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

Swiss Journal of Geosciences

Table 3 Strontium isotope compositions for the reductive leachates of iron oolites

Sample	Age (Ma)	⁸⁷Sr/⁸⁶Sr (measured)	2 SEM	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr (initial)	2 SD
H1	163	0.707336	0.000010	0.0077	0.707318	0.000013
H2	172	0.707266	0.000011	0.0017	0.707262	0.000013
WG1	167	0.712245	0.000012	0.0036	0.712237	0.000013
WG3	167	0.711407	0.000010	0.0018	0.711402	0.000013
EE-P6	165	0.709685	0.000010	0.0015	0.709682	0.000013
EE-P9	165	0.709657	0.000008	0.0600	0.709518	0.000019
EE-P12	165	0.709360	0.000009	0.0005	0.709359	0.000013
EE-P18	165	0.709722	0.000010	0.0003	0.709721	0.000013
EE-P20	165	0.709486	0.000009	0.0003	0.709486	0.000013
EE-P22	165	0.709700	0.000009	0.0002	0.709700	0.000013
EE-P26	165	0.709159	0.000010	0.0006	0.709158	0.000013
EE-P28	165	0.709521	0.000010	0.0003	0.709520	0.000013
EE-P30	165	0.709093	0.000009	0.0040	0.709084	0.000013
EE-P31	165	0.709558	0.000010	0.0122	0.709530	0.000013
EE-P32	165	0.709320	0.000010	0.0392	0.709229	0.000016
EE-P33	165	0.709914	0.000010	0.0304	0.709844	0.000015

Uncertainties on the measured isotope ratios reflect internal errors of the mass spectrometric runs (2 SEM). Uncertainty on the initial ratios combine uncertainties in the age correction with an external error estimate of the measured ⁸⁷Sr/⁸⁶Sr ratios (Sect. 3)