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Magnetic Anisotropy vs. Shape Preferred Orientation in Quartzites with Negative Susceptibility — Implications for Analysing Strain Intensity Variations

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Journal of the Geological Society of India

Abstract

Through this study the robustness of using anisotropy of magnetic susceptibility (AMS) data is tested as a gauge of intensity of shape preferred orientation (SPO) in pure quartzites that have a low mean magnetic susceptibility (Km). AMS of eight quartzite samples from the Rengali province (eastern India) is measured, and the degree of magnetic anisotropy Pj, which is a measure of the intensity of magnetic fabric is calculated. Quartz grain size, shape as well as orientation data are obtained based on SEM-EBSD analysis of each sample. Using these microstructural data, intensity of SPO of quartz grains in each sample is quantified by measuring (i) the concentration parameter (κq) and (ii) the azimuthal anisotropy of fractal dimension (AAD). Magnitude of 2D strain (E) is also estimated for each sample. Based on these data the statistical relationship between the various parameters is evaluated viz. Pj vs. κq, Pj vs. AAD, Pj vs. E, κq vs. AAD, κq vs. E, AAD vs. E. A strong linear relationship is established in each case. It is argued that quartz aspect ratio, dominant slip systems/recrystallization mechanisms cannot explain the strong linear correlations between magnetic anisotropy, SPO and strain. To further support findings of the above determined relationships, positive Km quartzites were also investigated. It is found that the latter do not show a strong relationship between the intensity of AMS, SPO and strain. It is therefore, established that whilst the variation in intensity of magnetic fabric can be used to gauge variation in intensities of strain as well as SPO in the investigated negative Km quartzites, the same is not true for positive Km quartzites, where the AMS is controlled the para/ferromagnetic phases present in the rock.

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Acknowledgements

This paper is a part of ARR’s doctoral research carried out at the Indian Institute of Technology (IIT) Kharagpur, India. The authors thank Biswajit Mishra, Manoj Kumar Ozha and B. Govindarao for SEM-EDS analysis in Department of Geology & Geophysics (IIT Kharagpur). Niloy Bhowmik is thanked for technical support in carrying out SEM-EBSD analysis at the Central Research Facility (CRF, IIT Kharagpur). Temperature variation of magnetic susceptibility measurements were made at the Karlsruhe Institute of Technology (Karlsruhe, Germany) by MAM during a research visit that was funded by the Alexander von Humboldt Foundation (Germany). Discussions with Agnes Kontny are gratefully acknowledged. Thanks are due to Koushik Sen for a thoughtful review.

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  1. Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, 721 302, India

    A. R. Renjith, Manish A. Mamtani, V. Abhijith & Virendra Rana

  2. Oxford Instruments India Pvt. Ltd., Mumbai, 400 072, India

    A. R. Renjith

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Renjith, A.R., Mamtani, M.A., Abhijith, V. et al. Magnetic Anisotropy vs. Shape Preferred Orientation in Quartzites with Negative Susceptibility — Implications for Analysing Strain Intensity Variations. J Geol Soc India 94, 23–34 (2019). https://doi.org/10.1007/s12594-019-1262-1

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