Geochemical discrimination diagrams and REE patterns of Neoproterozoic and Cambrian sediments: A – after Bhatia (1983), B – after Bhatia and Crook (1986), C – chondrite-normalised REE patterns (normalising values from Sun and McDonough 1989), D – PAAS normalised REE patterns (normalising values from McLennan 1989)
Lower Cambrian continental siliciclastics range from 0.67 to 4.71
and from 0.14 to 0.55, respectively Fig. 4 A).
Chondrite-normalised REE patterns (Fig. 4 C) illustrate a
strong enrichment of the LREE relative to the HREE (average
Three selected samples of the Cadomian sediments have been plotted
in Fig. 4 C to emphasize differences in Eu-anomalies, which
is missing in sample NP2ZbC and distinctly negative in sample
PAAS-normalised REE contents of most samples reveal a slight
depletion of LREE compared to HREE (Fig. 4 D) and a distinct
Using major and trace element data for provenance discrimination, a
back arc setting is confirmed for the Cadomian greywackes
(Fig. 4 AB).
Ranging in the active margin and passive margin fields of
geochemical discrimination diagrams (Fig. 4 A) fits with
strike-slip and rift settings and is in perfect agreement with the
transtensional setting proved by Zulauf et al.
The trace elements of the Lower Cambrian sediments most probably
display an interaction of the island arc signature of the source
rocks and the pattern of the actual transtensional setting
(Fig. 4 B).
The geochemical composition of the Middle Cambrian siliciclastics
overlaps those of the Lower Cambrian and Cadomian sediments
(Fig. 4 A,B), which is attributed to a mixed source and
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