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Abstract

Summary

A palaeomagnetic study of the basic rock of the Volodarsk-Volynskyi masiff of the Korosten pluton was performed. Based on the results of temperature demagnetization of studied rocks, the viscous low-temperature and high-temperature characteristic component of magnetisation were identified. The characteristic bipolar component was isolated for rocks of 10 sampling sites (anorthosite and gabbro) with geochronological age ca. 1.76 Ga, its mean direction D = 213.5°, I = 10.8°, k = 60.2, α95 = 6.3°. Rock magnetic and microscopy data indicate the primary nature of this component, the carrier of which is thin isolated needle-like and lamellar exsolution of ferromagnetics with Curie temperature ca. 580 °C in plagioclases and pyroxenes. The new palaeomagnetic pole for studied rocks of age about 1.76 Ga, calculated based on characteristic component of magnetisation, has parameters P = 26.9, P = 170.7, A = 4.5. The new results are in good agreement with the data previously obtained for other rocks of similar age within the Volyn and Ingul domains of the Ukrainian Shield, which may indicate the development of these domains within Ukrainian Shield as a single tectonic unit starting at least from 1.76 Ga. According to the new data, about 1.76 Ga the Ukrainian shield was located slightly south of the equator.

EAGE Publications BV © 2021 The Authors © European Association of Geoscientists and Engineers
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/content/papers/10.3997/2214-4609.2023510008
2023-10-02
2025-04-29

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References

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/content/papers/10.3997/2214-4609.2023510008
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Palaeomagnetism of the Palaeoproterozoic Basic Rocks of the Volodarsk-Volynskyi Massif, Korosten Plutonic Complex
Conference Proceedings 2023, 1 (2023); https://doi.org/10.3997/2214-4609.2023510008
/content/papers/10.3997/2214-4609.2023510008
/content/papers/10.3997/2214-4609.2023510008
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