The Mineralogical Characteristics of Pyrite at 26°S Hydrothermal Field, South Mid‐Atlantic Ridge

Li, Tao; Yang, Yi‐Chun; Wang, Guozhi; Fan, Lei; Wang, Cheng; Li, Bing

doi:10.1111/1755-6724.12369_18

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…In the low-elevation fields, fresh basalt is partially covered by loose sediments, whereas no ultramafic rocks are exposed [28]. Abundant metallic sulfide fragments, vent biota, chimney fragments, and inactive chimneys on slopes and low-lying fields were observed by camera tow surveys [40]. The detected temperature anomalies, presence of methane (CH4), and widespread turbidity anomalies highlight the existence of hydrothermal vents in the Xunmei HF.…”

Section: Geological Settingmentioning

confidence: 92%

Geochemical Characteristics of Seabed Sediments in the Xunmei Hydrothermal Field (26°S), Mid-Atlantic Ridge: Implications for Hydrothermal Activity

Yang,

Li,

Dang

et al. 2024

Minerals

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The compositions of metalliferous sediments associated with hydrothermal vents can provide key geochemical data for locating seafloor sulfides. In this study, we present the geochemistry of seabed sediments from the Xunmei hydrothermal field (HF) in the South Mid-Atlantic Ridge (SMAR). The results indicate that the sediments are mainly composed of pelagic material (biogenic calcium components), basaltic debris, iron-manganese oxides, and hydrothermal components. The sediments are significantly enriched in Cu, Zn, Fe, and Co deriving from hydrothermal fluids, as well as Mn, V, Mo, U, and P, which are primarily scavenged from seawater. The northeastern Xunmei has the highest concentrations of Cu and Zn, while the northeastern, northern, and southern regions are characterized by great inputs of Fe. Manganese and Mo are mainly enriched in the western and southern parts and show a strong positive correlation, indicating that Mo is mainly scavenged by Mn oxides. Uranium, P, and Fe exhibit strong positive correlations, suggesting that they coprecipitate with Fe from hydrothermal plumes. Vanadium and Co are introduced into sediments in different ways: V is scavenged and coprecipitated by hydrothermal plumes, and Co is derived from sulfide debris. Based on the contents of Cu and Zn and Cu/Fe (0.159), Zn/Fe (0.158), and Fe/Mn (1440) ratios, it can be inferred that a high-temperature hydrothermal vent existed in northeastern Xunmei. In combination with the distribution patterns of the above elements, the hydrothermal vents in the southern part ceased erupting after a short period of activity. In addition, the high Mn anomaly and the high U/Fe ratios at the boundaries of the investigated area indicate the presence of a relatively oxidized environment in southwestern Xunmei.

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Section: Geological Settingmentioning

confidence: 92%

Geochemical Characteristics of Seabed Sediments in the Xunmei Hydrothermal Field (26°S), Mid-Atlantic Ridge: Implications for Hydrothermal Activity

Yang,

Li,

Dang

et al. 2024

Minerals

Self Cite

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show abstract

“…In the low-elevation fields, fresh basalt is partially covered by loose sediment, and no ultramafic rocks are exposed [30]. Abundant metallic sulfide fragments, vent biota, chimney fragments, and inactive chimneys on slopes and low-lying fields were observed by camera tow surveys [2]. The detected temperature anomalies, presence of methane (CH4), and widespread turbidity anomalies highlight the existence of hydrothermal vents in the Xunmei HF.…”

Section: Introductionmentioning

confidence: 94%

“…Seafloor hydrothermal activities involve the exchange of materials and heat across multiple spheres, including the lithosphere, hydrosphere, and biosphere. These activities are accompanied by alteration of basement rocks and the precipitation of polymetallic sulfides and metalliferous sediments [2]. These products serve as evidence of seafloor hydrothermal circulation and provide a window to explore the formation and fluid evolution of seafloor hydrothermal systems 2 [3].…”

Section: Introductionmentioning

confidence: 99%

Geochemical Characteristics of Surface Sediments in the Xunmei Hydrothermal Field (26°S), Mid-Atlantic Ridge: Implications for Hydrothermal Activity

Yang,

Li,

Dang

et al. 2023

Preprint

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The compositions of metalliferous sediments which is associated with hydrothermal vents can provide reliable geochemical indicators for the exploration of seafloor sulfides. In this study, surface sediments from the Xunmei hydrothermal field (HF) on the South Mid-Atlantic Ridge (SMAR) were selected, and their major and trace elements were analysed. The results showed that the sediments are composed of pelagic material (calcium biogenic components), basaltic debris, iron-manganese oxides, and a mixture of hydrothermal components. Additionally, the sediments were found to be significantly enriched in Cu, Zn, Fe and Co derived from hydrothermal sources, as well as Mn, V, Mo, U and P, which are primarily scavenged from seawater. The Cu and Zn concentrations are highest in the northeastern part of Xunmei, while the northeastern, northern, and southern parts are characterized by great inputs of hydrothermal Fe. Manganese and Mo are mainly enriched in the western and southern parts and show a strong positive correlation, indicating that Mo is mainly scavenged by Mn oxides. There are high positive correlations among U, P, and Fe, indicating their coprecipitation with Fe from hydrothermal plumes. Vanadium and Co are introduced into sediments in two ways, i.e., V is scavenged and coprecipitates from hydrothermal plumes, and Co is derived from sulfide debris. Based on the variations in Cu and Zn contents and in the Cu/Fe (0.159), Zn/Fe (0.158), and Fe/Mn (1440) ratios, it can be inferred that a high-temperature hydrothermal vent existed in northeastern Xunmei. In combination with the distribution patterns of the above elements, the hydrothermal vents in the southern part ceased erupting after a short period of activity. In addition, the high Mn anomaly and the high U/Fe ratios at the boundaries of the investigated area indicate the presence of a relatively oxidized environment in southwestern Xunmei.

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Mineralogy and geochemistry of secondary minerals and oxyhydroxides from the Xunmei hydrothermal field, Southern Mid-Atlantic Ridge (26°S): Insights for metal mobilization during the oxidation of submarine sulfides

Meng

Jin

et al. 2021

Marine Geology

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The Mineralogical Characteristics of Pyrite at 26°S Hydrothermal Field, South Mid‐Atlantic Ridge

Cited by 4 publications

References 2 publications

Geochemical Characteristics of Seabed Sediments in the Xunmei Hydrothermal Field (26°S), Mid-Atlantic Ridge: Implications for Hydrothermal Activity

Geochemical Characteristics of Seabed Sediments in the Xunmei Hydrothermal Field (26°S), Mid-Atlantic Ridge: Implications for Hydrothermal Activity

Geochemical Characteristics of Surface Sediments in the Xunmei Hydrothermal Field (26°S), Mid-Atlantic Ridge: Implications for Hydrothermal Activity

Mineralogy and geochemistry of secondary minerals and oxyhydroxides from the Xunmei hydrothermal field, Southern Mid-Atlantic Ridge (26°S): Insights for metal mobilization during the oxidation of submarine sulfides

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