Iron sulfides and anomalous electrical resistivity in cratonic environments: electrical resistivity data set

The interpretation of low-resistivity anomalies in the lithospheric mantle of several cratonic regions has invoked hydrogen, or connected networks of graphite with iron-rich silicates, and/or metal sulfides. Electrical laboratory measurements are a powerful approach for exploring these alternatives.

We report electrical measurements of two xenoliths (pyroxenite and dunite) from Tanzania; two metal sulfides (FeS and Fe-S-Ni); and several mixtures of metal sulfides (3.4–18.2 vol.%) with xenolith. A multi- anvil press was employed to maintain a 2 GPa pressure and temperatures up to 1,627 K. The addition of 3.4 vol.% FeS to the pyroxenite or dunite matrix has little effect on bulk resistivity, particularly for T > 800 K. However, the resistivity drops dramatically–by factors of up to 1,000, depending on temperature– upon addition of 6.5 vol.% FeS in the dunite. Addition of 18.2% FeS causes a further decrease of the same magnitude relative to the 6.5% sample. Scanning electron microsco...