Concentrations and isotopic variability of mercury in sulfide minerals from the Jinding Zn-Pb deposit, Southwest China

Tang, Yue; Bi, Xian‐Wu; Yin, Runsheng; Feng, Xinbin; Hu, Ruizhong

doi:10.1016/j.oregeorev.2016.12.009

Cited by 26 publications

(3 citation statements)

References 75 publications

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“…During the formation of submarine hydrothermal fluids, the conductively heated seawater leaches, concentrates, and transports Hg from magmatic/mantle rocks. Previous studies showed that these hydrothermal processes including boiling of hydrothermal fluids, aqueous Hg(0) separation, and redox reactions could cause significant MDF. ,, Similarly, the deposition of sulfides from hydrothermal fluids was also suggested to induce significant MDF, enriching sulfides with lighter Hg isotopes. ,− However, significant MIF unlikely occurs in these processes. In general, the ranges of δ 202 Hg in sulfides from the Indian Ocean Ridge (−1.23 to −0.05‰ for SWIR and −1.17 to −0.34‰ for CIR; Table ) are >5 times smaller than those documented for subaerial hydrothermal systems (−3.69 to 2.10‰).…”

Section: Resultsmentioning

confidence: 99%

Mercury Isotopes in Deep-Sea Epibenthic Biota Suggest Limited Hg Transfer from Photosynthetic to Chemosynthetic Food Webs

Yuan

Liu

Chen

et al. 2023

Environ. Sci. Technol.

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Deep oceans receive mercury (Hg) from upper oceans, sediment diagenesis, and submarine volcanism; meanwhile, sinking particles shuttle Hg to marine sediments. Recent studies showed that Hg in the trench fauna mostly originated from monomethylmercury (MMHg) of the upper marine photosynthetic food webs. Yet, Hg sources in the deep-sea chemosynthetic food webs are still uncertain. Here, we report Hg concentrations and stable isotopic compositions of indigenous biota living at hydrothermal fields of the Indian Ocean Ridge and a cold seep of the South China Sea along with hydrothermal sulfide deposits. We find that Hg is highly enriched in hydrothermal sulfides, which correlated with varying Hg concentrations in inhabited biota. Both the hydrothermal and cold seep biota have small fractions (<10%) of Hg as MMHg and slightly positive Δ199Hg values. These Δ199Hg values are slightly higher than those in near-field sulfides but are 1 order of magnitude lower than the trench counterparts. We suggest that deep-sea chemosynthetic food webs mainly assimilate Hg from ambient seawater/sediments and hydrothermal fluids formed by percolated seawater through magmatic/mantle rocks. The MMHg transfer from photosynthetic to chemosynthetic food webs is likely limited. The contrasting Hg sources between chemosynthetic and trench food webs highlight Hg isotopes as promising tools to trace the deep-sea Hg biogeochemical cycle.

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Section: Resultsmentioning

confidence: 99%

Mercury Isotopes in Deep-Sea Epibenthic Biota Suggest Limited Hg Transfer from Photosynthetic to Chemosynthetic Food Webs

Yuan

Liu

Chen

et al. 2023

Environ. Sci. Technol.

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“…Previous studies have demonstrated that at high temperatures, limited changes in

\delta {}^{202}\text{Hg}

(within ±0.5‰) could occur during magmatic processes and geothermal leaching of Hg from source rocks (Bergquist & Blum, 2007; Sherman et al., 2009; Smith et al., 2008). Redox reactions, mineral precipitation and boiling of geothermal fluids, however, may cause a large variation of up to 5‰ in 2Hg

{\delta }^{20}

(Sherman et al., 2009; Smith et al., 2005, 2008; Tang et al., 2017; Zambardi et al., 2009). In two fossil geothermal systems in Nevada, USA, the large variation of

\delta {}^{202}\text{Hg}

(up to 5‰) was attributed to boiling of magmatic fluids and associated loss of isotopically lighter Hg(0) from the geothermal system (Smith et al., 2005).…”

Section: Discussionmentioning

confidence: 99%

Sources, Fates, and Geochemical Cycling of Mercury in Geothermal Fields: Insights From Mercury Isotopes

Pan,

Huang,

Feng

2024

Geophysical Research Letters

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Geothermal fields emit remarkable amounts of mercury (Hg) to the environment. To address the source, fate and geochemical cycling of Hg in geothermal fields, we investigated Hg concentrations and isotopic compositions of hot spring water and fumarole gases from Rehai and Dagejia in SW‐China. Elevated Hg concentrations in fumarole gases (10.0–167 ng m−3) and hot spring water (3.44–84.5 ng L−1) were observed, suggesting that both geothermal fields are of environmental concern. The variation in Δ199Hg (−0.06 to 0.23‰) and Δ200Hg (−0.09 to 0.19‰) in hot spring water supports Hg likely originating from endogenous volcanic degassing and/or rainwater. Negative and nearly zero Δ199Hg in fumarole gases (−0.32 to 0.03‰) supports volcanic degassing and background atmosphere origin. The ranges of δ202Hg in fumarole gases (−0.74 to 0.59‰) and hot spring water (−1.29 to 0.52‰) could reflect limited fluids boiling in geothermal fields. This study, thus, fills an important knowledge gap regarding Hg global cycling.

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“…Flint's 2014 water crisis exposed the population to elevated lead levels from aging pipes, leading to a public health emergency with neurological and developmental effects, particularly affecting children, emphasizing the importance of water quality management (Burns, 2024). Artisanal gold mining in Ailaoshan released mercury, contaminating soil and water and impacting fish, affecting communities dependent on fish consumption and highlighting challenges in managing pollution from small-scale mining (Tang, et al, 2017).…”

Section: Case Studiesmentioning

confidence: 99%

Heavy Metal Contamination in Urban Soils: Health Impacts on Humans and Plants: A Review

Monib,

Niazi,

Azizi

et al. 2024

ejtas

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This research looks at how the growth of cities and industries affects the levels of heavy metals in the soil, which can impact people's health. We find out where the pollution comes from, such as factories, car fumes, and improper waste disposal, by reviewing existing studies. We use different methods to test the soil for heavy metals and study how exposure to these metals in urban areas affects people's health. The evidence shows a connection between high levels of heavy metals in city soil and health problems like breathing issues, brain disorders, and overall toxicity in the body. We also explore how these metals get into the human body, highlighting the importance of understanding how they are available and the ways people are exposed. To deal with polluted city soils, we look at different ways to manage the soil and suggest sustainable methods to reduce heavy metal pollution. Our discoveries add to what we know about urban environmental health, emphasizing the need for actions to protect city residents. Ultimately, this study aims to give important information and insights to policymakers, city planners, and public health officials for managing and lessening the health risks linked to heavy metal contamination in urban soils.

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Concentrations and isotopic variability of mercury in sulfide minerals from the Jinding Zn-Pb deposit, Southwest China

Cited by 26 publications

References 75 publications

Mercury Isotopes in Deep-Sea Epibenthic Biota Suggest Limited Hg Transfer from Photosynthetic to Chemosynthetic Food Webs

Mercury Isotopes in Deep-Sea Epibenthic Biota Suggest Limited Hg Transfer from Photosynthetic to Chemosynthetic Food Webs

Sources, Fates, and Geochemical Cycling of Mercury in Geothermal Fields: Insights From Mercury Isotopes

Heavy Metal Contamination in Urban Soils: Health Impacts on Humans and Plants: A Review

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