Keywords
color
photography
colorimetry
Arctic
dewatering
oxidation
Section
Abstract
Based on extensive field data (115 sediment cores with a total length of over 300 m), photographic and colorimetric analyses confirm that reduced shelf sediments in the Eastern Arctic region change color and texture much faster and more dramatically than deep-sea sediments. This occurs due to natural dewatering and oxidation processes. Reduced and especially oxidized deep-sea sediments in the Eastern Arctic region remain almost unchanged within 24 hours of sampling and exposure to an oxidizing atmosphere. The changes in reduced shelf sediments primarily consist of significant irreversible yellowing (an increase in the color coordinate CIE b*) and lightening (an increase in the color coordinate CIE L*), accompanied by the disappearance of black hydrotroilite layers, lenses, and patches. The results obtained can be useful for marine geologists, lithologists, and geochemists in supplementing the conventional recommendations for onboard recording of the color and texture of marine sediments in the case of reduced sediments enriched in organic matter.
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