Skip to main content
Fig. 5 | Swiss Journal of Geosciences

Fig. 5

From: Continental weathering as the source of iron in Jurassic iron oolites from Switzerland

Fig. 5

Leached Nd isotope composition vs. leached A Ca/Fe and B Al/Nd ratios. The solid blue lines are linear regressions to the data with calculated coefficients of determination (r2). The linear regression model excluded the clay-dominated sample EE-P23. The dashed black line in B depicts the Al/Nd threshold of ~ 535 as an indication of authigenic Nd isotope signatures (Huang et al., 2021). The lack of correlation between εNd and Ca/Fe suggests that Fe-rich sediment phases (e.g. goethite, chamosite) are not isotopically distinct from Ca-rich phases (e.g. calcite, dolomite). Similarly, the lack of correlation between εNd and Al/Nd suggests that the authigenic phases extracted by leaching are not contaminated by detrital contributions

Back to article page