Magnetic modelling of strongly magnetized bodies

Koppelt, Uwe; Abrahamsen, Niels; Voss, Olfert

doi:10.1016/s0079-1946(98)00134-7

Cited by 3 publications

(4 citation statements)

References 12 publications

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“…effective way of finding the exact location, the areal extent and even the number of the remaining slag pits (e.g. Smekalova, et al, 1993a, 1993b, 1996Abrahamsen et al, 1997, 1998bKoppelt et al, 1998).…”

Section: Magnetic Surveying and Location Of Slagmentioning

confidence: 99%

“…To determine more exactly the position, the depth, the magnetic moment and the magnetized direction of a slag pit, the magnetic anomaly may be inverted (Jacobsen and Abrahamsen, 1997; Koppelt et al, 1998Koppelt et al, , 1999, comparing by iteration the anomaly calculated from a simple dipole (equivalent to a magnetic sphere) with the actually observed magnetic anomalies from the field surveying. The inversion is objective and the convergence is quite fast, a very good fit being obtained within only a few steps in the iteration ).…”

Section: Magnetic Modelling By Inversionmentioning

confidence: 99%

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Archaeomagnetic investigations of Iron Age slags in Denmark

Abrahamsen

Jacobsen

Koppelt

et al. 2002

Archaeological Prospection

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In Denmark iron production, by means of reducing bog-iron ore with charcoal, was carried out at least between the second and seventh century AD. Since the 1960s magnetic mapping of iron slag remains have been used extensively at several sites in the southwestern part of Jutland in Denmark (e.g. at Drengsted, Snorup, Krarup and Yderik). A description of some of the magnetic surveying results, ideas of magnetic modelling, and magnetic and chemical analysis of slag from some of these areas are given. The Danish Iron Age slag pits are strongly magnetic, and consequently they are quite easy to locate magnetically. The slag, however, is often magnetically non-homogeneous, and accordingly the remanent magnetic direction of the original magnetization is not uniform. Hence individual slag pits are not good recorders of the direction of Earth's magnetic field. Therefore dating of individual slag pits by means of a magnetic mastercurve, using either inversion and modelling of the magnetic field anomaly from the slag, or by using conventional palaeomagnetic techniques by orientated cores, are still difficult to make with sufficient resolution.

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Section: Magnetic Surveying and Location Of Slagmentioning

confidence: 99%

Section: Magnetic Modelling By Inversionmentioning

confidence: 99%

Archaeomagnetic investigations of Iron Age slags in Denmark

Abrahamsen

Jacobsen

Koppelt

et al. 2002

Archaeological Prospection

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“…The inverse modelling algorithm was applied to determine the direction of total magnetization. Since there was evidence of shape anisotropy from palaeomagnetic and petromagnetic investigation resuits, an algorithrn correcting for magnetic refraction effects was developed (Koppelt et aL, 1997). Corrected inversion resuits are given in fig.…”

Section: Magnetic Investigations In Sw Jutlandmentioning

confidence: 99%

“…Based on empirical relations between total field anomalies and weight of slag bodies (Smekalova et al, 1993), the total slag mass was estimated. Since 1995 the focus changed towards studies concerning measurement configurations and resolution (Koppelt et al, 1996), and age deterinination by palaeomagnetic investigations and inverse modelling of total field data (Abrahamsen et al, Koppelt et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Comparing techniques applied in magnetic investigations of iron production sites in SW Jutland (Denmark) and the Lausitz region (Germany)

Koppelt¹,

Abrahamsen²,

Dittrich³

et al. 1997

3rd EEGS Meeting

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Preliminary Magnetic Susceptibility Characteristics of the Bharati Promontory (Grovness Peninsula), Larsemann Hills, Prydz Bay Region, East Antarctica

Pandit

Wall

2014

Journal of the Geological Society of India

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The coastal tract of the Prydz Bay region in the East Antarctica exposes Archean to Late Proterozoic magmatic and medium- to high grade (amphibolite – granulite facies) metamorphic rocks. The para- and ortho gneisses from the Bharati promontory (Grovness Peninsula) forming a part of the Larsemann Hills in the southern segment of Prydz Bay were investigated for magnetic characterization. In this small peninsula the upper amphibolite facies gneisses occur as NE-trending bands. The para-gneisses show a range of mineral assemblages (± cordierite ± sillimanite ±garnet) while ortho-gneiss mineralogy includes quartz, feldspar, biotite, garnet. All the lithological units in Bharati promontory contain ubiquitous magnetite, however, with wide variation in the volume proportions. This has resulted in a wide range in magnetic susceptibility (10−4 to 10−2 SI). Magnetic foliations show a correspondence with the general trend of lithounits (050° NE) and define a resulting geometry of mainly D1 and D2 foliations. The magnetic lineations show a preferred orientation with moderate easterly plunge (mean vector 093/36). The findings have implications for the magnetic field survey because such fabrics would impart a strong horizontal component of induced magnetization.

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Magnetic modelling of strongly magnetized bodies

Cited by 3 publications

References 12 publications

Archaeomagnetic investigations of Iron Age slags in Denmark

Archaeomagnetic investigations of Iron Age slags in Denmark

Comparing techniques applied in magnetic investigations of iron production sites in SW Jutland (Denmark) and the Lausitz region (Germany)

Preliminary Magnetic Susceptibility Characteristics of the Bharati Promontory (Grovness Peninsula), Larsemann Hills, Prydz Bay Region, East Antarctica

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