Heavy metals from Kueishantao shallow-sea hydrothermal vents, offshore northeast Taiwan
Heavy metals from Kueishantao shallow-sea hydrothermal vents, offshore northeast Taiwan
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DOI：
10.1016/j.jmarsys.2016.11.018
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发表时间：
2018-04-01
影响因子：
2.8
通讯作者：
Ye, Ying
中科院分区：
文献类型：
--
作者：
Chen, Xue-Gang;Lyu, Shuang-Shuang;Ye, Ying
浅水热液喷口是重金属的一个来源，导致重金属在设法生活在极端环境条件下的海洋生物体内积累。这是在龟山岛（KST）浅海喷口系统的情况下，在台湾东北部近海，喷口流体和环境海水中的重金属分布知之甚少。这个浅喷口是一个很好的天然实验室，可以了解重金属和挥发性金属在附近水柱和生态系统中的行为。在这里，我们调查了海底排放的重金属从KST领域及其对周围表层海水的影响。喷口流体和垂直羽流中的重金属总浓度比上覆海水高1-3个数量级。与深海热液系统相比，估计的KST端元流体显示出低得多的过渡金属浓度（例如，铁和锰），但有毒金属，如铅和砷的浓度相当。这可能是由于KST反应区和输送流体的温度较低。大部分的重金属（Fe，Mn，As，Y和Ba）的羽流和海水主要来自热液喷口，而Cd和Pb主要是由外部来源，如污染的沃茨（人为来源）。表层海水中重金属的空间分布表明，海底排气影响周围海水。然而，KST热液活动的可测量影响是相当局部的，仅限于
Shallow water hydrothermal vents are a source of heavy metals leading to their accumulation in marine organisms that manage to live under extreme environmental conditions. This is the case at Kueishantao (KST) shallow-sea vents system offshore northeast Taiwan, where the heavy metal distribution in vent fluids and ambient sea-water is poorly understood. This shallow vent is an excellent natural laboratory to understand how heavy and volatile metals behave in the nearby water column and ecosystem. Here, we investigated the submarine venting of heavy metals from KST field and its impact on ambient surface seawater. The total heavy metal concentrations in the vent fluids and vertical plumes were 1-3 orders of magnitude higher than the overlying seawater values. When compared with deep-sea hydrothermal systems, the estimated KST end-member fluids exhibited much lower concentrations of transition metals (e.g., Fe and Mn) but comparable concentrations of toxic metals such as Pb and As. This may be attributed to the lower temperature of the KST reaction zone and transporting fluids. Most of the heavy metals (Fe, Mn, As, Y, and Ba) in the plumes and seawater mainly originated from hydrothermal venting, while Cd and Pb were largely contributed by external sources such as contaminated waters (anthropogenic origin). The spatial distribution of heavy metals in the surface seawater indicated that seafloor venting impacts ambient seawater. The measurable influence of KST hydrothermal activity, however, was quite localized and limited to an area of