A black shale protolith for gold-tellurium mineralisation in the Dalradian Supergroup (Neoproterozoic) of Britain and Ireland

Parnell, John; Perez, Magali; Armstrong, Joe; Bullock, Liam A.; Feldmann, Jörg; Boyce, Adrian J.

doi:10.1080/03717453.2017.1404682

Cited by 13 publications

(10 citation statements)

References 50 publications

(96 reference statements)

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“…As Pb and Se are concentrated in the rim it suggests that it was enriched at a later stage, after early stage pyritization mediated by sulphate-reducing bacteria. Similar features are described by Parnell et al (2017) and are attributed to hydrothermal Pb mineralisation during metamorphism. Fe and Cu are more evenly distributed throughout the burrow but are depleted at the burrow rim.…”

Section: Pyrite Mineralisationsupporting

confidence: 79%

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The sequestration of trace metals preserved in pyritized burrows

Brolly

Parnell

Wang

2021

Sedimentary Geology

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Section: Pyrite Mineralisationsupporting

confidence: 79%

“…Mm-scale burrows from each locality were analysed by laser ablation-inductively coupled plasmamass spectrometry (LA-ICP-MS) to produce enrichment maps. The LA-ICP-MS method is described in detail in Parnell et al (2017). This approach was used to map the distribution of Fe, Se, Cu and Pb.…”

Section: Methodsmentioning

confidence: 99%

The sequestration of trace metals preserved in pyritized burrows

Brolly

Parnell

Wang

2021

Sedimentary Geology

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“…Pyrite in the fresh shale from Edale village was analysed by laser ablation (LA)-ICP-MS. Details of the ICP-MS and LA-ICP-MS techniques have been given by Parnell et al (2017). Water was sampled from three sites in the spring and stream system (Fig.…”

Section: Methodsmentioning

confidence: 99%

Liberation of selenium from alteration of the Bowland Shale Formation: evidence from the Mam Tor landslide

Parnell

Bullock

Armstrong

et al. 2018

QJEGH

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The Bowland Shale Formation is anomalously rich in selenium (Se) at levels an order of magnitude greater than other black shales. The Mam Tor landslide, Derbyshire, England, offers an opportunity to measure whether the Se anomaly is conferred to the alteration products formed by oxidative water flow through the shale. Selenium in the shale is concentrated in diagenetic pyrite. Alteration of the shale causes decomposition of the pyrite to iron oxyhydroxide, which is carried in colloidal form (ochre) by springs draining the landslide. The iron oxyhydroxide contains anomalously high Se, and anomalously high Se was measured in water ponded where the ochre precipitated, although not in flowing groundwater. Other trace elements including cadmium and thallium also occur at concentrations higher than in other ochres. Given the widespread nature of the Se anomaly in the Bowland Shale Formation and equivalents across Britain and Ireland, any alteration products derived from workings through the shale should be disposed of with care.

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“…Other negative and positive values within the δ 34 S range (−24.6‰ to +6.2‰) in this study, probably attribute pyrite formation to microbial sulfate reduction pointing to biogenic activity. Recent research work conducted on the Dalradian Supergroup Neoproterozoic of Britain and Ireland returned sulfur isotope values of −31.6‰, +17.1‰ and −4.6‰ interpreted that sulfur derived from sea water sulfate reduction [68].…”

Section: Sulfur and Carbon Isotope Compositionsmentioning

confidence: 99%

Geochemistry of Pyritic Mudstones from the Singa Formation, Malaysia: Insights into Gold Potential, Source of Sulfur and Organic Matter

et al. 2021

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Major trace element analyses, including pyrite chemistry of pyritic mudstones of shallow-marine Singa Formation of Pennsylvanian–Early Permian age have been carried out to assess gold potential, the source of sulfur and organic matter. Regionally, Singa Formation spatially correlates with the Bohorok Formation (Sumatra, Indonesia), the Kaeng Krachang group (Thailand), and the Lebyin group (Burma or Myanmar). In Southeast Asia, this formation is important because it has a record of glacial processes that occurred along the northern margin of Gondwana in the Late Paleozoic age. This study has revealed that mudstones of the Singa Formation, which contain lonestones of glacial origin, deposited under suboxic–oxic conditions in shallow marine environment during Pennsylvanian–Early Permian time. The black mudstones contain total organic carbon which ranges from 0.1 to 0.7 wt.%, and gold content varying from 40 to 62 ppb, making them gold source rocks. This study has revealed diagenetic gold presence in the early pyrite generations (pyrites 1, 2, and 3) in these mudstones with gold content ranging up to 1.6 ppm Au which is indicative of early enrichment of gold. Conversely, late generations of pyrite (pyrites 4, 5, and 6) in these mudstones record low gold content up to 0.5 ppm Au. The δ34S values for pyrite grains range from −24.6‰ to + 6.2‰ likely indicate a combination of magmatic and biogenic source of sulfur. Organic carbon isotope composition of the pebbly mudstone samples shows a wide range from −23.9‰ to −5.8‰ indicating a mixed terrestrial and marine source.

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A black shale protolith for gold-tellurium mineralisation in the Dalradian Supergroup (Neoproterozoic) of Britain and Ireland

Cited by 13 publications

References 50 publications

The sequestration of trace metals preserved in pyritized burrows

The sequestration of trace metals preserved in pyritized burrows

Liberation of selenium from alteration of the Bowland Shale Formation: evidence from the Mam Tor landslide

Geochemistry of Pyritic Mudstones from the Singa Formation, Malaysia: Insights into Gold Potential, Source of Sulfur and Organic Matter

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