Geochronological Study of Hydrothermal Precipitates in the Northern Equatorial Area of the Mid-Atlantic Ridge

IF 1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geotectonics Pub Date : 2024-03-10 DOI:10.1134/s001685212307004x

G. A. Cherkashov, A. V. Firstova, A. S. Bich, K. A. Kuksa, A. A. Sukhanova, E. S. Yakovenko, T. V. Stepanova, V. Yu. Kuznetsov, A. E. Musatov, A. Yu. Petrov, F. E. Maksimov, B. E. Beltenev

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Abstract—

The results of ²³⁰Th/U dating of massive sulfides and metalliferous sediments (288 and 245 analyses, respectively) of hydrothermal sites in the northern equatorial area of the Mid-Atlantic Ridge (MAR) from 12° to 20° N are presented. The maximum and average ages of sulfides are 223 ± 38.2 and 80.5 ka, respectively. The comparison of ages of massive sulfides from various MAR hydrothermal sites showed asynchronous stages of hydrothermal activity along the ridge axis indicating the features of tectonic activity and magmatism, which control the hydrothermal activity within each region. The glaciation periods, which record the activation and low- and high-temperature hydrothermal activity, are an exception. A direct positive correlation between the age of a hydrothermal site and its distance from the axial ridge zone is typical of mafic-related hydrothermal sites in contrast to ultramafic-related hydrothermal sites, which is related to the different scenarios of the formation of these two types of sulfide mineralization within slow-spreading ridges. The ages of sulfides and sediments have been jointly analyzed based on the example of the Pobeda and Semenov hydrothermal sites. The interpretation of data on sediments indicates the continuous character of hydrothermal activity, which is partly supported by the age of sulfides.

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大西洋中脊北赤道地区热液沉淀物的地质年代研究

摘要--介绍了对北纬12°至20°大西洋中脊（MAR）北部赤道地区热液地点的块状硫化物和含金属沉积物（分别进行了288次和245次分析）进行230Th/U测年的结果。硫化物的最大年龄和平均年龄分别为 223 ± 38.2 ka 年和 80.5 ka 年。通过比较大西洋中脊各热液地点块状硫化物的年龄，发现热液活动沿海脊轴线的不同步阶段表明了构造活动和岩浆活动的特征，而构造活动和岩浆活动控制着各区域内的热液活动。冰川期是一个例外，它记录了低温和高温热液活动的激活过程。热液地点的年龄与其与轴向海脊带的距离呈直接正相关，这在与黑云母有关的热液地点与与超黑云母有关的热液地点之间非常典型，这与这两种类型的硫化物矿化在缓慢扩张的海脊内形成的不同情况有关。根据 Pobeda 和 Semenov 热液遗址的实例，对硫化物和沉积物的年龄进行了联合分析。对沉积物数据的解释表明热液活动具有连续性，硫化物的年龄也部分证明了这一点。

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来源期刊

Geotectonics 地学-地球化学与地球物理

CiteScore

1.90

自引率

9.10%

发文量

审稿时长

3 months

期刊介绍： Geotectonics publishes articles on general and regional tectonics, structural geology, geodynamics, and experimental tectonics and considers the relation of tectonics to the deep structure of the earth, magmatism, metamorphism, and mineral resources.