2010
THE CORRELATION POTENTIAL OF MAGNETIC SUSCEPTIBILITY AND OUTCROP GAMMA-RAY LOGS AT TOURNAISIAN-VISÉAN BOUNDARY SECTIONS IN WESTERN EUROPE
BÁBEK, Ondřej, Jiří KALVODA, Maecus ARETZ, Patrick COSSEY, Francois-Xavier DEVUYST et. al.Základní údaje
Originální název
THE CORRELATION POTENTIAL OF MAGNETIC SUSCEPTIBILITY AND OUTCROP GAMMA-RAY LOGS AT TOURNAISIAN-VISÉAN BOUNDARY SECTIONS IN WESTERN EUROPE
Název česky
THE CORRELATION POTENTIAL OF MAGNETIC SUSCEPTIBILITY AND OUTCROP GAMMA-RAY LOGS AT TOURNAISIAN-VISÉAN BOUNDARY SECTIONS IN WESTERN EUROPE
Autoři
BÁBEK, Ondřej (203 Česká republika, garant), Jiří KALVODA (203 Česká republika, domácí), Maecus ARETZ (276 Německo), Patrick COSSEY (826 Velká Británie a Severní Irsko), Francois-Xavier DEVUYST (56 Belgie, domácí), Hans-Georg HERBIG (276 Německo) a George SEVASTOPULO (372 Irsko)
Vydání
Geologica Belgica, Bruxelles, Geologica Belgica, 2010, 1374-8505
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10500 1.5. Earth and related environmental sciences
Stát vydavatele
Belgie
Utajení
není předmětem státního či obchodního tajemství
Impakt faktor
Impact factor: 0.645
Kód RIV
RIV/00216224:14310/10:00049334
Organizační jednotka
Přírodovědecká fakulta
UT WoS
000285908500002
Klíčová slova česky
Outcrop logging techniques; foraminifer biostratigraphy; Carboniferous; deep-marine sediments; sealevel
Klíčová slova anglicky
Outcrop logging techniques; foraminifer biostratigraphy; Carboniferous; deep-marine sediments; sealevel
Změněno: 11. 7. 2011 11:48, prof. RNDr. Jiří Kalvoda, CSc.
V originále
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.
Česky
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.
Návaznosti
| GA205/08/0182, projekt VaV |
|