The upper Dja
series consists of carbonates and shales deposits that date 580 ± 150 Ma.
Petrography and mineral chemistry studies helped to differentiate this series
into many sequences including massive limestone layers with calcite (CaO3)
contents of about 30 to 42%.
In order to
determine the subsurface distribution of these sequences, a geophysical
prospection campaign was carried out in which a total of 24 vertical
resistivity soundings were recorded over a surface area
of 9 km2.
The processing
and interpretation of data using the IX1D and OpendTect modeling tools
permitted the distinction of two massive limestone layers in the upper Dja
series.
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