Reconstruction of water level variations during the last 4K years BP using magnetic and biological sedimentary proxies from Lake Fonck (northern Patagonia, Argentina)

IF 1.9 3区地球科学 Q3 GEOGRAPHY, PHYSICAL

Quaternary International Pub Date : 2025-05-29 DOI:10.1016/j.quaint.2025.109843

F. Petruzzella , M.A. Irurzun , J. Massaferro , C. Gogorza

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引用次数: 0

Abstract

Lakes have changed throughout history due to natural climatic variations and human impact. Lake Fonck is a lake of glacial origin located in northern Patagonia, Argentina, which has probably been also affected by these changes. A 160 cm sediment core from Lake Fonck covering the last 4000 years was analysed using a multiproxy approach. Magnetic measurements were conducted to determine the mineralogical composition, concentration and magnetic grain size to model water level variations in the lake and chironomid head capsules and organic matter were also analysed to provide additional and complementary information on productivity and environmental conditions. Although lake water levels and the chironomid assemblage varied over the entire period analysed, it was observed that the lake experienced the greatest environmental stress during the last 200 years. This period records the most acute droughts and floods of the last 4000 years, possibly related to human intervention in these ecosystems. This is the first study to combine environmental magnetic studies with biological (chironomid) analysis demonstrating the effectiveness of integrating multiple indicators of different sensitivities for climatic and environmental reconstructions.

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阿根廷北部巴塔哥尼亚丰克湖近4K年来水位变化的磁性和生物沉积代用资料重建

由于自然气候的变化和人类的影响，湖泊在整个历史中都发生了变化。丰克湖是一个冰川湖，位于阿根廷巴塔哥尼亚北部，可能也受到了这些变化的影响。使用多代理方法分析了丰克湖覆盖4000年的160厘米沉积物岩心。通过磁测量来确定矿物学组成、浓度和磁粒度，以模拟湖泊的水位变化，并分析了摇尾鱼的头部胶囊和有机质，以提供有关生产力和环境条件的额外和补充信息。在分析的整个时期，虽然湖泊水位和摇蚊组合发生了变化，但观察到湖泊在过去200年中经历了最大的环境压力。这一时期记录了过去4000年来最严重的干旱和洪水，可能与人类对这些生态系统的干预有关。这是第一个将环境磁研究与生物（chironomid）分析相结合的研究，证明了将不同灵敏度的多个指标整合在一起用于气候和环境重建的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Quaternary International 地学-地球科学综合

CiteScore

5.60

自引率

4.50%

发文量

336

审稿时长

3 months

期刊介绍： Quaternary International is the official journal of the International Union for Quaternary Research. The objectives are to publish a high quality scientific journal under the auspices of the premier Quaternary association that reflects the interdisciplinary nature of INQUA and records recent advances in Quaternary science that appeal to a wide audience. This series will encompass all the full spectrum of the physical and natural sciences that are commonly employed in solving Quaternary problems. The policy is to publish peer refereed collected research papers from symposia, workshops and meetings sponsored by INQUA. In addition, other organizations may request publication of their collected works pertaining to the Quaternary.