Abstract
The Upper Permian Zechstein succession of southern Jylland, Denmark, is composed of a cyclic repetition of carbonate, anhydrite and salt, and includes four main carbonate units: Ca-la, Ca-lb, Ca-2 and Ca-3. The stratigraphy and log-correlation in the southern Jylland area is outlined and compared to other areas. Descriptions of facies and interpretation of depositional models for the four carbonate units are presented. The depositional system comprised a shelf with marginal sabkha evaporites and carbonates; the shelf underwent evolution from a ramp-like to a platform configuration. This evolution is seen as the result of the interplay between evaporite and carbonate sedimentation. Accumulation of sulphate evaporites during Z-1 times produced a sediment body with a platform morphology. Z-2 carbonate deposition further enhanced the platform configuration, with consequent development of a marked zonation of facies according to energy level. Later in Z-2 time the platform - basin system suffered demise as the basinal areas were filled with halite and during the remaining period of basinal history shallow water conditions prevailed throughout the area.
Highlights
During the early 1950's and 1980's the Zechstein carbonates in southern Jylland formed a major target in the exploration for hydrocarbons within onshore Denmark
During Zechstein time southern Jylland was situated along the southern slope of the Ringk0bing-Fyn High, which at that time formed the northern margin of this southern salt basin known as the NW German Basin
In accordance with a position along the northern margin of the southern Zechstein Basin, shallow-water carbonates dominate in the northern part of the investigated area while deeper water, outer ramp and base of slope facies dominate in the T0nder Trough to the south during deposition of Ca-la and
Summary
During the early 1950's and 1980's the Zechstein carbonates in southern Jylland formed a major target in the exploration for hydrocarbons within onshore Denmark. During Zechstein time southern Jylland was situated along the southern slope of the Ringk0bing-Fyn High, which at that time formed the northern margin of this southern salt basin known as the NW German Basin The complex of blocks and north-south trending transecting troughs making up the Ringk0bing-Fyn High was probably formed during Stephanian-Autunian times as a result of late Variscian right lateral wrench tectonics (Ziegler 1982). These Late Carboniferous to Early Permian wrench movements were associated with the development of a complex array of conjugate shear faults and pull-apart structures.
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