Induced polarization of seafloor massive sulfides.

Hördt, Andreas, Bairlein, Katharina, Spagnoli, Giovanni, Jegen, Marion , Hannington, Mark D., Petersen, Sven and Laurila, Tea E. (2016) Induced polarization of seafloor massive sulfides. [Poster] In: 4. International Workshop on Induced Polarization (IP2016). , 06.-08.06.2016, Aarhus, Denmark .

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Abstract

Sefloor massive sulfides (SMS) are believed to constitute an important future mineral resource. Nevertheless, little is known about the electrical properties of SMS, in particular under in-situ conditions. We measured electrical impedance spectra of 40 samples, 30 of which are sulfidebearing, and 10 are unmineralized host-rock. The samples were saturated with sodium chloride solution with 5 S/m conductivity.
The resistivity magnitude shows a clear difference between mineralized and unmineralized samples, and also
a weak grouping between the different types of mineralization. The imaginary conductivity at 1 Hz indicates a more pronounced discrimination between mineralized and unmineralized samples, suggesting that complex measurements might be useful for exploration purposes. We also measured spectra under dry conditions.
Surprisingly, the sulfide-bearing samples exhibit significant phase shifts even for dry samples, indicating that the conducting minerals themselves cause a phase shift, and an interaction with an electrolyte might not be necessary.

Document Type: Conference or Workshop Item (Poster)
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems > Marine Mineralische Rohstoffe
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Date Deposited: 14 Jun 2016 08:37
Last Modified: 01 Dec 2016 14:00
URI: http://oceanrep.geomar.de/id/eprint/33065

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