化石与现代鱼齿元素组成、87Sr/86Sr-143Nd/144Nd对比及深海沉积物稀土元素富集意义

IF 2.8 2区生物学 Q1 MARINE & FRESHWATER BIOLOGY

Frontiers in Marine Science Pub Date : 2025-04-07 DOI:10.3389/fmars.2025.1534727

Zhijie Xu, Xiaoyu Zhang, Kongyang Zhu, Mu Huang, Miao Yu, Zheng Li, Zhongrong Qiu, Yanfang Lu

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引用次数: 0

摘要

鱼牙化石是深海沉积物中稀土元素的重要载体。同时，这些化石中的87Sr/86Sr-143Nd/144Nd在古海洋学中得到了广泛的应用。然而，稀土元素进入鱼齿的时间和方式尚不明确，这阻碍了对深海沉积物中稀土元素富集机制的阐明，87Sr/86Sr-143Nd/144Nd在古海洋学中的有效性也受到质疑。本文研究了深海沉积物中现代鱼牙齿和化石鱼牙齿中稀土元素、主微量元素和87Sr/86Sr-143Nd/144Nd的含量。结果表明，元素地球化学性质和氧化还原环境是控制它们在鱼牙中富集过程的主要因素。在活鱼的生理过程和化石沉积后的两个不同阶段，至少可以划分出三类微量元素：(1)I型元素主要属于IA、IIA、IIIA、IVA及其过渡族，具有活性的化学性质，在鱼的一生中进入鱼的牙齿；(2) II型代表IA、VA、过渡元素和锕系元素，在不同氧化还原条件下，从活鱼牙到沉积后化石中以变价不间断地富集；(3) III型是经过氧化或亚氧化沉积后才积累起来的元素，是镧系元素和稀有分散元素族的成员，原子半径大，化学活性强。鱼齿化石中Sr和Nd、87Sr/86Sr和143Nd/144Nd富集过程差异明显，可能代表着不同的物质来源，在古海洋学研究中应谨慎使用。沉积后鱼牙化石中87Sr/86Sr的不断恢复会改变鱼牙附近海水中87Sr/86Sr的原始记录，但Sr的含量保持不变。对于143Nd/144Nd，沉积后Nd进入化石后，由于同构晶格饱和，颗粒与孔液之间的143Nd/144Nd交换逐渐停止。鱼类牙齿化石的nd /144Nd可以提供更多关于深海海水-沉积物界面的信息。本研究阐明了深海沉积物中稀土元素的富集机理，同时也为谨慎利用化石中的87Sr/86Sr和143Nd/144Nd提供了前提条件。

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Comparison of elemental composition and 87Sr/86Sr-143Nd/144Nd between fossil and modern fish teeth and the significance of the enrichment of REE in deep-sea sediments

Fossil fish teeth are important carriers of rare earth elements (REEs) in deep-sea sediments. Meanwhile, 87Sr/86Sr-143Nd/144Nd in these fossils have been widely used in paleoceanography. However, when and how REEs enter the fish teeth remains ambiguous, which hinders elucidating the enrichment mechanism of REEs in deep-sea sediments, and the effectiveness of 87Sr/86Sr-143Nd/144Nd in paleoceanography is doubted. This study examined the contents of REEs, major and trace elements, and 87Sr/86Sr-143Nd/144Nd in modern fish teeth and in fossil fish teeth from deep-sea sediments. The results indicated that elemental geochemical properties and a redox environment are the main factors controlling their enrichment process in fish teeth. At least three categories of trace elements are classified during two different stages (physiological process of living fish and post-deposition of fossils): (1) elements of Type I mainly belong to IA, IIA, IIIA, IVA, and transition group with active chemical properties, entering into the fish teeth during life; (2) Type II represents elements from the IA, VA, transition elements, and Actinides groups, and are enriched uninterruptedly from the living fish teeth to the post-deposition fossils with variable valences under different redox conditions; (3) Type III are elements accumulated only after deposition under oxidizing or suboxidizing and are members of Lanthanides and rare dispersed elements groups with a large atomic radius and strong chemical activity. The distinctly different enrichment processes of Sr and Nd, 87Sr/86Sr, and 143Nd/144Nd in fossil fish teeth may represent different material sources and should be cautiously employed in paleoceanography. The continuous rehabilitation of 87Sr/86Sr in fossil fish teeth after deposition would change the original 87Sr/86Sr of seawater recorded near fish teeth but the content of Sr remains unchanged. As for 143Nd/144Nd, when Nd enters the fossils after deposition, the exchange of 143Nd/144Nd between particles and pore liquid gradually ceases due to the saturation of the isomorphism lattice. 143Nd/144Nd of fossil fish teeth may provide more information about deep seawater at the seawater-sediment interface. This study elucidates the enrichment mechanism of REEs in deep-sea sediments and the cautious utilization of 87Sr/86Sr and 143Nd/144Nd of fossils is a prerequisite.

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来源期刊

Frontiers in Marine Science Agricultural and Biological Sciences-Aquatic Science

CiteScore

5.10

自引率

16.20%

发文量

2443

审稿时长

14 weeks

期刊介绍： Frontiers in Marine Science publishes rigorously peer-reviewed research that advances our understanding of all aspects of the environment, biology, ecosystem functioning and human interactions with the oceans. Field Chief Editor Carlos M. Duarte at King Abdullah University of Science and Technology Thuwal is supported by an outstanding Editorial Board of international researchers. This multidisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers, academics, policy makers and the public worldwide. With the human population predicted to reach 9 billion people by 2050, it is clear that traditional land resources will not suffice to meet the demand for food or energy, required to support high-quality livelihoods. As a result, the oceans are emerging as a source of untapped assets, with new innovative industries, such as aquaculture, marine biotechnology, marine energy and deep-sea mining growing rapidly under a new era characterized by rapid growth of a blue, ocean-based economy. The sustainability of the blue economy is closely dependent on our knowledge about how to mitigate the impacts of the multiple pressures on the ocean ecosystem associated with the increased scale and diversification of industry operations in the ocean and global human pressures on the environment. Therefore, Frontiers in Marine Science particularly welcomes the communication of research outcomes addressing ocean-based solutions for the emerging challenges, including improved forecasting and observational capacities, understanding biodiversity and ecosystem problems, locally and globally, effective management strategies to maintain ocean health, and an improved capacity to sustainably derive resources from the oceans.