Facies characterization of organic-rich mudstones from the Chokier Formation (lower Namurian), south Belgium

Nyhuis, Christian J., Rippen, Daniel and Denayer, Julien (2014) Facies characterization of organic-rich mudstones from the Chokier Formation (lower Namurian), south Belgium. Geologica Belgica, 17 3-4: 311-322.

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Author Nyhuis, Christian J.
Rippen, Daniel
Denayer, Julien
Title Facies characterization of organic-rich mudstones from the Chokier Formation (lower Namurian), south Belgium
Journal name Geologica Belgica   Check publisher's open access policy
ISSN 1374-8505
Publication date 2014-01-01
Year available 2014
Sub-type Article (original research)
Open Access Status File (Publisher version)
Volume 17
Issue 3-4
Start page 311
End page 322
Total pages 12
Place of publication Liege, Belgium
Publisher Universite de Liege
Language eng
Formatted abstract
In a case study of two wells from the Namur Synclinorium, the black shale-dominated Chokier Formation was analyzed for petrography, mineralogy and organic geochemistry. Thin section petrography revealed a different facies assemblage for each well and a total of six microfacies types. Whole rock mineralogical data largely conrms a facies-dependent mineral composition.  All different microfacies types of locality 1 (MFT-1, laminated silty mudstone; MFT-2, laminated mud-clast-rich mudstone; MFT-3, calcareous bioclast-rich mudstone) and locality 2 (MFT-4, lenticular mudstone; MFT-5, burrow-mottled mudstone; MFT-6, burrowed silty laminated mudstone) show ample evidence of a distal shelf environment that is sourced by currents, which may be linked to seasonal (monsoonal) transport of sediment from land to sea. Erosive bedload transport is an important mechanism of sedimentation whereas accumulation by settling from the water column can be excluded for the majority of investigated strata. Frequently, endobenthic activity and other processes after deposition, e.g. winnowing and reworking, caused strong fabric modications. Various, but simple ichnofabrics prove at least temporary dysoxic conditions as conrmed by relatively low TS/TOC ratios. With regard to sedimentary features, organic geochemistry data hints to organic matter preservation due to rapid burial rather than intense anoxity. Silicication is a widespread diagenetic feature independent from facies and locality. It is most likely linked to a high supply rate of terrestrially dissolved silica as indicated by SEM observations, paleogeographic constraints and sedimentary features.
Keyword Carboniferous
Namur Synclinorium
Drill core
Black Shale
Oceanic Anoxic Event
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
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