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Abstract

Summary

Recent researches have been shown that sources of longwavelength geomagnetic anomalies are located at upper mantle depths to which earthquake sources may be associated. Therefore, there is a requirement of magnetomineralogical and physical justification for the possibility of the existence of magnetized rocks at these depths. The main minerals retaining magnetic properties in the lower crust and upper mantle are magnetite, haematite, native α -Fe iron and its alloys. The emergence and transformation of iron minerals and reducing of α -Fe can occur due to the reactions of reducing fluids with different iron compounds and rocks in particular at junction zones of lithospheric plates of different types, rifts, plumes, tectonic-thermal activation, etc. The mantle xenoliths are the main sources of information of mantle magnetization and characterized by pure magnetite inclusions in olivine and pyroxenes. Magnetite is formed due to serpentinization processes in the mantle peridotites. Iron oxides and native iron are potential sources of magnetic anomalies in the mantle. Studies have shown that haematite remains magnetic at depths of transition zone in the mantle in cold or very cold subduction geotherms. α -Fe can be found in the lower crust and upper mantle due to the low oxygen fugacity and the reducing nature of the geochemical environment.

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/content/papers/10.3997/2214-4609.201903209
2019-11-12
2024-04-23

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MAGNETOMINERALOGICAL SUBSTANTIATION OF MAGNETIZATION OF THE ROCKS OF THE LOWER CRUST AND UPPER MANTLE
Conference Proceedings 2019, 1 (2019); https://doi.org/10.3997/2214-4609.201903209
/content/papers/10.3997/2214-4609.201903209
/content/papers/10.3997/2214-4609.201903209
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