Identification of primary Ce-anomaly signatures in fossil biogenic apatite: implication for the Cambrian oceanic anoxia and phosphogenesis

Based on REE analyses of 105 world-wide distributed Cambrian fossil apatite samples and eight late Neoproterozoic phosphate concretions, a close relationship is established between the concentrations of MREE and Ce anomalies. Shale La/Sm N ratios of 0.35 is suggested as a critical value for the disc...

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Bibliographic Details
Published in:Sedimentary geology 2001-09, Vol.143 (3), p.259-264
Main Authors: Morad, S., Felitsyn, S.
Format: Article
Language:English
Subjects:
Apatite
Cambrian
Marine
Oceanic anoxia
Precambrian
REE
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Summary:Based on REE analyses of 105 world-wide distributed Cambrian fossil apatite samples and eight late Neoproterozoic phosphate concretions, a close relationship is established between the concentrations of MREE and Ce anomalies. Shale La/Sm N ratios of 0.35 is suggested as a critical value for the discrimination of the natural Ce anomaly acquired during pre-burial/early diagenesis by biogenic apatite from an artificial Ce anomaly induced due to the calculation. Ce anomalies in apatites with flat REE distribution and La/Sm N ratio >0.35 may be used as indicative of oceanic anoxia.
ISSN:0037-0738
1879-0968
DOI:10.1016/S0037-0738(01)00093-8