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On palaeomagnetic dating of fluvial deposits in the section of Neporotove gravel quarry on the Middle Dniester

dc.contributor.authorBondar, Kseniia
dc.contributor.authorRidush, Bogdan
dc.contributor.authorBaryshnikova, Mariia
dc.contributor.authorPopiuk, Yana
dc.date.accessioned2021-09-26T08:49:22Z
dc.date.available2021-09-26T08:49:22Z
dc.date.issued2019
dc.identifier.citationBondar, K., Ridush, B., Baryshnikova, M., Popiuk, Y. (2019). On palaeomagnetic dating of fluvial deposits in the section of Neporotove gravel quarry on the Middle Dniester. Journal of Geology, Geography and Geoecology, 28(2), 241–249. doi: 10.15421/111925uk_UA
dc.identifier.issn2617-2909
dc.identifier.urihttps://archer.chnu.edu.ua/xmlui/handle/123456789/861
dc.description.abstractThe paper presents the results of palaeomagnetic studies of Quaternary non-cemented deposits from the section of Neporotove on the VIIIth terrace of the Dniester River valley with an abnormal thickness (more than 20 m) of the channel alluvium near the village of Neporotove, located on the right bank of the Dniester River. Alluvial facies of river terraces’ deposits are valuable palaeogeographic archives but not quite complete. They are affected by denudation and often do not contain fossils. The possible way for their dating is provided by a palaeomagnetic method performed on suitable for sampling underlying and overlying beds. The alluvial sequence consists of four units. Unit I is composed of inclined gravel-pebble layers with the sand filler with a visible thickness of about 8 m. Unit II has bedded over the denudated surface of Unit I; it consists of light-yellow laminated aleurit loam, 5-30 cm thick underlaid by 0.5-1.5 bed of fine sand. We consider Unit II to be lacustrine deposits accumulated in quiet water. Unit III is represented with inclined or sub-horizontally layered gravel-pebble-boulder deposits with up to 10 m of visible thickness. It includes boulders and blocks of sedimentary rocks up to 1.0 in diameter, considered as drop-stones. In the roof of the gravel-pebble Unit III, there is the white carbonate layer, probably, the illuvial horizon of the palaeosol (mr1), which transited up into the brownish-red horizon A (Unit IV). Unit IV – dark-red sandy-gravel horizon, pedosediment, probably partly the reworked material washed into ice wages in the roof of Unit III. As a result of alternating field stepwise demagnetisation of natural remanence of sediments, we determined that loamy Unit II, which separates members of gravel stratum, and sandy Unit IV, which overlays packs of gravel alluvium, bear characteristic remanent magnetisation (RM) with normal geomagnetic polarity. Taking into consideration lithology and the two-fold structure of terrace gravel alluvium as well as palaeomagnetic results, we assume the lacustrine deposits of Unit II were formed during Jaramillo palaeomagnetic subchron corresponding to the end of Shyrokyne Stage, and a pedosediment of Unit IV was formed during Martonosha Stage. The upper alluvial suite of a terrace (Unit III) was generally deposited during a cold stage, directly prior to the onset of lacustrine loam sedimentation, while the lower alluvial member (Unit I) dates from the preceding warm stage. Thus, we defined the geological age of the whole channel alluvium strata of the VIIIth Dniester terrace as Shyrokyne-Pryazovya Stage.uk_UA
dc.language.isoen_USuk_UA
dc.publisherOles Gonchar Dnipro National Universityuk_UA
dc.subjectDniester Riveruk_UA
dc.subjectNeporotove gravel quarryuk_UA
dc.subjectriver terraceuk_UA
dc.subjectpalaeomagnetic datinguk_UA
dc.subjectchannel alluviumuk_UA
dc.subjectremanent magnetisationuk_UA
dc.titleOn palaeomagnetic dating of fluvial deposits in the section of Neporotove gravel quarry on the Middle Dniesteruk_UA
dc.typeArticleuk_UA


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