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@article{1167420,
author = {Bábek, Ondřej and Kalvoda, Jiří and Cossey, Patrick and Šimíček, Daniel and Devuyst, FrancoisandXavier and Hargreaves, Simon},
article_number = {1},
doi = {http://dx.doi.org/10.1016/j.sedgeo.2012.12.008},
keywords = {Carbonate production;Sequence stratigraphy;Gamma-ray spectrometry;Stratigraphic correlation;Lower Carboniferous},
language = {eng},
issn = {0037-0738},
journal = {Sedimentary Geology},
title = {Facies and petrophysical signature of the Tournaisian/Viséan (Lower Carboniferous) sea-level cycle in carbonate ramp to basinal settings of the Wales-Brabant massif, British Isles},
volume = {284},
year = {2013}
}
TY - JOUR
ID - 1167420
AU - Bábek, Ondřej - Kalvoda, Jiří - Cossey, Patrick - Šimíček, Daniel - Devuyst, Francois-Xavier - Hargreaves, Simon
PY - 2013
TI - Facies and petrophysical signature of the Tournaisian/Viséan (Lower Carboniferous) sea-level cycle in carbonate ramp to basinal settings of the Wales-Brabant massif, British Isles
JF - Sedimentary Geology
VL - 284
IS - 1
SP - 197-213
EP - 197-213
PB - Elsevier Science
SN - 00370738
KW - Carbonate production;Sequence stratigraphy;Gamma-ray spectrometry;Stratigraphic correlation;Lower Carboniferous
N2 - We studied the relationships between stratigraphic distribution of outcrop spectral gamma-ray, magnetic susceptibility and carbonate facies stacking patterns across the regionally significant transgressive–regressive cycle at the Tournaisian/Viséan boundary (Tn/V, early Carboniferous) in southern Great Britain and Ireland (South Wales, North Staffordshire and Dublin Basin). The Tn/V boundary coincides with a prominent climatic pulse connected with the Late Paleozoic glaciation of Gondwana. The aim was to correlate the gamma-ray and magnetic susceptibility log patterns in carbonate ramp- and basin settings and discuss the global/regional nature and magnitude of this transgressive–regressive cycle. A robust ramp-to-basin correlation was produced based on the log patterns, facies stacking patterns and foraminifer biostratigraphy. The concentrations of K and Th, the “clay” gamma-ray values and, partly, magnetic susceptibility are dependent on facies and show systematic changes along the inferred bathymetric profile from inner ramp to outer ramp and basin. A model of carbonate productivity-driven dilution of fine-grained siliciclastics in CaCO3 as the major control on the petrophysical patterns is discussed. The cleaning-up and cleaning-down petrophysical trends are related to down-dip and up-dip shifts of the carbonate factory with changing relative sea level. In middle-to-outer ramp and basin settings, this generates petrophysical trends just opposite to Paleozoic carbonate shelves where peaks in magnetic susceptibility are known to be associated with peak regressions. A distinct, late Tournaisian to early Viséan regressive-to-transgressive cycle with a prominent sequence boundary located close to the Tn/V stage boundary can be seen in the sections. Glacioeustatic origin of the sequence boundary is inferred from its correlation with Tn/V boundary sections from Europe, carbon isotope data from South China and the glacial deposits in the southern hemisphere mentioned by previous authors.
ER -
BÁBEK, Ondřej, Jiří KALVODA, Patrick COSSEY, Daniel ŠIMÍČEK, Francois-Xavier DEVUYST a Simon HARGREAVES. Facies and petrophysical signature of the Tournaisian/Viséan (Lower Carboniferous) sea-level cycle in carbonate ramp to basinal settings of the Wales-Brabant massif, British Isles. \textit{Sedimentary Geology}. Elsevier Science, 2013, roč.~284, č.~1, s.~197-213. ISSN~0037-0738. Dostupné z: https://dx.doi.org/10.1016/j.sedgeo.2012.12.008.
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