Sedimentology and magnetic susceptibility of Mississippian (Tournaisian) carbonate sections in Belgium

Abstract

Magnetic susceptibility (MS) and biostratigraphy have been used to correlate better the reference sections of the Belgian Tournaisian, the Rivage road and railway sections and the Gendron-Celles railway section. These 200 m thick time-equivalent sections are about sixty kilometres apart and belong to two different sedimentation areas: a shallow ramp setting for Rivage (Condroz Sedimentation Area) and a subsiding area for Gendron (Dinant Sedimentation Area). The sedimentological model shows that both sections are characterized by a carbonate-dominated sedimentation (crinoids-peloids-algae assemblages), interrupted by more argillaceous facies related to rapid sea-level rises (crinoids-brachiopods-bryozoans assemblages). Accommodation space was significantly higher in the DSA and allowed the development of Waulsortian buildups during the Ivorian. Variations of magnetic susceptibility (MS) seem to be related to fluctuations in detrital input and carbonate productivity. MS evolution with palaeogeography can be integrated in the previously published model for the Devonian ramp system: external ramp settings have low carbonate productivity, low water agitation and high MS, whereas more proximal environments are characterized by higher carbonate productivity, higher water agitation and lower MS. MS curves are in general agreements with the 3 rd -order sequence interpretation. Lowstand system tracts (LST) show the highest MS values while transgressive system tracts (TST) are characterized by decreasing values and highstand system tracts/falling stage system tracts (HST/FSST) by the lowest values.•

Magnetic susceptibility and facies relationship in Bajocian–Bathonian carbonates from the Azé caves, southeastern Paris Basin, France

“…The relationship between facies and MS on carbonate and ramp models has already been studied on the Tournaisian of China (Zhang et al 2000) and Belgium (Bertola et al 2013), on the Devonian of Belgium (Mabille & Boulvain 2007;Da Silva et al 2009a) and Germany (Mabille et al 2008), and on the Tournaisian and Early Visean in Western Europe (Ba ´bek et al 2010) and of South Whales (Ba ´bek et al 2013). On the Devonian carbonate platform (Da Silva et al 2009a, b), the MS signal is influenced by siliciclastic input (e.g.…”

“…MS values are higher in the outer ramp, where water agitation and carbonate production are the lowest, allowing magnetic particles to settle out. Mabille et al (2008) and Bertola et al (2013)…”

The Hondelange Formation and the sequence stratigraphic model of Belgian Lorraine

“…No special effect of the system tract nature is observed: the different sequences (1-4) being characterized by close and consistent MS levels for TST's and HST's. This is barely the case for Paleozoic carbonates where LST's systematically show high values while TST's are characterized by decreasing values and HST's by the lowest values (Da Silva & Boulvain, 2006;Bertola et al, 2013). However, in Belgian Lorraine, MS varies from one depositional sequence to the other, decreasing from sequence 1 to 3 and increasing with sequence 4.…”

Sedimentation Dynamics of the Lower Part of Sentolo Formation at Niten Stream Traverse, Girimulyo, West Progo

“…Based on the results of observations and measurements at Niten traverse, Sentolo Formation laid conformably on Old Andesite Formation (Table 1) and generally consists of bedded limestone and tuff sandstone. The sedimentary rock which were dominated by carbonate rocks with intercalation of argillaceous facies is associated with rapid sea level rise [15]. Table 2).…”