Abstract

The first results of studies of vertical particle fluxes in a hydrothermal sedimentary system of a subpolar area of the Mid-Atlantic Ridge under the influence of hydrodynamic factors that affect the distribution of hydrothermal plumes are discussed. Sediment traps were deployed in the Trollveggen and Soria Moria hydrothermal vent fields in the southern part of the Mohns Ridge for a short period during the 75th cruise of the R/V Akademik Mstislav Keldysh in June 2019. The particles were deposited in the bottom layer under a dominant northeastern water transfer, which coincides with the spatial orientation of the rift valley in the area studied. Numerous short-period positive temperature anomalies of up to 0.86°C were registered. The particle fluxes in the bottom layer of this area are much lower than in the hydrothermal vent fields of the southernmost areas of the Mid-Atlantic Ridge. A significant amount of hydrothermal minerals (barite, sulfides, etc.) were detected in trap matter of the bottom layers. The main difference between the hydrothermal vent fields is the absence of gypsum crystals and the lower content of fibrous aggregates (filaments and spheres) of amorphous silica in the Soria Moria field.

中文翻译：

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莫恩斯山脊南部的热液排放场中的颗粒通量

摘要

讨论了在影响水热羽流分布的水动力因素的影响下，中大西洋海陆亚极地区热液沉积系统中垂直颗粒通量研究的初步结果。在R / V Akademik Mstislav Keldysh的第75趟航行中，在短期内将沉淀物诱捕器部署在了Mohns Ridge南部的Trollveggen和Soria Moria热液喷口中在2019年6月。这些颗粒沉积在主要的东北部水迁移下的底层，这与所研究区域的裂谷的空间方向一致。记录到了高达0.86°C的许多短期正温度异常。该区域底层的颗粒通量远低于大西洋中脊最南端区域的热液喷口区域。在底层的捕集物中检测到大量的热液矿物（重晶石，硫化物等）。热液喷口场之间的主要区别在于，在Soria Moria场中，不存在石膏晶体，且非晶态二氧化硅的纤维状聚集体（细丝和球体）含量较低。