Biogeochemical cycling of trace elements and nutrients in ferruginous waters: Constraints from a deep oligotrophic ancient lake

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
David J. Janssen, Adrianus Damanik, Nicolas Tournier, Julie Tolu, Lenny Winkel, Sri Yudawati Cahyarini, Hendrik Vogel
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引用次数: 0

Abstract

Iron‐rich, ferruginous waters were the dominant geochemical regime for most of Earth's history. Modern ferruginous waters are found in stratified, sulfur‐poor lakes, and serve as crucial analogs for biogeochemical cycling throughout Earth's past. Here we present the first depth‐resolved data of physical structure, nutrients and trace elements from Lake Poso (Indonesia), a deep oligotrophic ancient lake. Lake Poso is ferruginous, with anoxia below ~ 90 m depth, placing it among the world's largest ferruginous lakes. Physical stratification is weaker than other tropical anoxic lakes, indicating sensitivity for paleoclimate reconstructions. Trace elements and nutrients are predominantly shaped by the oxic–anoxic transition. Manganese– and Fe oxyhydroxide–driven biogeochemical cycling occurs at distinct depth horizons, with Co and Ni controlled by Mn and showing shallow release in anoxic waters, while V, Cr, P, and As are controlled by Fe, with release in surface sediments and diffusive transport. Chromium is nonquantitatively removed in anoxic waters, in contrast to widespread assumptions in Cr‐based paleoreconstructions. Oxycline U and Se removal corresponds to a local N minimum, suggesting biological reduction and/or uptake. These first ferruginous water Se data also show removal in sediments, indicating sediment signals reflect multiple removal processes and informing Se‐based paleoreconstructions, while the absence of sediment U removal contrasts other anoxic basins. A comparison with other ferruginous lakes demonstrates how local influences drive deviations from expectations in other systems, and highlight common, generalizable ferruginous basin features. Therefore, these data will guide research in ferruginous settings across space and time, and improve paleoreconstructions from ferruginous sediment records.
铁质水体中微量元素和营养物质的生物地球化学循环:来自深层寡营养古湖的制约因素
在地球历史的大部分时间里,富含铁的铁锈水是地球化学的主流。现代铁锈质水体存在于分层、贫硫的湖泊中,是整个地球过去生物地球化学循环的重要模拟物。在这里,我们首次展示了来自波索湖(印度尼西亚)的物理结构、营养物质和微量元素的深度分辨数据,波索湖是一个深层寡营养的古老湖泊。波索湖为铁质湖泊,水深约 90 米以下为缺氧状态,是世界上最大的铁质湖泊之一。与其他热带缺氧湖泊相比,波索湖的物理分层较弱,这表明它对古气候重建具有敏感性。微量元素和营养物质主要受缺氧-缺氧转变的影响。锰和铁氧氢氧化物驱动的生物地球化学循环发生在不同的深度层,钴和镍受锰控制,在缺氧水体中浅层释放,而钒、铬、磷和砷受铁控制,在表层沉积物中释放并扩散迁移。铬在缺氧水体中没有被定量去除,这与基于铬的古重建中的普遍假设不同。氧化态铀和硒的去除与当地氮的最小值相对应,这表明存在生物还原和/或吸收。这些首批铁屑水Se数据还显示了沉积物的去除,表明沉积物信号反映了多种去除过程,并为基于Se的古重建提供了信息,而沉积物U去除的缺失与其他缺氧盆地形成了鲜明对比。与其他铁质湖泊的比较显示了当地影响如何导致其他系统偏离预期,并突出了常见的、可推广的铁质盆地特征。因此,这些数据将指导跨时空的铁质环境研究,并改善铁质沉积物记录的古重建。
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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