Outcrop gamma-ray logging of siliciclastic turbidites:
Separating the detrital provenance signal from facies in the
foreland-basin turbidites of the Moravo-Silesian basin, Czech
Republic

J 2012

Outcrop gamma-ray logging of siliciclastic turbidites: Separating the detrital provenance signal from facies in the foreland-basin turbidites of the Moravo-Silesian basin, Czech Republic

ŠIMÍČEK, Daniel, Ondrej BABEK and Jaromír LEICHMANN

Basic information

Original name

Outcrop gamma-ray logging of siliciclastic turbidites: Separating the detrital provenance signal from facies in the foreland-basin turbidites of the Moravo-Silesian basin, Czech Republic

Name in Czech

terenní gamaspektrometrie siliciklastických turbiditů, provenience detritického materiálu turbiditů moravsko-slezského kulmu

Authors

ŠIMÍČEK, Daniel (203 Czech Republic, guarantor, belonging to the institution), Ondrej BABEK (203 Czech Republic) and Jaromír LEICHMANN (203 Czech Republic, belonging to the institution)

Edition

Sedimentary Geology, Amsterodam, Elsevier, 2012, 0037-0738

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10500 1.5. Earth and related environmental sciences

Country of publisher

Netherlands

Confidentiality degree

není předmětem státního či obchodního tajemství

Impact factor

Impact factor: 1.802

RIV identification code

RIV/00216224:14310/12:00064471

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1016/j.sedgeo.2012.03.003

UT WoS

000303957600004

Keywords (in Czech)

gamaspektrometrie, petrografie pískovců, Český masiv, Karbon,

Keywords in English

Gamma-ray spectra; Sandstone petrography; Bohemian Massif; Carboniferous; Foreland basin; Stratigraphy

Abstract

ORIG CZ

V originále

AB Standard and spectral gamma-ray (GRS) logs are widely used as indicators of fades in the subsurface. In siliciclastics, however, the gamma-ray signal is often influenced by changes in the provenance of the K, U and Th-bearing detrital minerals. In this paper, we have compared outcrop and laboratory GRS with modal and chemical sandstone and mudstone composition and fades in an approximately 2.5 km-thick siliciclastic turbidite system of the Moravo-Silesian Culm Basin (Lower Carboniferous), Czech Republic. The aim was to separate the facies signal from the detrital provenance one. The siliciclastics have moderately high outcrop gamma-ray values (174 API on average) and slightly lower laboratory values (127 API). Both the outcrop and laboratory data show low sensitivity to facies, which is demonstrated by the low contrast between the K, U and Th concentrations in the seven facies types ranging from proximal to distal turbidites. Markedly higher GRS variability is observed between equivalent facies at different stratigraphic levels. Major carriers of the GRS signal include K-feldspars, muscovite, sericite, biotite and albite for K, zircon, apatite, monazite and xenotime for U and monazite, thorite, REE secondary minerals, xenotime, apatite and zircon for Th. With the effect of facies filtered out, the GRS values reveal a stratigraphic variability, which coincide with the changes in the sandstone modal composition. A shift from the low-grade metamorphic and volcano-sedimentary provenance to predominantly magmatic sources with ultrapotassic plutonites in the early Late Visean is associated with a marked increase in U and Th concentrations and generally higher sandstone radioactivity compared to mudstones. Another provenance shift to high-grade metamorphic sources with granulites in the latest Visean is associated with a rapid decrease in Th, U and partly K concentrations and an increase in the GRS contrast between sandstone and mudstone facies. The GRS data sensitively reflect the extremely rapid exhumation of mid-crustal and deep-crustal rocks in the major source area, the Moldanubian Zone of the Bohemian Massif.

In Czech

terenní gamaspektrometrie siliciklastických turbiditů, provenience detritického materiálu turbiditů moravsko-slezského kulmu

Citovat

ŠIMÍČEK, Daniel, Ondrej BABEK and Jaromír LEICHMANN. Outcrop gamma-ray logging of siliciclastic turbidites: Separating the detrital provenance signal from facies in the foreland-basin turbidites of the Moravo-Silesian basin, Czech Republic. Sedimentary Geology. Amsterodam: Elsevier, 2012, vol. 261, No 6, p. 50-64. ISSN 0037-0738. Available from: https://dx.doi.org/10.1016/j.sedgeo.2012.03.003.

