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<p>The hydrothermal signatures of mid-ocean ridge sediments are crucial geochemical data providing insights into investigating hydrothermal anomalies and locating seafloor massive sulfide deposits. This paper outlines the geochemical features of 24 surface sediments and one sediment core (26V-GC01, 294 cm) along the South Mid-Atlantic Ridge (SMAR) from 18°S to 22°S, an area where hydrothermal active fields have yet to be discovered. The surface sediments mainly consist of biogenic carbonates, aluminosilicates, and hydrothermal Fe-Mn (oxy) oxides. The core sediments primarily comprise organic matter, detrital materials, hydrothermal components, and substances scavenged from seawater. The rare Earth element (REE) patterns suggest the presence of hydrothermal contributions within the surface and core sediments. The enrichment factors for Fe, Mn, Cu, and Zn in surface sediments suggest these metals are concentrated at the 19°S, 21°S, and 21.5°S segments, further indicating their potential as hydrothermal active fields. Downcore variations of Fe, Mn, P, Cu, Pb, V, and Co suggest at least six episodes of hydrothermal activity. The impact of hydrothermal processes on the sediments from SMAR 18°S to 22°S indicates that the study area has the potential to host a significant number of hydrothermal active fields.</p>

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Hydrothermal signatures in sediments along the South Mid-Atlantic Ridge from 18°S to 22°S: implications for potential hydrothermal fields

  • 期刊论文

  • 发表日期：

    2025年1月2日

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  • Peng Yang,
  • Chuanshun Li,
  • Jihua Liu,
  • Baoju Yang,
  • Jun Ye,
  • Bing Li,
  • Yuan Dang,
  • Dewen Du

摘要

The hydrothermal signatures of mid-ocean ridge sediments are crucial geochemical data providing insights into investigating hydrothermal anomalies and locating seafloor massive sulfide deposits. This paper outlines the geochemical features of 24 surface sediments and one sediment core (26V-GC01, 294 cm) along the South Mid-Atlantic Ridge (SMAR) from 18°S to 22°S, an area where hydrothermal active fields have yet to be discovered. The surface sediments mainly consist of biogenic carbonates, aluminosilicates, and hydrothermal Fe-Mn (oxy) oxides. The core sediments primarily comprise organic matter, detrital materials, hydrothermal components, and substances scavenged from seawater. The rare Earth element (REE) patterns suggest the presence of hydrothermal contributions within the surface and core sediments. The enrichment factors for Fe, Mn, Cu, and Zn in surface sediments suggest these metals are concentrated at the 19°S, 21°S, and 21.5°S segments, further indicating their potential as hydrothermal active fields. Downcore variations of Fe, Mn, P, Cu, Pb, V, and Co suggest at least six episodes of hydrothermal activity. The impact of hydrothermal processes on the sediments from SMAR 18°S to 22°S indicates that the study area has the potential to host a significant number of hydrothermal active fields.