| BÁBEK, Ondřej, Jiří KALVODA, Maecus ARETZ, Patrick COSSEY, Francois-Xavier DEVUYST, Hans-Georg HERBIG a George SEVASTOPULO. THE CORRELATION POTENTIAL OF MAGNETIC SUSCEPTIBILITY AND OUTCROP GAMMA-RAY LOGS AT TOURNAISIAN-VISÉAN BOUNDARY SECTIONS IN WESTERN EUROPE. Geologica Belgica. Bruxelles: Geologica Belgica, 2010, roč. 13, č. 4, s. 291-308, 17 s. ISSN 1374-8505. |
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@article{932222,
author = {Bábek, Ondřej and Kalvoda, Jiří and Aretz, Maecus and Cossey, Patrick and Devuyst, FrancoisandXavier and Herbig, HansandGeorg and Sevastopulo, George},
article_location = {Bruxelles},
article_number = {4},
keywords = {Outcrop logging techniques; foraminifer biostratigraphy; Carboniferous; deep-marine sediments; sealevel},
language = {eng},
issn = {1374-8505},
journal = {Geologica Belgica},
title = {THE CORRELATION POTENTIAL OF MAGNETIC SUSCEPTIBILITY AND OUTCROP GAMMA-RAY LOGS AT TOURNAISIAN-VISÉAN BOUNDARY SECTIONS IN WESTERN EUROPE},
volume = {13},
year = {2010}
}
TY - JOUR
ID - 932222
AU - Bábek, Ondřej - Kalvoda, Jiří - Aretz, Maecus - Cossey, Patrick - Devuyst, Francois-Xavier - Herbig, Hans-Georg - Sevastopulo, George
PY - 2010
TI - THE CORRELATION POTENTIAL OF MAGNETIC SUSCEPTIBILITY AND OUTCROP GAMMA-RAY LOGS AT TOURNAISIAN-VISÉAN BOUNDARY SECTIONS IN WESTERN EUROPE
JF - Geologica Belgica
VL - 13
IS - 4
SP - 291-308
EP - 291-308
PB - Geologica Belgica
SN - 13748505
KW - Outcrop logging techniques
KW - foraminifer biostratigraphy
KW - Carboniferous
KW - deep-marine sediments
KW - sealevel
N2 - We have measured five deep-water carbonate and carbonate-siliciclastic sections at the Tournaisian-Viséan (Tn/V) boundary in western Europe, using petrophysical outcrop logging techniques (gamma-ray spectrometry /GRS/ and magnetic susceptibility /MS/). The aim was to trace correlatable log patterns across the flanks of the London-Brabant Massif from eastern Ireland to western Germany. Both GRS and MS logging proved useful for long-distance (up to ~1000 km) correlation. The log patterns can be interpreted in terms of sea-level fluctuations. A late Tournaisian regression, a sequence boundary at the Tn/V boundary, early Viséan lowstand systems tract and an overlying transgressive to regressive succession can be identified from the GRS and MS logs. The Tn/V sequence boundary can be correlated with exposure features and karstic surfaces in the up-dip shallow-water settings at the boundary between sequence 4 and 5 of Hance et al. (2001, 2002). This indicates that sea-level fluctuations around the Tn/V boundary were synchronous and traceable on the flanks of the London-Brabant Massif. The GRS-based logging has a greater correlation potential than MS as it can be applied in a broad spectrum of facies and depositional settings. In certain sections, the MS signal shows an increasing trend during transgression and a decreasing during regression, which is opposite to the MS paradigm from shallow-water carbonate platform settings. These trends are assumed to result from landward/basinward facies shifts of a low-productivity carbonate ramp system. Lowstand shedding of carbonate tempestites and turbidites results in low MS values while during sea-level rise the ramp systems backstep, developing a retrograding facies succession in its distal parts, which is associated with upward-increasing MS values.
ER -
BÁBEK, Ondřej, Jiří KALVODA, Maecus ARETZ, Patrick COSSEY, Francois-Xavier DEVUYST, Hans-Georg HERBIG a George SEVASTOPULO. THE CORRELATION POTENTIAL OF MAGNETIC SUSCEPTIBILITY AND OUTCROP GAMMA-RAY LOGS AT TOURNAISIAN-VISÉAN BOUNDARY SECTIONS IN WESTERN EUROPE. \textit{Geologica Belgica}. Bruxelles: Geologica Belgica, 2010, roč.~13, č.~4, s.~291-308, 17 s. ISSN~1374-8505.
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