Sea level changes during of Earth’s glacial periods the reduce hydrostatic pressure on the ocean bottom. The decrease in hydrostatic pressure increases magmatic activity and, as a result, could lead to the formation of hydrothermal systems [9, 19]. Thus, a correlation between glacial periods and the origin of circulating hydrothermal systems is possible. To test the hypothesis about the relationship between the formation of hydrothermal systems and glacial periods, we compared the ²³⁰Th/U age dates of sulfide ores in the northern near-equatorial zone of the Mid-Atlantic Ridge and marine isotopic stages, which reflect glacial and interglacial periods. The comparison shows that the glacial periods coincide only with the onset of formation of ore objects associated with basalts within magmatic segments of the Mid-Atlantic Ridge. Conversely, the periods of formation of ore objects associated with tectonic segments of the ridge within oceanic complexes are unrelated to glaciation. We hypothesize that the relationship between glaciations and the origin of hydrothermal systems is determined by differences in the geological conditions for the formation of seafloor massive sulfides within slow-spreading ridges.

中文翻译：

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全球冰川对大西洋中脊热液活动起源的影响

地球冰川期的海平面变化降低了海底的静水压力。静水压力的降低增加了岩浆活动，结果可能导致形成热液系统[9，19]。因此，冰川期与循环水热系统起源之间的相关性是可能的。为了检验关于热液系统形成与冰川期之间关系的假设，我们比较了²³⁰大西洋中脊北部近赤道带和海洋同位素阶段的硫化矿石的Th / U年龄日期反映了冰川期和冰川间期。比较表明，冰川期仅与中大西洋海脊岩浆段内玄武岩相关的成矿对象的形成相吻合。相反，与海洋复合物中的山脊构造段相关的矿石物体的形成时期与冰川作用无关。我们假设冰川作用与热液系统起源之间的关系是由缓慢扩散的海脊内形成海底块状硫化物的地质条件差异决定的。