Szczegóły obiektu: Miocene quartz sands redeposited on subaqueous and alluvial fans during the Saalian: Interpretation of the depositional scenario at Ujście, western Poland

Instytucja dostarczająca:Platforma Otwartych Czasopism Naukowych UAM

Opis

Title:
Miocene quartz sands redeposited on subaqueous and alluvial fans during the Saalian: Interpretation of the depositional scenario at Ujście, western Poland
Creator:
Mleczak, Mateusz;
Pisarska-Jamroży, Małgorzata
Description:
The 14-m-thick sandy succession at Ujście in western Poland formed during the Odranian stadial of the Saalian glaciation, is exceptional in being very well sorted, almost mono-fractional (fine-grained sands) and mono-mineral (mainly quartz grains) and in lacking Scandinavian erratics. The lower sequence (5 metres in thickness) consists of three stacked packages of clinoforms (inclined cross-stratified sands) and is interpreted as having been deposited on a subaqueous fan in a shallow lake during two phases of rising water levels. The upper sand (9 metres in thickness) with (sub) horizontal stratification was redeposited on a subaerial alluvial fan. Distinctive distributary channels that occur in the uppermost part of the subaqueous fan and in the lowermost portion of the alluvial fan may indicate a change in sedimentation style from subaqueous to subaerial. Moreover, the subaerial position of the fan supports the presence of ice-wedge casts that developed under periglacial conditions in the upper part of alluvial fan. The results of granulo-metric analysis, rounding and frosting of grains and mineral analysis indicate that the sands are derived from Gorzów Formation of Early Miocene age. The only feasible explanation is that the 14-m-thick unit must have been redeposited during the Saalian glaciation.
Object availability:
Dostęp otwarty
Rights: https://creativecommons.org/licenses/by-nc-nd/3.0/ ;
Prawa autorskie (c) 2019 Mateusz Mleczak, Małgorzata Pisarska-Jamroży
Date:
2019.08.01
Type:
info:eu-repo/semantics/article;
info:eu-repo/semantics/publishedVersion;
Research papers
Language:
angielski
Source:
Geologos; Vol. 25 No. 2 (2019); 125-137;
Geologos; Tom 25 Nr 2 (2019); 125-137;
2080-6574;
1426-8981
Format:
application/pdf
Publisher:
Adam Mickiewicz University Poznan
Relation: http://pressto.amu.edu.pl/index.php/logos/article/view/logos-2019-0012/30558
Subject:
proglacial lake;
distributary channels;
sandy clinothems;
Odranian stadial
Identifier: http://pressto.amu.edu.pl/index.php/logos/article/view/logos-2019-0012
Data provider:
Platforma Otwartych Czasopism Naukowych UAM

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Szczegóły obiektu: Miocene quartz sands redeposited on subaqueous and alluvial fans during the Saalian: Interpretation of the depositional scenario at Ujście, western Poland

Opis

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