Monte Carlo modelling of TRM and CRM acquisition and comparison of their properties in an ensemble of interacting SD grains

Щербаков, В. П.; Sycheva, N. K.; Lamash, B. E.

doi:10.1029/96gl01999

Cited by 14 publications

(27 citation statements)

References 8 publications

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“…Thus, the CRM/TRM relation is a function of T b and T CRM , which means that their blocking temperature spectra are not identical. This conclusion was confirmed later by numerical Monte-Carlo modeling of TRM and CRM acquisition carried out by Shcherbakov et al (1996) who showed, in particular, that for strong magnetostatic interaction-i.e., in the case of a high volume concentration of SD grains-the relation CRM/TRM < 1, valid for non-interacting SD grains, reverses to CRM/TRM > 1. Still, the thermal stability of TCRM and TRM can be compared for a narrow temperature range, so one must be cautious interpreting results obtained on samples having a narrow T b spectrum.…”

Section: Kafan Sectionsupporting

confidence: 58%

Rock magnetic and paleointensity results from Mesozoic baked contacts of Armenia

et al. 2009

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Samples were obtained from three baked contacts and one lava flow along the upper Turonian-lower Coniacian Tovuz section, two baked contacts along the upper Coniacian-lower Santonian Paravakar section in the northern part of Armenia, and three baked contacts along the Titonian-Valanginian Kafan section in southern Armenia. A total of 130 samples were studied. Updated mean paleomagnetic poles were calculated for the Upper Cretaceous Tovuz-Paravakar sections (65.6• N, 162.2 • E, A 95 = 4.3, paleolatitude = 27.0 ± 3.4• ) and the Upper JurassicLower Cretaceous Kafan section (61.7• N, 158.9• E, A 95 = 4.8• , paleolatitude = 24.7 ± 3.8 • ). Paleointensity determinations could be estimated from two of the upper Cretaceous and three of the Upper Jurassic-Lower Cretaceous baked contacts, corresponding to a 30% success rate. The mean virtual dipole moments obtained were low (1.7-5.5 × 10 22 A m 2 ), which is in agreement with data published by Solodovnikov (1981a, 1983) for the same sections (3.0-4.4 × 10 22 A m 2 ). Our results support the hypothesis of the Mesozoic Dipole Low, even though the overall data are widely dispersed.

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Section: Kafan Sectionsupporting

confidence: 58%

Rock magnetic and paleointensity results from Mesozoic baked contacts of Armenia

et al. 2009

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“…The thermodynamic equilibrium at a given temperature is frozen in by increasing the energy barrier between two competing magnetization states. Current theories of chemical remanent magnetization (CRM) acquisition by grain growth follow this concept [ Kobayashi , 1962; Stacey and Banerjee , 1974; Stokking and Tauxe , 1990; McClelland , 1996; Shcherbakov and Sycheva , 1996], where the blocking condition depends on the isothermal change of the energy barrier with increasing volume.…”

Section: Introductionmentioning

confidence: 99%

Thermochemical remanence acquisition in single‐domain particle ensembles: A case for possible overestimation of the geomagnetic paleointensity

Fabian

2009

Geochem Geophys Geosyst

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[1] Single-domain (SD) particle ensembles are the best studied systems in rock magnetism. Yet even for this simple system, a complete theoretical treatment of the acquisition of thermochemical remanent magnetization (TCRM) is missing. On the basis of the SD theory of chemical remanent magnetization, it is generally taken for granted that TCRM acquisition must be less efficient than acquisition of a thermoremanent magnetization (TRM) and that consequently, the paleofield intensity is inevitably underestimated when a TCRM is interpreted as a TRM. Here it is shown that this conclusion holds only when a continuous chemical change (e.g., grain growth) takes place during remanence blocking. In cases where an initial TRM, at a later time and at lower temperature, is modified by chemical processes, the final TCRM can result in considerable paleofield overestimation when interpreted as a TRM. This is demonstrated for two different scenarios. First, partial grain dissolution after TRM acquisition and second, low-temperature oxidation. These mechanisms are not unlikely to occur in nature, and numerical experiments indicate that both would lead to perfectly straight Arai plots, which makes such SD TCRMs indistinguishable from true TRMs in the Thellier experiment.Components: 5025 words, 4 figures.

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“…[3] The ARM is a complicated magnetic acquisition process that is extremely sensitive to the size of the magnetic particles, and to magnetostatic interactions [Egli and Lowrie, 2002;Sugiura, 1979]. These properties are shared with other weak-field magnetizations, such as the thermoremanent and the chemical remanent magnetization [Néel, 1949[Néel, , 1955Shcherbakov et al, 1996]. It is not surprising that modeling of weak-field magnetizations is an extremely difficult task, especially if magnetostatic interactions are included.…”

Section: Introductionmentioning

confidence: 99%

“…These properties are shared with other weak-field magnetizations, such as the thermoremanent and the chemical remanent magnetization [Néel, 1949[Néel, , 1955Shcherbakov et al, 1996]. It is not surprising that modeling of weak-field magnetizations is an extremely difficult task, especially if magnetostatic interactions are included.…”

Section: Introductionmentioning

confidence: 99%

Theoretical considerations on the anhysteretic remanent magnetization of interacting particles with uniaxial anisotropy

Egli

2006

J. Geophys. Res.

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[1] The anhysteretic remanent magnetization (ARM) is widely used in rock magnetism and paleomagnetism because of its sensitivity to the domain state of magnetic particles and the close analogy to natural remanent magnetizations. On the other hand, the ARM shares with other weak-field magnetizations the property of being extremely sensitive to magnetostatic interactions. Therefore it is desirable to model the effects of interactions on natural assemblages of magnetic particles. Direct micromagnetic calculations of the ARM acquisition process are not practicable; therefore an analytical approach is used calculate the ARM susceptibility of a system of interacting single-domain (SD) particles. The model is based on a statistical description of the interaction field. The equations obtained have been used to evaluate the dependence of the ARM on the packing fraction of the magnetic particles. The effect of interactions on the anisotropy of ARM (AARM) was evaluated as well. The AARM of densely packed particles is complex and depends critically on the microcoercivity. A physical interpretation of the AARM of highly interacting particles is therefore difficult.

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Monte Carlo modelling of TRM and CRM acquisition and comparison of their properties in an ensemble of interacting SD grains

Cited by 14 publications

References 8 publications

Rock magnetic and paleointensity results from Mesozoic baked contacts of Armenia

Rock magnetic and paleointensity results from Mesozoic baked contacts of Armenia

Thermochemical remanence acquisition in single‐domain particle ensembles: A case for possible overestimation of the geomagnetic paleointensity

Theoretical considerations on the anhysteretic remanent magnetization of interacting particles with uniaxial anisotropy

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