Ultramafic-derived arsenic in a fractured bedrock aquifer

Ryan, Peter C.; Kim, Jonathan; Wall, A. J.; Moen, Jonathan C.; Corenthal, Lilly; Chow, Daniel R.; Sullivan, Colleen M.; Bright, Kevin S.

doi:10.1016/j.apgeochem.2011.01.004

Cited by 36 publications

(20 citation statements)

References 46 publications

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“…In Maine and New Hampshire, USA, pegmatites, granites and metamorphic rocks (granofels) were found to have substantial As contents up to 60, 46 and 39 mg/kg, respectively (Peters et al 1999;Peters 2008). Fractured ultramafic rocks in Vermont, USA, contribute up to 327 μg/L of As to groundwater although mafic rocks contain much lower As (Ryan et al 2011). As in hot springs from geothermal fields in New Zealand is found at concentrations that range to 4,800 μg/L and Acidic (pH 1.2) geothermal springs in Japan contained As at 2,600 μg/L (Noguchi and Nakagawa 1969).…”

Section: Volcanic Rocks Geothermal Activitymentioning

confidence: 98%

Arsenic and Fluoride Pollution in Water and Soils

Farooqi

2015

Arsenic and Fluoride Contamination

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Section: Volcanic Rocks Geothermal Activitymentioning

confidence: 98%

Arsenic and Fluoride Pollution in Water and Soils

Farooqi

2015

Arsenic and Fluoride Contamination

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“…Charnock et al (2007) also found that arsenic was incorporated into garnet in the overgrowth of a hydrothermal vein, and Pascua et al (2005) found arsenic-enriched smectite in hydrothermal precipitates at a geothermal plant in Akita, Japan. In addition, Ryan et al (2011) reported that groundwater in the fracture zone of ultramafic rocks was contaminated with arsenic derived from serpentine and magnesite via chemical weathering. McDonough and Sun (1995) estimated the arsenic concentration of Earth's primitive mantle to be 0.05 mg/kg.…”

Section: Geologic Cycling Of Arsenicmentioning

confidence: 99%

Arsenic cycling in the Earth’s crust and hydrosphere: interaction between naturally occurring arsenic and human activities

Masuda

2018

Prog Earth Planet Sci

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Field-based research on naturally occurring arsenic contamination of surface waters and groundwaters and the mechanisms of contamination are reviewed. The distribution of arsenic is strongly related to areas of active plate tectonics, magmatism and associated hydrothermal activity, and high rates of erosion. Sources of arsenic contamination are mainly hydrothermal water, sulfide and arsenide minerals, volcanic ash, and iron oxyhydroxide/oxide as weathering products. The promotion of the reduction and oxidation of arsenic source minerals by in situ microbial activity is an important secondary mechanism that often determines arsenic levels in groundwater. Anthropogenic activities, such as geothermal and mining operations, as well as excess pumping of shallow groundwaters, disperse arsenic in the environment, thereby expanding areas of arsenic contamination.

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“…Some of these Devonian aquifers are fractured enough to have developed some permeability, however, this is not to an extent to be classified as regionally important aquifers (Pracht, 1997). Recent research has demonstrated that fractured bedrock aquifers give rise to elevated concentrations of arsenic (Bondu et al, 2016) and other trace metals in groundwaters in the US, Canada, Africa, France, Italy, Greece, and certain regions in Asia (Ayotte et al, 2003(Ayotte et al, , 2006Smedley et al, 2007;Verplanck et al, 2008;Ryan et al, 2011Ryan et al, , 2015Drummer et al, 2015;Reyes et al, 2015;Zkeri et al, 2015;Andy et al, 2017). In Ireland, these hard rock aquifers, or poorly productive aquifers (PPA) underlie 60% of the country (Robins and Misstear, 2000) and provide an important water source for farms, houses, small housing estates, hotels, and small businesses.…”

Section: Aquifer Classificationmentioning

confidence: 99%

Arsenic in Groundwater in South West Ireland: Occurrence, Controls, and Hydrochemistry

McGrory

Alvarez‐Iglesias

Bargary

et al. 2018

Front. Environ. Sci.

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Globally numerous regions have been identified with elevated arsenic within groundwater which can result in potential adverse health risks. In Ireland, a previous national-scale research assessment of groundwater identified isolated clusters of elevated arsenic and indicated that lithology was a major controlling factor on arsenic in groundwater. Complementary comparisons of national-scale and regional-scale groundwater assessments of arsenic are lacking in Europe when compared to other global regions. The aims of this study were to demonstrate the value of a regional-scale groundwater hydrochemistry dataset with an existing national-scale approach, describe anomalies that can become the focus of attention for public health and economic reasons, and to provide a wider context for arsenic in groundwater within Ireland and Europe. Regional-scale data using 470 locations comprising 1,493 analyses using several hydrochemical parameters (arsenic, pH, conductivity, iron, manganese, sodium, potassium, calcium, magnesium, and total hardness) in south west Ireland were integrated with geological, hydrogeological, and land use datasets. Statistical analysis was performed using a combination of methods including score tests of geological groups using an empirical cumulative distribution function plot in addition to spatial analysis. Results revealed that hydrochemical parameters exhibited different spatial clusters, which was generally associated with lithology. Arsenic was elevated in sandstone derived bedrock. Weak correlation of arsenic with other hydrochemical parameters were observed and redox-sensitive elements like manganese and iron showed a greater diversity in spatial occurrence. This study has shown that the variation of hydrochemical parameters are controlled by regional geology. Finally, the paper focuses on anomalies identified by concentrations of individual ions or statistical associations in the context of, for example, historical mineral exploration and mining in the area and also discusses whether groundwater chemistry sampling on this scale can assist in future mineral exploration, as well as guiding the future development of high quality public and private water supplies.

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Ultramafic-derived arsenic in a fractured bedrock aquifer

Cited by 36 publications

References 46 publications

Arsenic and Fluoride Pollution in Water and Soils

Arsenic and Fluoride Pollution in Water and Soils

Arsenic cycling in the Earth’s crust and hydrosphere: interaction between naturally occurring arsenic and human activities

Arsenic in Groundwater in South West Ireland: Occurrence, Controls, and Hydrochemistry

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