@article{1092627,
   author = {Šimíček, Daniel and Babek, Ondrej and Leichmann, Jaromír},
   article_location = {Amsterodam},
   article_number = {6},
   doi = {http://dx.doi.org/10.1016/j.sedgeo.2012.03.003},
   keywords = {Gamma-ray spectra; Sandstone petrography; Bohemian Massif; Carboniferous; Foreland basin; Stratigraphy},
   language = {eng},
   issn = {0037-0738},
   journal = {Sedimentary Geology},
   title = {Outcrop gamma-ray logging of siliciclastic turbidites: Separating the detrital provenance signal from facies in the foreland-basin turbidites of the Moravo-Silesian basin, Czech Republic},
   volume = {261},
   year = {2012}
}

TY  - JOUR
ID  - 1092627
AU  - Šimíček, Daniel - Babek, Ondrej - Leichmann, Jaromír
PY  - 2012
TI  - Outcrop gamma-ray logging of siliciclastic turbidites: Separating the detrital provenance signal from facies in the foreland-basin turbidites of the Moravo-Silesian basin, Czech Republic
JF  - Sedimentary Geology
VL  - 261
IS  - 6
SP  - 50-64
EP  - 50-64
PB  - Elsevier
SN  - 00370738
KW  - Gamma-ray spectra
KW  - Sandstone petrography
KW  - Bohemian Massif
KW  - Carboniferous
KW  - Foreland basin
KW  - Stratigraphy
N2  - AB Standard and spectral gamma-ray (GRS) logs are widely used as indicators of fades in the subsurface. In siliciclastics, however, the gamma-ray signal is often influenced by changes in the provenance of the K, U and Th-bearing detrital minerals. In this paper, we have compared outcrop and laboratory GRS with modal and chemical sandstone and mudstone composition and fades in an approximately 2.5 km-thick siliciclastic turbidite system of the Moravo-Silesian Culm Basin (Lower Carboniferous), Czech Republic. The aim was to separate the facies signal from the detrital provenance one. The siliciclastics have moderately high outcrop gamma-ray values (174 API on average) and slightly lower laboratory values (127 API). Both the outcrop and laboratory data show low sensitivity to facies, which is demonstrated by the low contrast between the K, U and Th concentrations in the seven facies types ranging from proximal to distal turbidites. Markedly higher GRS variability is observed between equivalent facies at different stratigraphic levels. Major carriers of the GRS signal include K-feldspars, muscovite, sericite, biotite and albite for K, zircon, apatite, monazite and xenotime for U and monazite, thorite, REE secondary minerals, xenotime, apatite and zircon for Th. With the effect of facies filtered out, the GRS values reveal a stratigraphic variability, which coincide with the changes in the sandstone modal composition. A shift from the low-grade metamorphic and volcano-sedimentary provenance to predominantly magmatic sources with ultrapotassic plutonites in the early Late Visean is associated with a marked increase in U and Th concentrations and generally higher sandstone radioactivity compared to mudstones. Another provenance shift to high-grade metamorphic sources with granulites in the latest Visean is associated with a rapid decrease in Th, U and partly K concentrations and an increase in the GRS contrast between sandstone and mudstone facies. The GRS data sensitively reflect the extremely rapid exhumation of mid-crustal and deep-crustal rocks in the major source area, the Moldanubian Zone of the Bohemian Massif.
ER  -

ŠIMÍČEK, Daniel, Ondrej BABEK and Jaromír LEICHMANN. Outcrop gamma-ray logging of siliciclastic turbidites: Separating the detrital provenance signal from facies in the foreland-basin turbidites of the Moravo-Silesian basin, Czech Republic. \textit{Sedimentary Geology}. Amsterodam: Elsevier, 2012, vol.~261, No~6, p.~50-64. ISSN~0037-0738. Available from: https://dx.doi.org/10.1016/j.sedgeo.2012.03.003.

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