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Geological Society, London, Special Publications; 1991; v. 57; p. 251-262;
DOI: 10.1144/GSL.SP.1991.057.01.19
© 1991 Geological Society of London

An integrated approach to provenance studies: a case example from the Upper Jurassic of the Central Graben, North Sea

Bernard Humphreys1,3, Andrew C. Morton1, Claire R. Hallsworth1, Robert W. Gatliff2 & James B. Riding1

1 British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
2 British Geological Survey, 19 Grange Terrace, Edinburgh EH9 2LF, UK
3 Lemigas, P. O. Box 1089/Jkt., Cipulir-Kebayoran Lama, Jakarta 12230, Indonesia

The provenance of Upper Jurassic sandstones in a small half graben in the southern Central Graben of the North Sea has been investigated by studying a range of parameters: the composition of feldspars, the nature of rock fragments and their cathodoluminescence properties, heavy mineral assemblages, clay mineral assemblages, whole rock geochemistry and the occurrence of reworked palynomorphs. The combined result of these investigations is that rocks of Triassic, Permian and Carboniferous age are believed to have supplied detritus to the Upper Jurassic basin and to have diluted the contemporaneous bioclastic deposits. However, each individual provenance indicator tended to emphasize the importance of one particular source. Only an integrated study provided a complete picture of the interplay of different sources during deposition. Such integrated studies also identify the limitations of individual provenance indicators, in particular the adverse role of burial diagenesis in the removal of diagnostic grains such as volcanic feldspars and certain heavy mineral grains.