Digestion methods for trace element measurements in shales: Paleoredox proxies examined

Xu, Guangping; Hannah, Judith L.; Bingen, Bernard; Georgiev, Svetoslav; Stein, Holly J.

doi:10.1016/j.chemgeo.2012.01.029

Cited by 61 publications

(43 citation statements)

References 56 publications

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“…The high concentration of Co and the higher than average value of Mo in these sediments point toward periodical input of freshwater into the Weald Basin (e.g. G. Xu et al ., 2012; L.…”

Section: Discussionsupporting

confidence: 90%

Multi‐proxy approach to palaeoenvironmental modelling: the English Lower Cretaceous Weald Basin

Akinlotan

2017

Geological Journal

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Palaeoenvironmental reconstructions of the Wealden (Lower Cretaceous) in southeast England have been previously based mainly on field and fossil data. This study presents new interpretations of multi-proxy data sets such as sandstone petrography, elemental geochemistry and sideritic ironstones, supplemented by outcrop and clay mineralogical data. The dominance of quartz arenites, kaolinite and thorium and the presence of Zr in the sediments suggest that they were sourced mainly from granitic and/or gneissic rocks. Materials from metamorphic sources are secondary in abundance. The mineral and textural maturity of the sediments coupled with inferred short transport distances suggests reworking from older sources. Palaeoclimatic conditions in the source areas were generally warm and humid in nature, which supported an intensive weathering regime. The nature of the sediments suggests they may have been sourced directly or indirectly from a stable craton. The lithology, facies, sedimentary structures, architecture and gamma ray data confirm the freshwater origin of the sediments. Redox-sensitive trace elements such as Mo, U, V and Co suggest anoxic conditions in the basin. The results presented in this paper reinforce the importance of integrating multi-proxy data sets for interpreting the palaeoenvironmental conditions of sedimentary basins: when traditional data sets such as field and fossil data are not readily available or insufficient to enable adequate interpretations, the integration of petrographic, mineralogical and geochemical data sets may prove to be useful in similar palaeoenvironmental studies.

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“…The high concentration of Co and the higher than average value of Mo in these sediments point toward periodical input of freshwater into the Weald Basin (e.g. G. Xu et al ., 2012; L.…”

Section: Discussionsupporting

confidence: 90%

Multi‐proxy approach to palaeoenvironmental modelling: the English Lower Cretaceous Weald Basin

Akinlotan

2017

Geological Journal

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“…This method represents a partial leach of the rock, with digestion of all phases except silicates. Aqua regia digestion is considered to best represent the seawater depositional component of black shales (Xu, Hannah, Bingen, Georgiev, & Stein, ).…”

Section: Methodsmentioning

confidence: 99%

Tellurium, selenium and cobalt enrichment in Neoproterozoic black shales, Gwna Group, UK: Deep marine trace element enrichment during the Second Great Oxygenation Event

et al. 2018

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Black shales of the late Neoproterozoic Gwna Group (570-580 Ma), UK, contain enrichments of tellurium (Te), selenium (Se) and cobalt (Co) relative to average shale compositions. The Te and Co enrichments bear comparison with those of ferromanganese crusts in the modern deep ocean. Gwna Group deposition coincides with the Second Great Oxidation Event, which had a significant effect on trace element fixation globally. Selenium and Te concentrations within these black shales indicate increased continental weathering rates, high biological productivity and corresponding increases in atmospheric O 2 concentrations. Cobalt, nickel (Ni) and arsenic (As) enrichments in this succession are secondary mineralisation phases. Demand for many of the trace elements found enriched in the Gwna Group black shales make their mechanisms of accumulation, and variations through the geological record, important to understand, and suggests that new resources may be sought based on black shale protoliths from this period.

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“…Molybdenum, however, is only enriched in sediments in the presence of free H 2 S (i.e., euxinic conditions). Therefore, high V/Mo ratios with low Mo concentrations indicate suboxic or anoxic settings whereas concurrent enrichment of V and Mo (i.e., low V/Mo ratios and high Mo contents) indicate euxinic conditions (e.g., Xu et al, 2012).…”

Section: Re-os Geochronology To Establish Correlations Between Geogramentioning

confidence: 99%

Earthquakes in Longmenshan and Hydrocarbon Accumulation in Western Sichuan

Cao

Liu

2013

Acta Geologica Sinica (Eng)

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Digestion methods for trace element measurements in shales: Paleoredox proxies examined

Cited by 61 publications

References 56 publications

Multi‐proxy approach to palaeoenvironmental modelling: the English Lower Cretaceous Weald Basin

Multi‐proxy approach to palaeoenvironmental modelling: the English Lower Cretaceous Weald Basin

Tellurium, selenium and cobalt enrichment in Neoproterozoic black shales, Gwna Group, UK: Deep marine trace element enrichment during the Second Great Oxygenation Event

Earthquakes in Longmenshan and Hydrocarbon Accumulation in Western Sichuan

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