Comparison of geochemical indices used for the interpretation of palaeoredox conditions in ancient mudstones

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doi: 10.1016/0009-2541(94)90085-X
Authors:Jones, Bryn; Manning, David A. C.
Author Affiliations:Primary:
University of Newcastle, Fossil Fuels and Environmental Geochemistry (Post Graduate Institute), Newcastle-upon-Tyne, United Kingdom
Other:
University of Manchester, Manchester, United Kingdom
Volume Title:Chemical Geology
Source:Chemical Geology, 111(1-4), p.111-129. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541
Publication Date:1994
Note:In English. Includes appendix. 64 refs.; illus. incl. chart, 5 tables, sketch map
Summary: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.
Subjects:Actinides; Calibration; Carbon; Chromium; Clastic rocks; Cobalt; Depositional environment; Eh; Geochemistry; Heather Formation; Interpretation; Jurassic; Kimmeridge Clay; Mesozoic; Metals; Metasomatism; Molybdenum; Mudstone; Nickel; Oxygen; Pyritization; Sedimentary rocks; Sulfur; Thorium; Upper Jurassic; Uranium; Vanadium; Zinc; Atlantic Ocean; England; Europe; Great Britain; North Atlantic; North Sea; Norway; Scandinavia; United Kingdom; Western Europe; Draupne Formation; European Atlantic
Abstract Numbers:94M/4532
Record ID:1994017197
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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