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Abstract
Journal of Sedimentary Research, Section
B: Stratigraphy and Global Studies
Vol. 67 (1997)No.
4. (July), Pages 676-685
Resolving Sedimentological Uncertainties Using Magnetostratigraphic Correlation:
An Example from the Middle Jurassic of Burgundy, France
Kifaya N. Belkaaloul (1), Djafar M. Aissaoui (1), Michel
Rebelle (2), Gerard Sambet (3)
ABSTRACT
Magnetostratigraphic analysis was undertaken on a core 85 m long core from
the shallow-water carbonate platform of Bathonian to late Callovian age
in Burgundy, France, to establish high-resolution magnetic correlations
in a succession devoid of good stratigraphic markers and with diachronous
lithofacies. Magnetic extracts reveal that the magnetic minerals carrying
the characteristic remanence are mainly detrital titanomagnetites and fine-grained
biogenic magnetite of probable bacterial origin. Comparison of magnetic
properties with lithologic data from wireline logs indicates that large
grains are predominant in marly deposits whereas fine-grained minerals
are common mainly in pure limestones. We have established a polarity sequence
for the core that is independent of lithology and in ludes 17 polarity
zones. With the help of faunal zonation based on brachiopods and ammonites,
the polarity sequence was compared with the magnetostratigraphy established
previously in four other sections from the same area. The magnetostratigraphic
correlation corroborates that platform flooding occurred during the early
Callovian, an age in agreement with biostratigraphic interpretation constraining
the age of successive onlaps.
A characteristic reverse polarity interval within the ammonite Calloviense
subzone is present in all the cores, confirming the utility of magnetostratigraphy
for stratigraphic correlation studies throughout the Paris Basin and Burgundy.
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