--> Abstract: Development of the Permian-Triassic Sequence in the Basin Fringe Area, Southern Netherlands, by M. Geluk, D. Van Doorn, A. Plomp, and E. Duin; #90990 (1993).

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GELUK, MARK, DICK VAN DOORN, ARNY PLOMP, and ED DUIN, Geological Survey of the Netherlands, Haarlem, Netherlands

ABSTRACT: Development of the Permian-Triassic Sequence in the Basin Fringe Area, Southern Netherlands

Geological studies in the fringe area of the southern Permian basin led to new insights in the distribution and development of the Permian-Triassic sequence. During the Permian, the fringe area formed a platform, attached to the London-Brabant Massif, while during the Triassic it is characterized by strongly subsiding half grabens.

In the southern Netherlands, Rotliegende sandstones and conglomerates have a much wider distribution than previously recognized. The Rotliegende deposits are capped by claystones and carbonates of the Upper Permian Zechstein.

In the offshore, an important feeder system of clastics from the London-Brabant Massif was active during deposition of the Rotliegende and the Zechstein. In course of time, the location of major sandstone deposition shifted westward.

Deposition of the Triassic Buntsandstein was controlled by the development of a large feeder system, which transported clastics from the Vosges northward, through the Roer Valley Graben and West Netherlands Basin into the Off Holland Low. This system was responsible for the deposition of the economically important sheet sandstones of the Volpriehausen, Detfurth, Hardegsen, and Solling formations. A regional unconformity occurs below the Solling Formation. The sandstones are capped by claystones, evaporites, and sandstones of the Rot Formation.

During deposition of the Muschelkalk, the differences in subsidence decreased and shallow marine sediments are interbedded with evaporites.

Several unconformities occur within the Keuper. In the previous half grabens in the southern Netherlands, the Keuper is incomplete, which may be indicative for a possible reversal of the tectonic movements during this period.

AAPG Search and Discovery Article #90990©1993 AAPG International Conference and Exhibition, The Hague, Netherlands, October 17-20, 1993.