The geodynamic and limnological evolution of Balkan Lake Ohrid, possibly the oldest extant lake in Europe

IF 2.4 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL Boreas Pub Date : 2022-10-31 DOI:10.1111/bor.12601
Bernd Wagner, Paul Tauber, Alexander Francke, Niklas Leicher, Steven A. Binnie, Aleksandra Cvetkoska, Elena Jovanovska, Janna Just, Jack H. Lacey, Zlatko Levkov, Katja Lindhorst, Katerina Kouli, Sebastian Krastel, Konstantinos Panagiotopoulos, Arne Ulfers, Dušica Zaova, Timme H. Donders, Andon Grazhdani, Andreas Koutsodendris, Melanie J. Leng, Laura Sadori, Mirko Scheinert, Hendrik Vogel, Thomas Wonik, Giovanni Zanchetta, Thomas Wilke
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引用次数: 3

Abstract

Studies of the upper 447 m of the DEEP site sediment succession from central Lake Ohrid, Balkan Peninsula, North Macedonia and Albania provided important insights into the regional climate history and evolutionary dynamics since permanent lacustrine conditions established at 1.36 million years ago (Ma). This paper focuses on the entire 584-m-long DEEP sediment succession and a comparison to a 197-m-long sediment succession from the Pestani site ~5 km to the east in the lake, where drilling ended close to the bedrock, to unravel the earliest history of Lake Ohrid and its basin development. 26Al/10Be dating of clasts from the base of the DEEP sediment succession implies that the sedimentation in the modern basin started at c. 2 Ma. Geophysical, sedimentological and micropalaeontological data allow for chronological information to be transposed from the DEEP to the Pestani succession. Fluvial conditions, slack water conditions, peat formation and/or complete desiccation prevailed at the DEEP and Pestani sites until 1.36 and 1.21 Ma, respectively, before a larger lake extended over both sites. Activation of karst aquifers to the east probably by tectonic activity and a potential existence of neighbouring Lake Prespa supported filling of Lake Ohrid. The lake deepened gradually, with a relatively constant vertical displacement rate of ~0.2 mm a−1 between the central and the eastern lateral basin and with greater water depth presumably during interglacial periods. Although the dynamic environment characterized by local processes and the fragmentary chronology of the basal sediment successions from both sites hamper palaeoclimatic significance prior to the existence of a larger lake, the new data provide an unprecedented and detailed picture of the geodynamic evolution of the basin and lake that is Europe’s presumed oldest extant freshwater lake.

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巴尔干奥赫里德湖的地球动力学和湖泊学演变,可能是欧洲现存最古老的湖泊
对奥赫里德湖中部、巴尔干半岛、北马其顿和阿尔巴尼亚的447 m深址沉积物演替的研究,为136万年前建立永久湖泊条件以来的区域气候历史和进化动力学提供了重要的见解。本文重点研究了整个584米长的DEEP沉积物演替,并与Pestani遗址以东约5公里处的197米长的沉积物演替进行了比较,在那里钻探结束于基岩附近,以揭示Ohrid湖的早期历史及其盆地发育。26Al/10Be定年表明,现代盆地的沉积开始于c. 2 Ma。地球物理、沉积学和微古生物学数据允许将时间信息从DEEP转换到Pestani演替。直到1.36 Ma和1.21 Ma,在一个更大的湖泊延伸到这两个地点之前,河流条件、松弛水条件、泥炭形成和/或完全干燥分别在DEEP和Pestani地点盛行。东部岩溶含水层的活化可能是由于构造活动和邻近的普雷斯帕湖的潜在存在支持了奥赫里德湖的充填。湖泊逐渐加深,中部和东部横向盆地之间的垂直位移速率相对恒定,为~0.2 mm a−1,推测在间冰期湖水深度较大。虽然以当地过程为特征的动力环境和两个地点的基底沉积物序列的零碎年代学阻碍了在更大湖泊存在之前的古气候意义,但新的数据提供了一个前所未有的详细的盆地和湖泊的地球动力学演化图像,被认为是欧洲现存最古老的淡水湖。
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来源期刊
Boreas
Boreas 地学-地球科学综合
CiteScore
5.90
自引率
4.50%
发文量
36
审稿时长
>12 weeks
期刊介绍: Boreas has been published since 1972. Articles of wide international interest from all branches of Quaternary research are published. Biological as well as non-biological aspects of the Quaternary environment, in both glaciated and non-glaciated areas, are dealt with: Climate, shore displacement, glacial features, landforms, sediments, organisms and their habitat, and stratigraphical and chronological relationships. Anticipated international interest, at least within a continent or a considerable part of it, is a main criterion for the acceptance of papers. Besides articles, short items like discussion contributions and book reviews are published.
期刊最新文献
Issue Information Boreas Reviewers, volume 53 Late Middle Pleistocene (MIS 11-6) in Europe – introduction Late Middle Pleistocene Wolstonian Stage (MIS 6) glaciation in lowland Britain and its North Sea regional equivalents – a review Issue Information
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