Geochemistry of trace and rare earth elements during weathering of black shale profiles in Northeast Chongqing, Southwestern China: Their mobilization, redistribution, and fractionation

Ling, Sixiang; Wu, Xiyong; Ren, Yong; Sun, Chunwei; Liao, Xin; Li, Xiaoning; Zhu, Baolong

doi:10.1016/j.chemer.2015.07.004

Cited by 47 publications

(14 citation statements)

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“…2, Table SI1), however, when virtually normalised to the OM-, pyrite-, and carbonate-free mass, the concentrations remained relatively constant along the weathering transect in both shales (cf. Ling et al, 2015;Marynowski et al, 2017). Due to euxinic depositional conditions in a highly restricted basin with elevated productivity (Marynowski et al, 2012), concentrations of certain transition metals were up to several orders of magnitude higher in the Hangenberg shale than in the Tournaisian bed.…”

Section: Resultsmentioning

confidence: 99%

“…Derkowski and Marynowski, 2016). The remobilised elements are commonly enriched in the regolith or soil zones overlying the weathered shale (e.g., Ling et al, 2015); the mechanism by which redox-sensitive metals are bound by terrigenous and marine sediments has been extensively documented. This binding occurs in oxygenated soils, usually in humic acids, via phenolic and carboxyl functional groups (Senesi and Calderoni, 1988;Benedetti et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

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Binding of heavy metals by oxidised kerogen in (palaeo)weathered black shales

Derkowski

Marynowski

2018

Chemical Geology

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Citation style: Derkowski Arkadiusz, Marynowski Leszek. (2018). Binding of heavy metals by oxidised kerogen in (palaeo)weathered black shales. A B S T R A C TSub-aerial weathering of black shales drives the gradual leaching of sulphur-and organic-bound heavy metal elements, which are usually abundant in these rocks due to depositional conditions. The formation of oxygen functional groups in kerogen, however, can lead to an opposing mechanism -metal adsorption and binding, similar to a process common in soils. An increase in cation exchange capacity (CEC) measured previously using metal complexes on black shales oxidised under laboratory conditions implies that the same phenomenon may occur in a naturally oxidised black shale. This idea was tested on a unique, well-developed and -preserved Permian palaeoweathering profile containing two neighbouring but diverse black shales from the Devonian/ Carboniferous boundary in the Holy Cross Mountains (Poland).In the studied black shale beds, the oxygen groups formed in kerogen in the partially-weathered zone were found to be responsible for significant changes in adsorption properties measured using hexamminecobalt(III) and Cu(II)-triethylenetetramine cations, which are common probes for CEC. Compared to a pristine part of black shales, the partially weathered zone was depleted of total organic carbon (TOC), sulphur, and sulphur-and organic-bound metals, and highly enriched in Cu, which is generally present in low levels in the nascent shales.In the partially weathered zone, where TOC content is reduced, apparent CEC values surpass the CECs predicted from the contents and structures of clay minerals, and correlate linearly with the content of oxygen groups developed during weathering. The adsorption properties of carboxyl groups in the oxidised kerogen are suggested as being responsible for the syn-or post-weathering enrichment in Cu caused by the remobilisation of older Cu-sulphide ores present in the area. As opposed to natural weathering, aggressive oxidation, e.g. under laboratory conditions produces a high proportion of cross-linked oxygen groups that do not participate in metal cation adsorption. The CEC values of artificially oxidised samples reached a limit corresponding to those of naturally oxidised shales.Editor: Michael E. Böttcher exchange capacity (CEC) of soils (Parfitt et al., 1995;Kaiser et al., 2008;Rengasamy and Churchman, 1999) and oxidised low-rank coals (Skodras et al., 2014). In extreme cases, it is the oxidised black carbon formed via incomplete combustion of vegetation or fossil fuels that is responsible for high CEC levels in soils (Liang et al., 2006;Cheng et al., https://doi.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Binding of heavy metals by oxidised kerogen in (palaeo)weathered black shales

Derkowski

Marynowski

2018

Chemical Geology

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“…that not locked into primary silicates or resistates) can be washed down the profile by (acidic) precipitation (e.g. Ling et al, 2015; Mina rik, Zigov a, Bendl, Sk rivan, & St'astn y, 1998; Nesbitt, 1979). REEs have been found to adsorb readily on clay minerals, organic matter and metal oxyhydroxides in soil profiles (e.g.…”

Section: Resultsmentioning

confidence: 99%

Recognition of geochemical footprints of mineral systems in the regolith at regional to continental scales

