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Title: The implications of K-Ar glauconite dating of the Diest Formation on the paleogeography of the Upper Miocene in Belgium
Authors: Vandenberghe, Noël ×
Harris, W. Burleigh
Wampler, J.M.
Houthuys, Rik
Louwye, Steven
Adriaens, Rieko
Vos, Koen
Lanckacker, Timothy
Matthijs, Johan
Deckers, Jef
Verhaegen, Jasper
Laga, Piet
Westerhoff, Wim
Munsterman, Dirk #
Issue Date: 2014
Publisher: Université de Liège
Series Title: Geologica Belgica vol:17 issue:2 pages:161-174
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 into a 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.
ISSN: 1374-8505
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division of Geology
× corresponding author
# (joint) last author

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