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Geological Society, London, Special Publications; 1989; v. 46; p. 221-228;
DOI: 10.1144/GSL.SP.1989.046.01.19
© 1989 Geological Society of London

Case Studies

The origin of the Lower Jurassic Cleveland Ironstone Formation of North-East England: evidence from portable gamma-ray spectrometry

K. J. Myers

Department of Geology, Imperial College, London, UK
BP Sunbury Research Centre, Sunbury-on-Thames, Middlesex, UK

The distribution of K, U and Th in the Cleveland Ironstone Formation, measured by gamma-ray spectrometry, is found to be useful in investigating the origin of oolitic ironstones. The oolitic ironstone seams are enriched in Th and depleted in K relative to the interbedded mudstones which show a close correlation between Th and K. The enrichment of Th in the ironstone seams represents a primary depositional rather than a diagenetic process, and the Th-enriched material must have been transported to the site of ironstone deposition from elsewhere. The values of Th (20–45 ppm) and the Th/K ratios (20–100) recorded in the ironstone seams are consistent with the original Th-enriched material being kaolinitic/bauxitic clay from a lateritic weathering source.





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D. N. Parkinson
Gamma-ray spectrometry as a tool for stratigraphical interpretation: examples from the western European Lower Jurassic
Geological Society, London, Special Publications, 1996; 103: 231 - 255.
[Abstract] [PDF]