Open AccessU, Th and K in Upper Cretaceous and Tertiary sediments in Denmark
Author(s) -
Michael EngelI Jensen,
Uffe C C Korsbech,
Finn Engstrøm Madsen
Publication year - 1984
Publication title -
bulletin of the geological society of denmark
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.674
H-Index - 28
eISSN - 2245-7070
pISSN - 0011-6297
DOI - 10.37570/bgsd-1983-32-07
Subject(s) - thorium , geology , borehole , cretaceous , sedimentary rock , uranium , mineralogy , paleontology , geochemistry , materials science , metallurgy
The paper presents the results of the measurements of the equivalent equilibrium concentrations of the radioactive elements uranium, thorium, and potassium in about 500 samples of Danish sedimentary rocks from Campanian to Miocene. The results are presented as cross-plots in which each sample has been marked according to its pairwise contents of the radioactive elements. The selected presentation of the results may form a basis of a lithostratigraphical interpretation of the SNG-Iog (Spectral Natural Gamma• ray log) which is a borehole measurement of the equivalent equilibrium concentration of U, Th, and K in the present formations. Some types of sediments contain distinct concentrations of uranium, thorium, and potassium and could easily be identified from a SNG-log. For other sediments the identification cannot be based on the cross-plots alone, but other information has to be included. A SNG-Iog from a borehole penetrating 55 meters of Danian calcarenite is presented as an example of the use of the SNG-log for stratigraphical subdivision and correlation in sediments where other methods would be difficult and time consuming to perform.