KVARTÉRNÍ SEDIMENTY NA SEVERNÍM PŘEDHRADÍ LOKALITY POHANSKO U BŘECLAVI

Q4 Earth and Planetary Sciences

Geological Research in Moravia and Silesia Pub Date : 2018-12-17 DOI:10.5817/GVMS2018-1-2-34

S. Nehyba, Marika Dvořáková, Nela Doláková, Petr Dresler

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引用次数: 3

Abstract

Sedimentological study on the Northern bailey of the fortified site Pohansko allows identification of 9th lithofacies and 2 facies associations. The lower facies association is interpreted as an infill of fluvial channels (mostly mid-channel dunes) with two cycles of filling. The fluvial channels were relatively shallow and broad (high width/depth channel ratio) and they point to braided fluvial style and channel migration. The upper fluvial association reflects significant change of the fluvial style. The sedimentary infill of the upper fluvial association is interpreted as deposits of levee and overbank deposits. Results of the OSL dating for the sample of lower facies association provide an age of 13.5 ky. Such age can be correlated with the Upper Pleistocene Allerød Interstadial (13.7‒12.9 ky BP), i.e. relatively warmer phase of the Weichselian late glacial. Data of OSL dating for two samples from the upper facies association were 11.8 ky and 10.3 ky BP. The upper age can be correlated with Younger Dryas (12.9‒11.7 ky BP) whereas the lower one to Preboreal. The deposition of the upper facies associations are therefore interpreted as Uppermost Pleistocene to Early Holocene in age.

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波甘斯克地区U BŘECLAVI北部准备区的四分之一沉积物

对强化场地Pohansko北部贝雷的沉积学研究可识别第9岩相和2个相组合。下部相组合被解释为河流河道（主要是河道中部沙丘）的填充，具有两个填充循环。河道相对较浅、较宽（宽深比高），表明河道为辫状河型，河道迁移。上游河流组合反映了河流样式的显著变化。上游河流组合的沉积填充物被解释为堤坝和河岸上沉积物的沉积物。较低相组合样品的OSL测年结果提供了13.5千年的年龄。该年龄可与上更新世Allerød星际（13.7-12.9千年BP）相关，即魏克塞利晚期冰川的相对温暖阶段。来自上部相组合的两个样品的OSL测年数据分别为11.8 ky和10.3 ky BP。年龄较高的可能与较年轻的Dryas（12.9-11.7ky BP）有关，而年龄较低的可能与Preboreal有关。因此，上部相组合的沉积在年龄上被解释为上更新世至全新世早期。

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来源期刊

Geological Research in Moravia and Silesia Earth and Planetary Sciences-Geology

CiteScore

0.40

自引率

0.00%

发文量

期刊介绍： The Geological research is peer-reviewed open access journal that publishes original research articles. The journal aims principally at quick publication of variety results from different fields of geological sciences and its applied sectors including interdisciplinary topics, laboratory experiments and modelling. Journal is focused on basic data and their simple and clear interpretation. Its aim is to facilitate the systematic development of the scientific body of knowledge in the field of geosciences with a span beyond the region of Central Europe. The form of articles/texts is as concise as possible. There is a section for publication of extended abstracts from conferences and meetings as well.