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

(2014) GEOLOGICA BELGICA. 17(2). p.161-174
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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 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 dinoilagellate 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
Tortonian, Glauconite reworking, Campine, Hageland, paleogeography, NORTH-SEA BASIN, DINOFLAGELLATE CYST BIOSTRATIGRAPHY, DEPOSITIONAL HISTORY, SOUTHERN BORDER, STRATIGRAPHY, MIDDLE, NEOGENE, SANDS

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Citation

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Chicago
Vandenberghe, Noël, W Burleigh Harris, JM Wampler, Rik Houthuys, Stephen Louwye, Rieko Adriaens, Koen Vos, et al. 2014. “The Implications of K-Ar Glauconite Dating of the Diest Formation on the Paleogeography of the Upper Miocene in Belgium.” Geologica Belgica 17 (2): 161–174.
APA
Vandenberghe, Noël, Harris, W. B., Wampler, J., Houthuys, R., Louwye, S., Adriaens, R., Vos, K., et al. (2014). The implications of K-Ar glauconite dating of the Diest Formation on the paleogeography of the Upper Miocene in Belgium. GEOLOGICA BELGICA, 17(2), 161–174.
Vancouver
1.
Vandenberghe N, Harris WB, Wampler J, Houthuys R, Louwye S, Adriaens R, et al. The implications of K-Ar glauconite dating of the Diest Formation on the paleogeography of the Upper Miocene in Belgium. GEOLOGICA BELGICA. 2014;17(2):161–74.
MLA
Vandenberghe, Noël, W Burleigh Harris, JM Wampler, et al. “The Implications of K-Ar Glauconite Dating of the Diest Formation on the Paleogeography of the Upper Miocene in Belgium.” GEOLOGICA BELGICA 17.2 (2014): 161–174. Print.
@article{5784605,
  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 dinoilagellate 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.},
  author       = {Vandenberghe, No{\"e}l and Harris, W Burleigh and Wampler, JM and Houthuys, Rik and Louwye, Stephen and Adriaens, Rieko and Vos, Koen and Lanckacker, Timothy and Matthijs, Johan and Deckers, Jef and Verhaegen, Jasper and Laga, Piet and Westerhoff, Wim and Munsterman, Dirk},
  issn         = {1374-8505},
  journal      = {GEOLOGICA BELGICA},
  language     = {eng},
  number       = {2},
  pages        = {161--174},
  title        = {The implications of K-Ar glauconite dating of the Diest Formation on the paleogeography of the Upper Miocene in Belgium},
  url          = {http://popups.ulg.ac.be/1374-8505/index.php?id=4553},
  volume       = {17},
  year         = {2014},
}

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