Coastal lowland and floodplain evolution along the lower reaches of the Supsa River (western Georgia)

Coastal lowland and floodplain evolution along the lower reaches of the Supsa River (western Georgia)

<p>In the southernmost part of the Colchian plain (Georgia), the Supsa and Rioni rivers represent important catchments for reconstructing Holocene landscape changes. Using granulometric methods, geochemical analyses and radiocarbon dating, we demonstrate that significant palaeoenvironmental ch...

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Main Authors: H. Laermanns, S. M. May, D. Kelterbaum, G. Kirkitadze, S. Opitz, L. Navrozashvili, M. Elashvili, H. Brückner
Format: Article
Language:deu
Published: Copernicus Publications 2019-07-01
Series:Eiszeitalter und Gegenwart
Online Access:https://www.eg-quaternary-sci-j.net/68/119/2019/egqsj-68-119-2019.pdf
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spelling doaj-7c0b35631138497c8c31f626c0bf573e2020-11-25T01:37:54ZdeuCopernicus PublicationsEiszeitalter und Gegenwart0424-71162199-90902019-07-016811913910.5194/egqsj-68-119-2019Coastal lowland and floodplain evolution along the lower reaches of the Supsa River (western Georgia)H. Laermanns0S. M. May1D. Kelterbaum2G. Kirkitadze3S. Opitz4L. Navrozashvili5M. Elashvili6H. Brückner7Institute of Geography, University of Cologne, Albertus-Magnus-Platz, 50923 Cologne, GermanyInstitute of Geography, University of Cologne, Albertus-Magnus-Platz, 50923 Cologne, GermanyInstitute of Geography, University of Cologne, Albertus-Magnus-Platz, 50923 Cologne, GermanyIlia State University, K. Cholokashvili Ave 3/5, Tbilisi 0162, GeorgiaInstitute of Geography, University of Cologne, Albertus-Magnus-Platz, 50923 Cologne, GermanyIlia State University, K. Cholokashvili Ave 3/5, Tbilisi 0162, GeorgiaIlia State University, K. Cholokashvili Ave 3/5, Tbilisi 0162, GeorgiaInstitute of Geography, University of Cologne, Albertus-Magnus-Platz, 50923 Cologne, Germany<p>In the southernmost part of the Colchian plain (Georgia), the Supsa and Rioni rivers represent important catchments for reconstructing Holocene landscape changes. Using granulometric methods, geochemical analyses and radiocarbon dating, we demonstrate that significant palaeoenvironmental changes have taken place in the surroundings of the Supsa fan since at least 4000 BCE. The initial foothill fan accumulation was prolonged by delta plain progradation. Due to continued fluvial sediment supply, mainly from the Rioni, the lagoon silted up and extended peat bogs formed east of the beach ridge complex. The Supsa fan first prograded northwards (since the third millennium BCE) and later shifted westwards, eventually following an avulsion of the Rioni. While Supsa deposits remain limited to the area of the fan and the modern estuary, the alluvial fines of the Rioni dominate the surrounding areas. The relative sea-level (RSL) index points of the region suggest a gradual RSL rise from <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M1" display="inline" overflow="scroll" dspmath="mathml"><mrow><mo>∼</mo><mo>-</mo><mn mathvariant="normal">9</mn></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="26pt" height="10pt" class="svg-formula" dspmath="mathimg" md5hash="9e7984693a9677c424a0f8a3cd0658c9"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="egqsj-68-119-2019-ie00001.svg" width="26pt" height="10pt" src="egqsj-68-119-2019-ie00001.png"/></svg:svg></span></span>&thinsp;<span class="inline-formula">m</span> between 4000 and 3500&thinsp;BCE to <span class="inline-formula">−3</span>/<span class="inline-formula">−2</span>&thinsp;<span class="inline-formula">m</span> below the modern sea level in the second half of the first millennium BCE, the period during which Greek colonization and Colchian settlements are attested by archaeological remains.</p>https://www.eg-quaternary-sci-j.net/68/119/2019/egqsj-68-119-2019.pdf
collection DOAJ
language deu
format Article
sources DOAJ
author H. Laermanns
S. M. May
D. Kelterbaum
G. Kirkitadze
S. Opitz
L. Navrozashvili
M. Elashvili
H. Brückner
spellingShingle H. Laermanns
S. M. May
D. Kelterbaum
G. Kirkitadze
S. Opitz
L. Navrozashvili
M. Elashvili
H. Brückner
Coastal lowland and floodplain evolution along the lower reaches of the Supsa River (western Georgia)
Eiszeitalter und Gegenwart
author_facet H. Laermanns
S. M. May
D. Kelterbaum
G. Kirkitadze
S. Opitz
L. Navrozashvili
M. Elashvili
H. Brückner
author_sort H. Laermanns
title Coastal lowland and floodplain evolution along the lower reaches of the Supsa River (western Georgia)
title_short Coastal lowland and floodplain evolution along the lower reaches of the Supsa River (western Georgia)
title_full Coastal lowland and floodplain evolution along the lower reaches of the Supsa River (western Georgia)
title_fullStr Coastal lowland and floodplain evolution along the lower reaches of the Supsa River (western Georgia)
title_full_unstemmed Coastal lowland and floodplain evolution along the lower reaches of the Supsa River (western Georgia)
title_sort coastal lowland and floodplain evolution along the lower reaches of the supsa river (western georgia)
publisher Copernicus Publications
series Eiszeitalter und Gegenwart
issn 0424-7116
2199-9090
publishDate 2019-07-01
description <p>In the southernmost part of the Colchian plain (Georgia), the Supsa and Rioni rivers represent important catchments for reconstructing Holocene landscape changes. Using granulometric methods, geochemical analyses and radiocarbon dating, we demonstrate that significant palaeoenvironmental changes have taken place in the surroundings of the Supsa fan since at least 4000 BCE. The initial foothill fan accumulation was prolonged by delta plain progradation. Due to continued fluvial sediment supply, mainly from the Rioni, the lagoon silted up and extended peat bogs formed east of the beach ridge complex. The Supsa fan first prograded northwards (since the third millennium BCE) and later shifted westwards, eventually following an avulsion of the Rioni. While Supsa deposits remain limited to the area of the fan and the modern estuary, the alluvial fines of the Rioni dominate the surrounding areas. The relative sea-level (RSL) index points of the region suggest a gradual RSL rise from <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M1" display="inline" overflow="scroll" dspmath="mathml"><mrow><mo>∼</mo><mo>-</mo><mn mathvariant="normal">9</mn></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="26pt" height="10pt" class="svg-formula" dspmath="mathimg" md5hash="9e7984693a9677c424a0f8a3cd0658c9"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="egqsj-68-119-2019-ie00001.svg" width="26pt" height="10pt" src="egqsj-68-119-2019-ie00001.png"/></svg:svg></span></span>&thinsp;<span class="inline-formula">m</span> between 4000 and 3500&thinsp;BCE to <span class="inline-formula">−3</span>/<span class="inline-formula">−2</span>&thinsp;<span class="inline-formula">m</span> below the modern sea level in the second half of the first millennium BCE, the period during which Greek colonization and Colchian settlements are attested by archaeological remains.</p>
url https://www.eg-quaternary-sci-j.net/68/119/2019/egqsj-68-119-2019.pdf
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