Dispersion and Intersection of Hydrothermal Plumes in the Manus Back-Arc Basin, Western Pacific
Dispersion and Intersection of Hydrothermal Plumes in the Manus Back-Arc Basin, Western Pacific
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DOI：
10.1155/2020/4260806
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发表时间：
2020-02
期刊：
影响因子：
1.7
通讯作者：
Z. Zeng;Xiaoyuan Wang;B. Murton;Haiyan Qi;B. Lehrmann;Xiaohui Li;Zuxing Chen;Yunchao Shu
中科院分区：
文献类型：
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作者：
Z. Zeng;Xiaoyuan Wang;B. Murton;Haiyan Qi;B. Lehrmann;Xiaohui Li;Zuxing Chen;Yunchao Shu
热液羽流的组成反映了海底热液流体的物理和化学特征，而这些特征又反映了寄主岩石和海底下的反应条件以及在羽流分散和老化时改变羽流的水柱过程。在这里，我们表明热液羽流的浑浊度、水流、pH值、溶解Fe（dFe）和溶解Mn（dMn）组成可以用来了解海底地质环境中热液系统的空间分布和来源。数据采集自18个水文观测站，其中8个观测站的水柱样本采集自2015年“科雪”号MANUS航次。结果表明，撒旦米尔斯羽和芬威羽分别上升到海底以上约140米和220米。在撒旦米尔斯羽，dFe仍然长于dMn在横向羽扩散。在PACMANUS热液场中，Satanic米尔斯烟羽和Fenway烟羽在1625 ~ 1550 m之间有明显的交汇，且混合烟羽的分散趋势受不同深度流速的影响。马努斯海盆海柱的物理和化学性质受到高Mn、高铁和低Mg喷流流体输入的影响。的浊度和dFe，dMn，溶解镁浓度的部分羽近撒旦米尔斯，芬威，Desmos喷口站点一般较高（浊度，Mn和Fe）和较低（Mg）比那些在部分羽更远的喷口站点。这意味着，接近其喷口流体源的羽流（据解释，这些羽流的年龄相对较短）随着时间的推移发生了化学分散，其浓度变得与远离其喷口流体源的羽流更加相似。
The composition of hydrothermal plumes reflects the physical and chemical characteristics of seafloor hydrothermal fluids, which in turn reflects the host rock and subseafloor reaction conditions as well as the water column processes that act to alter the plumes as they disperse and age. Here, we show that the turbidity, current, pH value, dissolved Fe (dFe), and dissolved Mn (dMn) compositions of hydrothermal plumes can be used to understand the spatial distribution and source of hydrothermal systems in the submarine geological environment. Data were obtained from 18 hydrocast stations, among which the water column samples were collected at 8 stations during the MANUS cruise of R/V KEXUE in 2015. The results showed that the Satanic Mills plume and Fenway plume rose approximately 140 m and 220 m above the seafloor, respectively. In the Satanic Mills plume, dFe remained longer than dMn during lateral plume dispersal. There was a clear intersection of the Satanic Mills plume and Fenway plume between 1625 m and 1550 m in the PACMANUS hydrothermal field, and the varied dispersion trends of the mixed plumes were affected by current velocities at different depths. The physical and chemical properties of the seawater columns in the Manus Basin were affected by the input of high-Mn, high-Fe, and low-Mg vent fluids. The turbidity and dFe, dMn, and dissolved Mg concentrations in the sections of the plumes proximal to the Satanic Mills, Fenway, and Desmos vent sites were generally higher (turbidity, Mn, and Fe) and lower (Mg) than those in the sections of the plumes that were more distal from the vent sites. This implied that the plumes proximal to their vent fluid sources, which were interpreted to have relatively young ages, dispersed chemically over time, and their concentrations became more similar to those of the plumes that were more distal from their vent fluid sources.