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SEDIMENTOLOGICAL EVOLUTION AND SEDIMENTOLOGICAL EVOLUTION AND NATURAL RADIOACTIVITY OF TERTIARY SEDIMENTS FROM THE CENTRAL NORTH SEA
Author(s) -
Berstad S.,
Dypvik H.
Publication year - 1982
Publication title -
journal of petroleum geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 42
eISSN - 1747-5457
pISSN - 0141-6421
DOI - 10.1111/j.1747-5457.1982.tb00561.x
Subject(s) - pyroclastic rock , geology , silt , volcano , debris , geochemistry , north sea , paleontology , fraction (chemistry) , mineralogy , oceanography , chemistry , organic chemistry
In the North Sea well studied in this paper, the radioactive isotopes of U, Th and K are shown to control the variations in the gamma‐log response. Th and K are associated with the clay fraction, while U is enriched in the silt fraction. In the volcaniclastic Palaeocene and Eocene beds, low gamma activity is due to a high content of volcanic debris poor in U and Th, while higher gamma activity in the younger beds indicates the decrease in volcaniclastic material.