Contaminants from Cretaceous black shale: I. Natural weathering processes controlling contaminant cycling in Mancos Shale, southwestern United States, with emphasis on salinity and selenium

Tuttle, Michele L.; Fahy, Juli W.; Elliott, John G.; Grauch, Richard I.; Stillings, Lisa L.

doi:10.1016/j.apgeochem.2013.12.010

Cited by 61 publications

(29 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Water samples were promptly filtered and analyzed for standard cations, anions, silica, and selected metals including strontium, iron, aluminum, manganese, and selenium. Metals were chosen to assist in the delineation of flow paths through the underlying Mesozoic sedimentary units since the Mancos Shale is a known source of selenium [ Mast et al , ; Tuttle et al , , ].…”

Section: Site Description and Methodsmentioning

confidence: 99%

Is there a geomorphic expression of interbasin groundwater flow in watersheds? Interactions between interbasin groundwater flow, springs, streams, and geomorphology

Frisbee

Tysor

Stewart-Maddox

et al. 2016

Geophysical Research Letters

View full text Add to dashboard Cite

Interbasin groundwater flow (IGF) can play a significant role in the generation and geochemical evolution of streamflow. However, it is exceedingly difficult to identify IGF and to determine the location and quantity of water that is exchanged between watersheds. How does IGF affect landscape/watershed geomorphic evolution? Can geomorphic metrics be used to identify the presence of IGF? We examine these questions in two adjacent sedimentary watersheds in northern New Mexico using a combination of geomorphic/landscape metrics, springflow residence times, and spatial geochemical patterns. IGF is expressed geomorphically in the landscape placement of springs and flow direction and shape of stream channels. Springs emerge preferentially on one side of stream valleys where landscape incision has intercepted IGF flow paths. Stream channels grow toward the IGF source and show little bifurcation. In addition, radiocarbon residence times of springs decrease and the geochemical composition of springs changes as the connection to IGF is lost.

show abstract

Section: Site Description and Methodsmentioning

confidence: 99%

Is there a geomorphic expression of interbasin groundwater flow in watersheds? Interactions between interbasin groundwater flow, springs, streams, and geomorphology

Frisbee

Tysor

Stewart-Maddox

et al. 2016

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…In addition, pyrite in shale is very sensitive to oxidation. When shale is exposed to surface, the pyrite contents in shale reduce very fast, even precede organic matter loss (Tuttle, Fahy, Elliott, Grauch, & Stillings, ; Wildman et al, ). At the same time, the hydrogen ions can be formed, and some trace elements can be released, the latter may have adverse impacts on environment and humans (Evangelou & Zhang, ; Rimstidt & Vaughan, ).…”

Section: Resultsmentioning

confidence: 99%

Mineralogy and geochemical investigation of Cambrian and Ordovician–Silurian shales in South China: Implication for potential environment pollutions

et al. 2019

View full text Add to dashboard Cite

Rapid expansion of shale gas development in China raises environmental and human health concerns. Several studies present related information on these concerns in the United States and Canada, yet they are few in China at present. This paper presents a series of original and published mineralogical and trace elements data from two gas shales (Niutitang shale and Longmaxi shale) considered as producing gas shale in China. Mineralogical and geochemical data surveyed can be applied to evaluate the potential environment pollutions during shale weathering and hydraulic fracturing. After compilations of the mineralogical and trace elements data, we can conclude that (a) there is generally more pyrite compared with carbonate for Niutitang shales, indicating that Niutitang shales are more prone to generate the hydrogen ions than Longmaxi shales; (b) many of the environmental hazardous trace elements considered here show an association with organic matter and/or pyrite, indicating that these trace elements are prone to mobilize and release during shale weathering and hydraulic fracturing; (c) some environmental hazardous elements like As, Ni, and Ba that have extremely high concentrations in some regions as compared with the screening limits for soil and drinking water should attract more attention; and (d) clay-rich shale with abundant organic matter may be the most favourable shale gas reservoir for the Niutitang shale, especially for those shales in Lower Yangtze region. Moreover, more mineralogical and geochemical data will be required for a comprehensive environmental impacts assessment. KEYWORDS environmental and human impacts, mineralogy, pyrite oxidization, shale, South China, trace elements

