Demagnetization studies in the North Singhbhum Mobile Belt, Eastern India: new palaeomagnetic poles, tectonics, and GRM

Chatterjee, Saurodeep; Mondal, Supriya; Basavaiah, N.; Gain, Debesh; Das, Sankar

doi:10.1007/s12517-022-10808-w

Arab J Geosci

2022

DOI: 10.1007/s12517-022-10808-w

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Demagnetization studies in the North Singhbhum Mobile Belt, Eastern India: new palaeomagnetic poles, tectonics, and GRM

Saurodeep Chatterjee

Supriya Mondal

N. Basavaiah

et al.

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2024

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Rock magnetic properties vis-à-vis thermal gradient in basaltic flows, Rajmahal traps, India

Chatterjee,

Arif,

Singh

2024

Preprint

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The present study aims to determine the relationship between thermal gradient and rock magnetic parameters in the Rajmahal trap basalts of eastern India. Rock magnetic analyses are carried out which include magnetic susceptibility (χ) and its temperature (T) dependence (χ-T plots), Isothermal Remanent Magnetization (IRM) acquisition and backfield remanence coercivity of the IRM and Saturation IRM (SIRM). Also, some inter-parametric ratios like SIRM/χ and S-ratio are calculated. A thermo-magnetic deviation parameter (defined as the numerical difference between the Curie temperatures determined from the heating and cooling curves) is determined from the χ-T plots. Thermo-magnetic deviation varies with the distance from the eruptive centres, specifically, it decreases with increasing distance and cooling rate and is thus, considered a useful proxy for the cooling rate of lavas. It is shown that the composition-dependent parameters (χ and SIRM) and grain-size related parameters (SIRM/χ) have direct or indirect proportionality with the cooling rates. SIRM and χ decrease with increasing cooling rate and mark a decrease in ferrimagnetism from the eruptive centre towards the periphery in the igneous province. The SIRM/χ either decreases or shows an even pattern with increasing cooling rate, suggesting an abundance of Pseudo-Single-Domain (PSD)-sized magnetic grains. Despite this, the composition of the magnetic minerals (depicted by the S-ratio) is independent of the thermo-magnetic deviation and the cooling rate in the igneous province.

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Rock magnetic properties vis-à-vis thermal gradient in basaltic flows, Rajmahal traps, India

Chatterjee,

Arif,

Singh

2024

Preprint

View full text Add to dashboard Cite

show abstract

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Demagnetization studies in the North Singhbhum Mobile Belt, Eastern India: new palaeomagnetic poles, tectonics, and GRM

Cited by 1 publication

References 44 publications

Rock magnetic properties vis-à-vis thermal gradient in basaltic flows, Rajmahal traps, India

Rock magnetic properties vis-à-vis thermal gradient in basaltic flows, Rajmahal traps, India

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