苏普萨河下游沿海低地和漫滩的演变(格鲁吉亚西部)

Hannes Laermanns, S. M. May, Daniel Kelterbaum, G. Kirkitadze, S. Opitz, Levan Navrozashvili, M. Elashvili, H. Brückner
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引用次数: 3

摘要

摘要在佐治亚州科尔喀斯平原的最南端,苏萨河和里奥尼河是重建全新世景观变化的重要流域。通过颗粒测定法、地球化学分析和放射性碳测年,我们证明了至少在公元前4000年以来,苏普萨扇周围发生了显著的古环境变化。三角洲平原的进积延长了最初的山麓扇堆积。由于持续的河流沉积物供应(主要来自里奥尼河),泻湖淤塞,延伸的泥炭沼泽在海滩山脊综合体以东形成。苏萨扇首先向北推进(自公元前三千年以来),后来向西移动,最终随着里奥尼的撕裂。虽然苏萨沉积物仍然局限于扇和现代河口地区,但里奥尼的冲积粉层主导着周围地区。该地区的相对海平面(RSL)指数点表明,相对海平面在公元前4000年至3500年间从-9米逐渐上升到公元前1千年下半叶的现代海平面以下- 3/ - 2米,考古遗迹证实了希腊殖民和科尔喀斯定居点的时期。
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Coastal lowland and floodplain evolution along the lower reaches of the Supsa River (western Georgia)
Abstract. 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 ∼-9 m between 4000 and 3500 BCE to −3/−2 m 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.
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