show abstract

“…However, the Mancos Shale is found along the perimeter of Narraguinnep Reservoir and in upstream basins and is also a potential source of considerable V and Co to the reservoir. Samples of Mancos Shale were reported to contain V that averaged about 155 lg/g (n = 10) and Co that averaged 8.1 lg/g (n = 10) (Tuttle et al, 2014), which are similar in concentration to Narraguinnep Reservoir bottom sediment (Table 1). It is likely that Narraguinnep Reservoir receives sediment from a combination of local and regional soil, bedrock, and airborne sources.…”

Section: Sedimentmentioning

confidence: 96%

Mercury deposition and methylmercury formation in Narraguinnep Reservoir, southwestern Colorado, USA

Gray

Hines

Goldstein

et al. 2014

Applied Geochemistry

View full text Add to dashboard Cite

Editorial handling by M. Kersten a b s t r a c t Narraguinnep Reservoir in southwestern Colorado is one of several water bodies in Colorado with a mercury (Hg) advisory as Hg in fish tissue exceed the 0.3 lg/g guideline to protect human health recommended by the State of Colorado. Concentrations of Hg and methyl-Hg were measured in reservoir bottom sediment and pore water extracted from this sediment. Rates of Hg methylation and methylHg demethylation were also measured in reservoir bottom sediment. The objective of this study was to evaluate potential sources of Hg in the region and evaluate the potential of reservoir sediment to generate methyl-Hg, a human neurotoxin and the dominant form of Hg in fish. Concentrations of Hg (ranged from 1.1 to 5.8 ng/L, n = 15) and methyl-Hg (ranged from 0.05 to 0.14 ng/L, n = 15) in pore water generally were highest at the sediment/water interface, and overall, Hg correlated with methyl-Hg in pore water (R 2 = 0.60, p = 0007, n = 15). Net Hg methylation flux in the top 3 cm of reservoir bottom sediment varied from 0.08 to 0.56 ng/m 2 /day (mean = 0.28 ng/m 2 /day, n = 5), which corresponded to an overall methyl-Hg production for the entire reservoir of 0.53 g/year. No significant point sources of Hg contamination are known to this reservoir or its supply waters, although several coal-fired power plants in the region emit Hg-bearing particulates. Narraguinnep Reservoir is located about 80 km downwind from two of the largest power plants, which together emit about 950 kg-Hg/year. Magnetic minerals separated from reservoir sediment contained spherical magnetite-bearing particles characteristic of coal-fired electric power plant fly ash. The presence of fly-ash magnetite in post-1970 sediment from Narraguinnep Reservoir indicates that the likely source of Hg to the catchment basin for this reservoir has been from airborne emissions from power plants, most of which began operation in the late-1960s and early 1970s in this region.Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/).

show abstract

Contaminants from Cretaceous black shale: I. Natural weathering processes controlling contaminant cycling in Mancos Shale, southwestern United States, with emphasis on salinity and selenium

Cited by 61 publications

References 41 publications

Is there a geomorphic expression of interbasin groundwater flow in watersheds? Interactions between interbasin groundwater flow, springs, streams, and geomorphology

Is there a geomorphic expression of interbasin groundwater flow in watersheds? Interactions between interbasin groundwater flow, springs, streams, and geomorphology

Mineralogy and geochemical investigation of Cambrian and Ordovician–Silurian shales in South China: Implication for potential environment pollutions

Mercury deposition and methylmercury formation in Narraguinnep Reservoir, southwestern Colorado, USA

Contact Info

Product

Resources

About