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  4. New results of palaeomagnetic and rock magnetic studies of gabbroids of the Korosten pluton of the Ukrainian Shield

New results of palaeomagnetic and rock magnetic studies of gabbroids of the Korosten pluton of the Ukrainian Shield

JGD.
2025;
Volume 2(39)2025, Number 2(39)
: 129-144
Received: September 29, 2025
Authors:
  1. Semyon Cherkes
1
Institute of Geophysics, National Academy of Sciences of Ukraine,

Palaeomagnetic and rock magnetic studies were conducted on anorthosites and gabbros from the Volodarsk-Volynskyi massif of the Korosten pluton to obtain new palaeomagnetic determinations that meet modern reliability criteria. The results confirm that the main magnetic carriers in these rocks are magnetite and titanomagnetite, which contain a small amount of Ti. A bipolar characteristic component of magnetisation, isolated in the temperature range of 500–580 °C, demonstrates a primary origin and thermoremanent nature. The new 1.76 Ga palaeomagnetic pole (Φ = 29.3°, Λ = 168.2°, A95 = 3.3°, N = 6) is in good agreement with palaeomagnetic determinations of similar age for the Inhul and Volyn domains of the Ukrainian Shield. This suggests that the evolution of these domains within the unified structure of the Ukrainian Shield began at least 1.76 Ga. To clarify the timing of the amalgamation of the East European Platform, and to calculate its palaeolatitudinal position and kinematic parameters (latitudinal drift and angular rotation velocity) of its segments, a selection of the most reliable Palaeoproterozoic palaeomagnetic determinations for Fennoscandia and Sarmatia was compiled. Palaeogeographic reconstructions of these segments were performed for specific time intervals. According to the palaeomagnetic data, their final amalgamation occurred no earlier than 1.76 Ga. At that time, these segments were located in the equatorial zone, and the Ukrainian Shield (as part of Sarmatia) was rotated ~40° counterclockwise relative to Fennoscandia.

Korosten pluton; Ukrainian Shield; gabbroids; palaeomagnetism; rock magnetism; palaeomagnetic pole; palaeogeographic reconstructions
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