放射性碳定年和复杂沉积学研究揭示了Pețea湖(罗马尼亚西北部)温泉补给的晚更新世至全新世古水文史

IF 2.3 Q2 GEOSCIENCES, MULTIDISCIPLINARY Quaternary Pub Date : 2023-06-12 DOI:10.3390/quat6020037
S. Gulyás, P. Sümegi
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引用次数: 1

摘要

了解沉积过程对过去水文地质和气候变化的响应,并捕捉千年尺度的变化,是湖泊古环境研究的重点。这项研究首次提供了罗马尼亚西北部小型温泉湖Pețea的高分辨率年表和沉积数据,并揭示了该湖拥有独特特有动物群的进化史。它体积小,水源单一,对水文变化特别敏感。在最近的一段时间里,对热水的过度开发导致了湖泊的完全干涸和动物群的灭绝。然而,过去环境因素的时空变化,特别是湖泊水位和水温的波动,一定对当地软体动物的生存和进化产生了重大影响。这一事实使得这项研究显得尤为重要。根据我们的研究结果,发生了三阶段的沉积演化,主要受区域记录中也可见的主要气候驱动的水文变化控制,即17.5–14.5 ka浅富营养化湖、14.5–5.5 ka贫营养化富碳酸盐湖和5.5–0.5 ka浅富养化湖。由于气候干燥,11.7–10.2 ka的主要低点随后水位逐渐上升,最高可达5 ka,随后水位下降。湖泊水位波动和沉积相的主要控制因素是地下浅层岩溶水系统补给量的反复增加/减少导致热水输入的变化。晚冰川期热水排放的驱动因素与全新世不同。正是14.5卡BP的气候变暖和区域冰盖的融化,加上降水量的增加,通过补给地下热水系统,形成了一个贫营养湖泊。相反,在全新世期间,主要气候强迫导致的水分可利用性的增加/减少控制了热水补给、侵蚀和湖泊水位的波动。
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Late Pleistocene to Holocene Palaeohydrological History of the Thermal-Spring-Fed Lake Pețea (NW Romania) Revealed by Radiocarbon Dating and Complex Sedimentological Investigations
Understanding sedimentation processes in response to past hydrogeological and climatic changes and capturing millennial-scale variations is a key focus of lacustrine paleoenvironmental research. This study presents the first high-resolution chronology and sedimentary data for the small thermal-spring-fed Lake Pețea, NW Romania, and unravels the evolutionary history of the lake harboring a unique endemic fauna. Its small size and single source of water make it particularly sensitive to hydrological changes. In the recent past, over-exploitation of the thermal water has led to the complete drying up of the lake and the extinction of its fauna. Nevertheless, past spatio-temporal variation of environmental factors, in particular the fluctuation of lake levels and water temperature, must have had a significant impact on the survival and evolution of the endemic mollusk fauna. This fact makes this study particularly important. Based on our results, a three-stage sedimentary evolution occurred, mainly controlled by major climate-driven hydrological changes also seen in regional records, i.e., 17.5–14.5 ka shallow eutrophic lake, 14.5–5.5 ka oligotrophic carbonate-rich lake, and 5.5–0.5 ka shallow eutrophic lake. A major lowstand at 11.7–10.2 ka due to drier climate was followed by progressively rising water levels up to 5 ka followed by a drop. The main control on lake level fluctuations and sedimentary phases was the varying input of thermal water due to recurring increased/decreased recharge of the underground shallow karst water system. The driving factor of thermal water discharge was different during the Late Glacial than the Holocene. It was the warming of the climate at 14.5 ka cal BP and melting of regional ice sheets in addition to increased precipitation that created an oligotrophic lake by recharging the underground thermal water system. Conversely, during the Holocene, increasing/decreasing moisture availability driven by major climate forcings was in control of thermal water recharge, erosion, and fluctuating lake levels.
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来源期刊
Quaternary
Quaternary GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.30
自引率
4.30%
发文量
44
审稿时长
11 weeks
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