Roscoelite associated with reduction spots in Devonian red beds, Gamrie Bay, Banffshire

Panhuys-Sigler, Michéle van; Trewin, Nigel H.; Still, John

doi:10.1144/sjg32020127

Cited by 10 publications

(5 citation statements)

References 17 publications

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“…In Scotland there are various exposures of red beds containing reduction spots: the Devonian of Banffshire (Van Panhuys-Sigler et al 1996) and Dingwall (Parnell 1985;Parnell & Eakin 1987), the Carboniferous of North Berwick (Hofmann 1993), the Triassic of Gruinard Bay (author's observation ;Evans 1982) and the Mesoproterozoic lower Torridonian rocks of NW Scotland (this paper).…”

Section: Introductionmentioning

confidence: 91%

Reduction spots in the Mesoproterozoic age: implications for life in the early terrestrial record

Spinks

Parnell

Bowden

2010

International Journal of Astrobiology

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Reduction spots are common within continental red beds in the geological record. The method of formation of reduction spots is a subject of debate, but they are thought to be the result of the reducing nature of microbial life present in the sediment during burial, which caused localized reduction in sediment that was otherwise oxidized during diagenesis. Reduction spots often have dark concretionary cores commonly enriched in elements such as vanadium and uranium. This enrichment is also believed to be associated with the microbial reduction of the sediment. Isotopic data from sulphides present in the cores of analogue Triassic reduction spots are consistent with a potential microbial formation mechanism.Here we report the presence of reduction spots with vanadium-rich mica (roscoelite) -enriched cores within a terrestrial red bed sequence of the Mesoproterozoic age. These findings may be a possible indicator of life within the terrestrial geological record during the Mesoproterozoic age, a time when such evidence is otherwise very rare. These findings suggest that life had not only colonized terrestrial environments during the Mesoproterozoic age, but had established a deep biosphere in the sediment.

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Section: Introductionmentioning

confidence: 91%

Reduction spots in the Mesoproterozoic age: implications for life in the early terrestrial record

Spinks

Parnell

Bowden

2010

International Journal of Astrobiology

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“…This suggests that roscoelite was formed by a complex reaction involving a change in the oxidation-reduction potential of the groundwater and the presence in the sandstone of sensitive associations of minerals containing vanadium-rich iron and titanium oxides. The reduction spots formed by diffusion as part of the same process [46]. The occurrence of roscoelite in depositional environment indicates input from hydrothermal fluids [15].…”

Section: Sem-eds Analysismentioning

confidence: 96%

A Comparison of Mineralogical and Thermal Storage Characteristics for Two Types of Stone Coal

Xie

et al. 2019

Minerals

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Understanding the mineralogical and chemical characteristics of stone coal is imperative for exploring the thermal storage characteristics of stone coal. Two types stone coal (SCwt and SChc) were sampled from the pond of a stone coal mine in Henan province (China), and the chemical composition, phase composition, and thermal behavior of the stone coal were investigated. Furthermore, the petrography of the stone coal was studied in detail. The mineral phases of the stone coal were quartz, kaolinite, roscoelite, and goethite, as distinguished by reflected light microscopy and further proven by scanning electron microscope-energy dispersive spectrometer (SEM-EDS). The thermal conductivity of SCwt was 0.19 W m−1 K−1, while that of SChc was 0.24 W m−1 K−1. Stearic acid (SA) was blended with SCwt and SChc to prepare SA/SCwt and SA/SChc composites via an impregnation method, respectively. The thermogravimetric (TG) curves show that the loading capacity of SChc, at 17.40%, is higher than that of SCwt (16.63%). The thermal energy storage capacities of SA/SCwt and SA/SChc composites were 29.21 J g−1 and 33.02 J g−1 according to a differential scanning calorimetry (DSC) analysis. Therefore, SChc is a potential candidate for thermal storage applications due to more obvious thermal storage characteristics, including higher thermal conductivity and loading capacity.

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“…With thermal maturation, the crystallinity of haematite increases [37], and the capacity to adsorb trace metals would decrease with recrystallization [38], although changes in surface area during alteration could complicate the effect on adsorption. The contrast with age may be more evident in the case of V, Se, and U because of very ready redox-controlled mobility [39,40], which is also evident in the predominance of these elements in diagenetic reduction spheroids [41,42]. On the other hand, vanadian haematite containing percent level V is identified in some ore deposits, so this can occur as a stable phase [43,44].…”

Section: Geofluidsmentioning

confidence: 99%

Metal Flux from Dissolution of Iron Oxide Grain Coatings in Sandstones

et al. 2021

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Iron oxide grain coatings in red sandstones contain trace metals that are released upon dissolution of the coatings. Analyses by ICP-MS following acid leaching of the grain coatings show that the dissolved metals can constitute an ore-forming fluid, as hypothesized in models for sandstone-hosted ore deposits. Median compositions of 37 samples, mostly of Triassic to Devonian age, from across Britain and Ireland are 6.3 ppm copper, 2.4 ppm cobalt, 10.1 ppm vanadium, and 0.3 ppm uranium. These contents at the basin scale are adequate to form the observed range of ore deposits in red beds. The migration of hydrocarbons or brines can cause the dissolution of grain coatings and contributes to controlling the distribution of ore deposits. Future measurements should test red beds derived from uplifted, mineralized plate margins, in which sandstones may be preloaded with ore metals.

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Roscoelite associated with reduction spots in Devonian red beds, Gamrie Bay, Banffshire

Cited by 10 publications

References 17 publications

Reduction spots in the Mesoproterozoic age: implications for life in the early terrestrial record

Reduction spots in the Mesoproterozoic age: implications for life in the early terrestrial record

A Comparison of Mineralogical and Thermal Storage Characteristics for Two Types of Stone Coal

Metal Flux from Dissolution of Iron Oxide Grain Coatings in Sandstones

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