Estimation of Electrical Spectra of Irregular Embedded Samples
In order to interpret spectral induced polarization (SIP) data measured in the field for the purpose of mineral exploration, laboratory investigations are necessary that establish relationships between electrical parameters and mineral properties. For massive ores, and in particular for seafloor mas...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-03-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/13/3/412 |
| _version_ | 1797609986129395712 |
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| author | Malte Wichmann Andreas Hördt |
| author_facet | Malte Wichmann Andreas Hördt |
| author_sort | Malte Wichmann |
| collection | DOAJ |
| description | In order to interpret spectral induced polarization (SIP) data measured in the field for the purpose of mineral exploration, laboratory investigations are necessary that establish relationships between electrical parameters and mineral properties. For massive ores, and in particular for seafloor massive sulfides (SMSs), samples may be difficult to obtain, and it is often not desired to cut cylindrical plugs out of the available hand pieces. We suggest a method to obtain the electrical spectra of hand pieces from measurements on the samples embedded in a non-polarizing medium, in our case quartz sand. As such, destroying potentially precious samples is not necessary. The frequency-dependent phase spectrum of the sample is calculated by dividing the bulk spectrum with a so-called dilution factor, which is obtained from numerical simulation and has a real and constant value. We evaluate the method with a set of SMS samples where conventional cylindrical plugs are available. We can estimate the phase shift maximum of 73% of the samples with a deviation less than 50% from the reference. The estimation quality slightly decreases if the dilution factor is approximated by the volumetric share of the sample. We consider the performance acceptable if the general difficulty to obtain reproducible and representative laboratory measurements for massive sulfides is taken into account. |
| first_indexed | 2024-03-11T06:08:07Z |
| format | Article |
| id | doaj.art-37dd048081bf4d42bf8d32fee48fb7d1 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-11T06:08:07Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-37dd048081bf4d42bf8d32fee48fb7d12023-11-17T12:48:14ZengMDPI AGMinerals2075-163X2023-03-0113341210.3390/min13030412Estimation of Electrical Spectra of Irregular Embedded SamplesMalte Wichmann0Andreas Hördt1Institute for Geophysics and Extraterrestrial Physics, Technische Universität Braunschweig, 38106 Braunschweig, GermanyInstitute for Geophysics and Extraterrestrial Physics, Technische Universität Braunschweig, 38106 Braunschweig, GermanyIn order to interpret spectral induced polarization (SIP) data measured in the field for the purpose of mineral exploration, laboratory investigations are necessary that establish relationships between electrical parameters and mineral properties. For massive ores, and in particular for seafloor massive sulfides (SMSs), samples may be difficult to obtain, and it is often not desired to cut cylindrical plugs out of the available hand pieces. We suggest a method to obtain the electrical spectra of hand pieces from measurements on the samples embedded in a non-polarizing medium, in our case quartz sand. As such, destroying potentially precious samples is not necessary. The frequency-dependent phase spectrum of the sample is calculated by dividing the bulk spectrum with a so-called dilution factor, which is obtained from numerical simulation and has a real and constant value. We evaluate the method with a set of SMS samples where conventional cylindrical plugs are available. We can estimate the phase shift maximum of 73% of the samples with a deviation less than 50% from the reference. The estimation quality slightly decreases if the dilution factor is approximated by the volumetric share of the sample. We consider the performance acceptable if the general difficulty to obtain reproducible and representative laboratory measurements for massive sulfides is taken into account.https://www.mdpi.com/2075-163X/13/3/412spectral induced polarizationseafloor massive sulfideshand piecegeoelectricsresistivitylaboratory |
| spellingShingle | Malte Wichmann Andreas Hördt Estimation of Electrical Spectra of Irregular Embedded Samples Minerals spectral induced polarization seafloor massive sulfides hand piece geoelectrics resistivity laboratory |
| title | Estimation of Electrical Spectra of Irregular Embedded Samples |
| title_full | Estimation of Electrical Spectra of Irregular Embedded Samples |
| title_fullStr | Estimation of Electrical Spectra of Irregular Embedded Samples |
| title_full_unstemmed | Estimation of Electrical Spectra of Irregular Embedded Samples |
| title_short | Estimation of Electrical Spectra of Irregular Embedded Samples |
| title_sort | estimation of electrical spectra of irregular embedded samples |
| topic | spectral induced polarization seafloor massive sulfides hand piece geoelectrics resistivity laboratory |
| url | https://www.mdpi.com/2075-163X/13/3/412 |
| work_keys_str_mv | AT maltewichmann estimationofelectricalspectraofirregularembeddedsamples AT andreashordt estimationofelectricalspectraofirregularembeddedsamples |