Caritat

Main

Grunsky

et al. 2016

Australian Journal of Earth Sciences

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Understanding the character of Australia's extensive regolith cover is crucial to the continuing success of mineral exploration. We hypothesise that the regolith contains geochemical fingerprints of processes related to the development and preservation of mineral systems at a range of scales. We test this hypothesis by analysing the composition of surface sediments within greenfield regionalscale (southern Thomson Orogen) and continental-scale (Australia) study areas. In the southern Thomson Orogen area, the first principal component (PC1) derived in our study [Ca, Sr, Cu, Mg, Au and Mo at one end; rare earth elements (REEs) and Th at the other] is very similar to the empirical vector used by a local company (enrichment in Sr, Ca and Au concomitant with depletion in REEs) to successfully site exploration drill holes for Cu-Au mineralisation. Mapping of the spatial distribution of PC1 in the region reveals several areas of elevated values and possible mineralisation potential. One of the strongest targets in the PC1 map is located between Brewarrina and Bourke in northern New South Wales. Here, exploration drilling has intersected porphyry Cu-Au mineralisation with up to 1 wt% Cu, 0.1 g/t Au, and 717 ppm Zn. The analysis of a comparable geochemical dataset at the continental scale yields a compositionally similar PC1 (Ca, Sr, Mg, Cu, Au and Mo at one end; REEs and Th at the other) to that of the regional study. Mapping PC1 at the continental scale shows patterns that (1) are spatially compatible with the regional study and (2) reveal several geological regions of elevated values, possibly suggesting an enhanced potential for porphyry Cu-Au mineralisation. These include well-endowed mineral provinces such as the Curnamona and Capricorn regions, but also some greenfield regions such as the Albany-Fraser/western Eucla, western Murray and Eromanga geological regions. We conclude that the geochemical composition of Australia's regolith may hold critical information pertaining to mineralisation within/beneath it.

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“…The analytical results of rare earth elements (REE) of laminated algal micritic dolomite in Jixian System show that ( (He et al, 2014;Ling et al, 2015;Shao, Lu, Li, & Meng, 2015;Xiong et al, 2014).…”

Section: Element Geochemistrymentioning

confidence: 99%

Influence on the oil‐gas accumulation potential of the laminated algal micritic dolomite in Jixian system from Mesozoic magmatic activities at the south‐western margin of the Ordos Basin, China

Liu

Zhao

et al. 2017

Geological Journal

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The Mesoproterozoic Jixian System is widely distributed at the south‐western margin of the Ordos Basin. It is mainly dominated by siliceous laminated algal micritic dolomite that is a set of potential carbonate source rocks. The magmatic activities at the south‐western margin of the Ordos Basin were frequent and intensive, and the Tongcheng intrusion exposed in this area has an intrusive contact relationship with the Jixian System. This paper uses geochemical methods to study the influence of magmatism to lithology, physical properties, hydrocarbon generating property, and geochemistry of the Jixian System. Analysis data reveal that, with the increasing distance to the intrusion, the porosity, permeability, and content of dolomite, trace elements, and rare earth elements in surrounding rock decrease while the density and silica content increase gradually. In addition, the parameters have a weakening trend about adsorbed hydrocarbon (S1), pyrolysis hydrocarbon (S2), hydrocarbon generating potential (S1 + S2), and pyrolysis peak temperature (Tmax). The results suggest that the magmatic hydrothermalism and the thermal effect of magmatic intrusion changed the physical and geochemical characteristics of the surrounding rock and promoted the hydrocarbon generation of organic matter. However, these characteristics reflect that the magmatic activities only have a relatively small effect on the laminated algal micritic dolomite in Jixian System without a destructive effect at the south‐western margin of the Ordos Basin. The petroleum potential of the Jixian System is worthy to be further explored.

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Geochemistry of trace and rare earth elements during weathering of black shale profiles in Northeast Chongqing, Southwestern China: Their mobilization, redistribution, and fractionation

Cited by 47 publications

References 76 publications

Binding of heavy metals by oxidised kerogen in (palaeo)weathered black shales

Binding of heavy metals by oxidised kerogen in (palaeo)weathered black shales

Recognition of geochemical footprints of mineral systems in the regolith at regional to continental scales

Influence on the oil‐gas accumulation potential of the laminated algal micritic dolomite in Jixian system from Mesozoic magmatic activities at the south‐western margin of the Ordos Basin, China

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