Paleosecular Variations of the Geomagnetic Field Isolated in Pliocene–Quaternary Sediments of Western Turkmenistan

Abstract: Akchagyl deposits of Western Turkmenistan were studied in order to identify the spectrum of paleosecular variations in the geomagnetic field in Pliocene–Quaternary sediments. The detrital nature of remanent magnetization is established. The spectra of geomagnetic field variations in the Gauss direct polarity intervals (Zau section) and Matuyam reverse polarity intervals (Issu section) in Western Turkmenistan were studied. The spectrum of secular variations in the geomagnetic field is distinguished, in particular, by periods of 8–10, 25–30, and 45–50 ka. The selected periods are stable throughout the Pleistocene and agree well with the results obtained from corresponding deposits in Armenia and Azerbaijan. It should be noted that the revealed discrete series often differ for different elements of the field and different time intervals. © 2020, Pleiades Publishing, Ltd.