Geologica Belgica

1374-8505 2034-1954

 

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Noël VANDENBERGHE, W. Burleigh HARRIS, J.M. WAMPLER, Rik HOUTHUYS, Stephen LOUWYE, Rieko ADRIAENS, Koen VOS, Timothy LANCKACKER, Johan MATTHIJS, Jef DECKERS, Jasper VERHAEGEN, Piet LAGA, Wim WESTERHOFF & Dirk MUNSTERMAN

The implications of K-Ar glauconite dating of the Diest Formation on the paleogeography of the Upper Miocene in Belgium.

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Abstract

The glauconite-rich Diest Formation in central and north Belgium contains sands in the Campine subsurface and the hilly Hageland area that can be distinguished from each other. The Hageland Diest Sands member contains no stratigraphically relevant fossils while in the Campine subsurface dinoflagellate cysts are common and show a stratigraphic range covering the entire Tortonian stage. K-Ar dates were determined for glauconite from 13 selected samples spread over both areas. A glauconite date corresponding to the earliest Tortonian indicates newly formed glauconite was incorporated intoa greensand at the base of the Diest Formation in the central Campine area. All other dates point at reworked glauconite and can be organized in two groups, one reflecting a Burdigalian age and another reflecting a Langhian age. These data and the thickness and glauconite content of the Diest Formation imply massive reworking of older Miocene deposits.

The paleogeographic implications of these data lead to the tentative recognition of two Tortonian sedimentary sequences. An older one corresponding to dinoflagellate biochron DN8 comprises the Deurne Member, part of the Dessel Member, the Hageland Diest member, the eastern Campine Diest member and some basal sands of the Diest Formation in the central Campine. A younger sequence corresponding to dinoflagellate biochrons DN9 and 10 was strongly influenced by the prograding proto-Rhine delta front in the Roer Valley Graben to the northeast. The subsiding Campine basin was filled from east to west during this second cycle.

Keywords : Glauconite reworking, Tortonian, Campine, Hageland, paleogeography

To cite this article

Noël VANDENBERGHE, W. Burleigh HARRIS, J.M. WAMPLER, Rik HOUTHUYS, Stephen LOUWYE, Rieko ADRIAENS, Koen VOS, Timothy LANCKACKER, Johan MATTHIJS, Jef DECKERS, Jasper VERHAEGEN, Piet LAGA, Wim WESTERHOFF & Dirk MUNSTERMAN, «The implications of K-Ar glauconite dating of the Diest Formation on the paleogeography of the Upper Miocene in Belgium.», Geologica Belgica [En ligne], volume 17 (2014), number 2, URL : http://popups.ulg.ac.be/1374-8505/index.php?id=4553.

About: Noël VANDENBERGHE

Department Earth and Environmental Sciences, Katholieke Universiteit, Leuven, Belgium. E-mail: Noel.Vandenberghe@ees.kuleuven.be

About: W. Burleigh HARRIS

North Carolina Geological Survey, MSC 1620, Raleigh, NC 27699, USA. E-mail: harrisw@uncw.edu  

About:  J.M. WAMPLER

Department of Geosciences, Georgia State University, Atlanta, GA 30303, USA. E-mail: claylab@gsu.edu

About: Rik HOUTHUYS

Geoconsultant, Halle, Belgium. E-mail: rik.houthuys@telenet.be  

About: Stephen LOUWYE

Research Unit Palaeontology, Ghent University, Belgium. E-mail: Stephen.Louwye@UGent.be

About: Rieko ADRIAENS

Department Earth and Environmental Sciences, Katholieke Universiteit, Leuven, Belgium.

About: Koen VOS

Department Earth and Environmental Sciences, Katholieke Universiteit, Leuven, Belgium.

About: Timothy LANCKACKER

VITO, Flemish Institute for Technological Research, Mol, Belgium.

About: Johan MATTHIJS

VITO, Flemish Institute for Technological Research, Mol, Belgium.

About: Jef DECKERS

VITO, Flemish Institute for Technological Research, Mol, Belgium, E-mail: jef.deckers@vito.be

About: Jasper VERHAEGEN

Department Earth and Environmental Sciences, Katholieke Universiteit, Leuven, Belgium.

About: Piet LAGA

Belgian Geological Survey,  Brussels, Belgium. E-mail: Piet.laga@skynet.be

About: Wim WESTERHOFF

Geological Survey of the Netherlands-TNO, Utrecht, the Netherlands. E-mail: wim.westerhoff@tno.nl

About: Dirk MUNSTERMAN

Geological Survey of the Netherlands-TNO, Utrecht, the Netherlands. E-mail: dirk.munsterman@tno.nl