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Dating errors in high-resolution stratigraphy: a detailed X-ray radiograph and AMS- 14 C study of Zoophycos burrows by Ludvig Löwemark; Friedrich Werner is a Earth and Planetary Sciences article available to read on EtoBox.

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Bioturbation in oxic deep-sea settings is often considered (if considered at all) to consist of a 2±10 cm thick homogenized layer and some easily recognizable distinct burrows which could be avoided when sub-sampling the sediment cores. However, there is one trace that is often dif®cult to discern in unlithi®ed sediments, that manifests transport of considerable amounts of sediment over large vertical distances, and that is widely spread in deep-sea sediments in all oceans. This trace, Zoophycos, is therefore predestined to cause errors and even age reversals in high-resolution dating. In order to better estimate the size of these age errors, we have performed AMS-14 C dating of the trace itself and of directly surrounding material in two gravity cores from the Portuguese continental slope. The results show an age falsi®cation of 1110±2525 years at sedimentation rates of 10± 20 cm ka 21 . Since Zoophycos burrows are often poorly or not at all visible in fresh cores, all observations of Zoophycos were made on X-ray radiographs. To avoid dating errors of this kind, an X-ray radiograph study prior to sub-sampling is strongly recommended.

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Author

Ludvig Löwemark; Friedrich Werner

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0025-3227)

Published

2001

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)