taken into account by the log-ratio methodology.
ER  -

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