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Archives of short-term fluid flow dynamics and possible influence of human activities at methane seeps: Evidence from high-resolution element geochemistry of chemosynthetic bivalve shells
Frontiers in Marine Science ( IF 3.7 ) Pub Date : 2022-08-12 , DOI: 10.3389/fmars.2022.960338
Xudong Wang, Danling Fan, Steffen Kiel, Shanggui Gong, Qiangyong Liang, Jun Tao, Duofu Chen, Dong Feng

The natural dynamics of fluid flow at methane seeps and increasingly human activities influence the biogeochemistry of the microenvironment and further determine the activity of the chemosynthetic communities within these ecosystems. However, ways to reconstruct short-term fluid flow dynamics and to decipher the influence of scientific exploration at seeps are limited. In this study, we present high-resolution trace elements/Ca ratios (Li/Ca, Mg/Ca, Ti/Ca, Mn/Ca, Co/Ca, Cu/Ca, Zn/Ca, Sr/Ca, Zr/Ca, Mo/Ca, Ba/Ca, Th/Ca and U/Ca ratios) from the shells of two species of chemosymbiotic bivalves (the thiotrophic vesicomyid clam Archivesica marissinica and the methanotrophic mussel Gigantidas haimaensis) from the Haima cold seeps of the South China Sea. We found that the complex distribution patterns of some trace elements (Mg/Ca, Sr/Ca, Mo/Ca and U/Ca ratios) in G. haimaensis are largely controlled by mineral composition or age. The observation of Co/Ca and Ba/Ca ratios in both species indicate strong physiological and environmental control on the incorporation of trace elements during the biomineralization process. Besides, the distribution patterns of other trace elements provide information that can be used to discuss open issues such as the loss of trace elements after death of the bivalves, and the possible influence of human activities such as sediment disturbance. Overall, this study emphasizes the potential for using high-resolution element geochemistry of seep bivalve shells to reveal the physiological and environmental factors that control the growth of bivalves, and to elucidate the potential history of fluid discharge at cold seeps.



中文翻译:

甲烷渗漏处短期流体流动动力学和人类活动可能影响的档案:来自化学合成双壳贝壳的高分辨率元素地球化学的证据

甲烷渗漏处流体流动的自然动力学和越来越多的人类活动影响了微环境的生物地球化学,并进一步决定了这些生态系统中化学合成群落的活动。然而,重建短期流体流动动力学和破译科学勘探对渗漏影响的方法是有限的。在这项研究中,我们提出了高分辨率微量元素/Ca 比率(Li/Ca、Mg/Ca、Ti/Ca、Mn/Ca、Co/Ca、Cu/Ca、Zn/Ca、Sr/Ca、Zr/Ca 、Mo/Ca、Ba/Ca、Th/Ca 和 U/Ca 比率)来自两种化学共生双壳贝类(硫营养型 vesicomyid 蛤蜊马里西尼卡档案馆和甲烷氧化贻贝海马巨蟒) 来自南海的海马冷泉。我们发现一些微量元素(Mg/Ca、Sr/Ca、Mo/Ca 和 U/Ca 比率)的复杂分布模式海马葛很大程度上受矿物成分或年龄的控制。对两种物种中 Co/Ca 和 Ba/Ca 比率的观察表明,在生物矿化过程中对微量元素的掺入有很强的生理和环境控制。此外,其他微量元素的分布模式提供了可用于讨论开放性问题的信息,例如双壳贝类死亡后微量元素的流失,以及人类活动(如沉积物扰动)可能产生的影响。总体而言,本研究强调了利用渗漏双壳贝壳的高分辨率元素地球化学来揭示控制双壳贝类生长的生理和环境因素,并阐明冷渗漏处流体排放的潜在历史的潜力。

更新日期:2022-08-12
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