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Comparison of Geochemical Indexes for the Interpretation of Palaeoredox COnditions in Ancient Mudstones

Lookup NU author(s): Professor David ManningORCiD


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Eight geochemical indices used for the interpretation of bottom water palaeo-oxygen concentrations for argillaceous sedimentary rocks have been calculated for a suite of Upper Jurassic mudstones drawn from the Draupne and Heather Formations of the Norwegian North Sea, and the Kimmeridge Clay Formation from onshore England. The eight indices: DOP, C/S, U/Th, authigenic uranium, V/Cr, Ni/Co, Ni/V and (Cu+Mo)/Zn have been examined by means of factor analysis, to identify the most reliable. DOP, U/Th, authigenic uranium, V/Cr and Ni/Co form an internally consistent set and are recommended as the most reliable of the indices. Ni/V, C/S and (Cu+Mo)/Zn convey little palaeo-oxygenation information and are not regarded as reliable. The parameters identified as reliable (DOP, Ni/Co, V/Cr, U/Th and authigenic uranium), have been calibrated against DOP, for inter-comparison purposes, and to allow their interpretation against DOP-derived depositional conditions.

Publication metadata

Author(s): Jones B, Manning DAC

Publication type: Article

Publication status: Published

Journal: Chemical Geology

Year: 1994

Volume: 111

Issue: 1-4

Pages: 111-129

Print publication date: 01/01/1994

ISSN (print): 0009-2541

ISSN (electronic): 1872-6836

Publisher: Elsevier BV