2013
Multi-proxy study of shallow platform carbonates at the Devonian/Carboniferous boundary (Ertoucun and Nanbiancun, South China): a diachronous detrital event
DEVLEESCHOUVER, Xavier; Katarzyna SOBIEN; Tomáš KUMPAN; Simo SPASSOV; Daizhao CHEN et. al.Basic information
Original name
Multi-proxy study of shallow platform carbonates at the Devonian/Carboniferous boundary (Ertoucun and Nanbiancun, South China): a diachronous detrital event
Authors
DEVLEESCHOUVER, Xavier (56 Belgium, guarantor); Katarzyna SOBIEN (616 Poland); Tomáš KUMPAN (203 Czech Republic, belonging to the institution); Simo SPASSOV (56 Belgium); Daizhao CHEN (156 China) and Ondřej BÁBEK (203 Czech Republic)
Edition
IGCP 580-596 - Geophysical and Geochemical Techniques: A Window on the Palaeozoic World, 2013
Other information
Language
English
Type of outcome
Conference abstract
Field of Study
10500 1.5. Earth and related environmental sciences
Country of publisher
Czech Republic
Confidentiality degree
is not subject to a state or trade secret
RIV identification code
RIV/00216224:14310/13:00066520
Organization unit
Faculty of Science
Keywords in English
petrophysics;china;devonian-carboniferous boundary;stratigraphy
Changed: 17/11/2013 23:15, Mgr. Tomáš Kumpan, Ph.D.
Abstract
In the original language
The Nanbiancun section is exposed in a small hill located close to the Nanbiancun village, about 4 km north-west of Guilin city. Based on the evolution of conodont Siphonodella praesulcata – S. sulcata community, the D/C boundary is placed between beds 55 and 56 in the top of Rongxian Formation. The Ertoucun section is located 7 km south of Guilin in the carbonate platform while the Nanbiancun section is on the marginal slope of the Guilin Platform. In Ertoucun, the upper part of the Famennian (Ertoucun Formation, 0 to 23 m) consists mainly of medium-bedded limestones. The lowermost part of the section (0 to ~11 m) comprises algal wackestones with abundant unilocular and multilocular (quasiendothyrid) foraminifers, peloids, bacterial lumps, ostracods and, in places, fenestral fabric. Peloid-foraminiferal wackestones to packstones with brachiopods, crinoids and algae occur higher up the section (11 to 23 m). A thin layer of shale is observed on the topmost part of the Famennian. The overlying basal Carboniferous Yinggoudong Formation (23 to 31.5 m) consists of thin bedded and/or nodular foraminifer-algal wackestones to packstones with peloids, ostracods, crinoids and brachiopods. Low-field magnetic susceptibility (XLF) measurements reveals: 1) fluctuating, weak and sometimes negative MS values during the Famennian, 2) increasing positive XLF values before the D/C boundary, staying positive up to the basal Carboniferous and 3) decreasing upwards to very weak and negative XLF values. A similar pattern at large-scale is observed in the Nanbiancun section but the GRS peaks and positive XLF values are present in the basal Carboniferous suggesting a clear diachronous detrital signal recorded between the inner platform and marginal slope settings. Sea-level fluctuations and 3rd order systems tracts should probably explain these differences between sections located in the same basin.
Links
| GAP210/11/1891, research and development project |
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