Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8868283 | Palaeogeography, Palaeoclimatology, Palaeoecology | 2018 | 43 Pages |
Abstract
Measurements of the anisotropy of whole-rock magnetic susceptibility (AMS) and U-Pb ages of detrital zircons have been combined to define the palaeowind directions and sources of wind-blown dust in the loess-palaeosol key section at Roxolany (southern Ukraine). Zircon dating has also been used to determine the age and provenance of the interbedded Roxolany tephra. The distribution of AMS axes in the loess indicates that the prevailing wind during its accumulation blew from the north-west, the same as the mean present-day summer wind direction measured in the nerby city of Odessa. The U-Pb isotopic ages of the detrital zircons mostly range between 0.25 and 2â¯Ga, with clusters at 0.28, 0.32, 0.45, 0.58, 1.0 and 1.5â¯Ga. Single Neoarchean grains (ca. 2.7â¯Ga) were also found. These ages indicate that material from Carpathian and Podolian sources formed the Roxolany loess. This material initially was transported by the Dniester River, then was wind-blown form the Dniester liman and the lower Dniester valley, located NW of Roxolany. Most of the pyroclastic zircons from the Roxolany tephra gave ages of 470-840â¯ka, with a peak between 500 and 750â¯ka. This age range is consistent with their being derived from the Ciomadul volcano in Romania.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Earth-Surface Processes
Authors
Jerzy Nawrocki, Petro Gozhik, Maria Åanczont, Magdalena PaÅczyk, Maryna Komar, Andriy Bogucki, Ian S. Williams, Zbigniew Czupyt,