Examples of The Effect of Magnetic Soil Environments On Time Domain Electromagnetic Data

Walker, Sean E.; Pasion, Leonard R.; Billings, Stephen; Foley, J.E.; Li, Yaoguo; Oldenburg, Douglas W.

doi:10.3997/2214-4609-pdb.183.678-687

Cited by 12 publications

(4 citation statements)

References 2 publications

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“…3a). The region of large susceptibility corresponds to the area with a high TEM signal strength (Walker et al, 2005). The values are comparatively much higher than on Waimea and Waikoloa ( Fig.…”

Section: Magnetic Susceptibilitymentioning

confidence: 81%

“…1b). The locations were selected based on previously collected time-domain electromagnetic (TEM) data, TEM data collected in this fi eld campaign (Walker et al, 2005), and geomorphological characteristics of the terrain. Soil Pit KH-A was located in the area with the lowest magnetic background, just outside Grid 2E, while Soil Pits KH-B and KH-C were dug in areas with intermediate to high magnetic back- ground readings.…”

Section: Field Sampling and Measurementsmentioning

confidence: 99%

“…Soil Pit A (KH-A) is located in an area of low magnetic background (Walker et al, 2005) and magnetic susceptibility readings. The area has been signifi cantly eroded.…”

Section: Soil Descriptionsmentioning

confidence: 99%

“…Soil Pit B (KH-B), the only one located within Grid 2E, has the highest magnetic background readings of any site (Walker et al, 2005). In appearance, the soil is very similar to KH-C and KH-D, although the upper horizon appears more purple, perhaps indicating a higher hematite content.…”

Section: Soil Descriptionsmentioning

confidence: 99%

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Mineralogy and Magnetic Properties of Basaltic Substrate Soils: Kaho'olawe and Big Island, Hawaii

Dam

Harrison

Hirschfeld

et al. 2008

Soil Science Soc of Amer J

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Magnetic behavior of soils can seriously hamper the performance of geophysical sensors. Currently, we have little understanding of the types of minerals responsible for the magnetic behavior, as well as their distribution in space and evolution through time. This study investigated the magnetic characteristics and mineralogy of Fe‐rich soils developed on basaltic substrate in Hawaii. We measured the spatial distribution of magnetic susceptibility (χlf) and frequency dependence (χfd%) across three test areas in a well‐developed eroded soil on Kaho'olawe and in two young soils on the Big Island of Hawaii. X‐ray diffraction spectroscopy, x‐ray fluorescence spectroscopy (XRF), chemical dissolution, thermal analysis, and temperature‐dependent magnetic studies were used to characterize soil development and mineralogy for samples from soil pits on Kaho'olawe, surface samples from all three test areas, and unweathered basalt from the Big Island of Hawaii. The measurements show a general increase in magnetic properties with increasing soil development. The XRF Fe data ranged from 13% for fresh basalt and young soils on the Big Island to 58% for material from the B horizon of Kaho'olawe soils. Dithionite‐extractable and oxalate‐extractable Fe percentages increase with soil development and correlate with χlf and χfd%, respectively. Results from the temperature‐dependent susceptibility measurements show that the high soil magnetic properties observed in geophysical surveys in Kaho'olawe are entirely due to neoformed minerals. The results of our studies have implications for the existing soil survey of Kaho'olawe and help identify methods to characterize magnetic minerals in tropical soils.

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Section: Magnetic Susceptibilitymentioning

confidence: 81%

Section: Field Sampling and Measurementsmentioning

confidence: 99%

“…Soil Pit A (KH-A) is located in an area of low magnetic background (Walker et al, 2005) and magnetic susceptibility readings. The area has been signifi cantly eroded.…”

Section: Soil Descriptionsmentioning

confidence: 99%

Section: Soil Descriptionsmentioning

confidence: 99%

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