The Zemst borehole, first record of the EECO in the North Sea Basin and implications for Belgian Ypresian - Lutetian stratigraphy
2015; University of Liège; Linguagem: Inglês
ISSN
2034-1954
AutoresÉtienne Steurbaut, Chris King, Johan Matthijs, Corentin Noiret, Johan Yans, Stefaan Van Simaeys,
Tópico(s)Geological Formations and Processes Exploration
Resumo1. IntroductionSeveral cored boreholes have recently been drilled in strategic areas in order to generate and update the geological maps of Belgium. Most of these wells were designed to elucidate regional stratigraphic problems. The Zemst borehole (BGD 73E359; x = 155.444, y = 187.591; GPS-coordinates 50°59’54.52”N, 4°26’46.50”E; Fig. 1) was executed in 2001 to evaluate the presence of the P1n clay in the area between Aalst and Mechelen. This P1n clay, which figures on the old geological maps of Belgium (Anonymous, 1893; Fig. 2), was introduced by Rutot (1890) as part of the Paniselian Stage (now upper part of Ypresian Stage; Steurbaut, 2006a,b) and termed P1(d) or the grey plastic clay (“argile grise plastique”), positioned in between the sandstone bearing P1d sands (“lower Paniselian”) and the overlying Aalter Sands (P2 or “upper Paniselian”). It clearly postdates the P1m clay (Anonymous, 1893), before known as the basal grey plastic clay (“argile grise plastique schistoide de base”) or P1(a) (Rutot, 1890; Fig. 2), and today as Merelbeke Clay.Figure 1. Location of the Zemst borehole and additional borehole and outcrop sections mentioned in the text.Figure 2. Subdivision of the obsolete Paniselian Stage, used until the mid-1950 (e.g. Gulinck & Hacquaert, 1954) (grey shading = not identified).The present study aims at elucidating the stratigraphy of the upper Ypresian and the lower Lutetian in the Zemst area (Fig. 3), with special attention to the Ypresian-Lutetian transition
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