Isotope geochemistry (S, C, O, Sr, Pb) of the Chaudfontaine mineralization (Belgium)

Dejonghe, Léon; Boulègue, Jacques; Demaiffe, Daniel; Lètolle, René

doi:10.1007/bf00206317

Cited by 18 publications

(7 citation statements)

References 17 publications

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“…So, the sulfur in the ore-forming fluids of this deposit mainly came from the carbonate strata of different ages and resulted from reduction of marine sulfates. This result is in agreement with the conclusion that the sulfur in the ore-forming fluids responsible for many Pb-Zn deposits enriched in heavy sulfur in the world was derived from marine sulfates (Dejonghe et al, 1989;Anderson et al, 1989Anderson et al, , 1998Ghazban et al, 1990;Hu et al, 1995;Liu Tiegeng and Ye Lin, 1995;Dixon and Davidson, 1996;Seal, 2006;Kamona and Friedrich, 2007;Zhang Huan et al, 2007;Basuki et al, 2008). There are three viewpoints concerning the reductive mechanism of evaporitic sulfates, namely, thermal degradation of organic matter, especially from ~100 to 150 , thermo ℃ -chemical sulfate reduction and bacterial sulfate reduction (Seal, 2006;Basuki et al, 2008).…”

Section: Discussionsupporting

confidence: 85%

“…So, the δ 34 S values of ore-forming fluids can be represented by those of sulfides (Ohmoto, 1972), i.e., δ 34 S ∑S ≈δ 34 S sulfide , especially, the δ 34 S values of pyrite can approximately represent those of ore-forming fluids. So we used the sulfur isotopes of pyrite as a tracer to constrain the origin of ore-forming fluids (Dejonghe et al, 1989;Dixon and Davidson, 1996;Seal, 2006;Basuki et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

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Sulfur isotopic composition of the Tianqiao Pb-Zn ore deposit, Northwest Guizhou Province, China: Implications for the source of sulfur in the ore-forming fluids

et al. 2010

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The Tianqiao Pb-Zn ore deposit of Guizhou Province, China, is located in the mid-east of the Sichuan-Yunnan-Guizhou Pb-Zn-Ag multi-metallic mineralization area, which is representative of the Pb-Zn ore deposits in this area. It consists of three main orebodies, whose Pb+Zn reserves are more than 0.2 million ton. This paper analyzes the sulfur isotopic composition of these orebodies. The data show that the ore minerals (galena, sphalerite, pyrite) in these orebodies are enriched in heavy sulfur, with δ 34 S V-CDT values varying between 8.35‰ and 14.44‰, i.e. the δ 34 S V-CDT values of pyrite are between 12.81‰ and 14.44‰, the mean value is 13.40‰; the δ 34 S V-CDT values of sphalerite are range from 10.87‰ to 14.00‰, the mean value is 12.53‰; the δ 34 S V-CDT values of galena are range from 8.35‰ to 9.83‰, the mean value is 8.84‰, and they have the feature of δ 34 S pyrite >δ 34 S sphalerite >δ 34 S galena , which indicates the sulfur isotope in ore-forming fluids has attained equilibrium. The δ 34 S V-CDT values of the deposit are close to those of sulfates from carbonate strata of different ages in the ore-field (15‰), which suggests that the sulfur in the ore-forming fluids should be derived from the thermo-chemical sulfate reduction of sulfates from the sedimentary strata.

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Sulfur isotopic composition of the Tianqiao Pb-Zn ore deposit, Northwest Guizhou Province, China: Implications for the source of sulfur in the ore-forming fluids

et al. 2010

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“…Likewise, sulphur and strontium isotopes can be used to trace the sources of S, Ca, Sr, and Ba in metallogenic systems effectively (Ruiz and Kesler, ; Barbieri and Bellanca, ; Hoefs, ; Jiang et al , ; Chen et al , , ; Zhu et al , ; Li et al , ; Wang et al , ; ). Nevertheless, the use of only single‐isotope data may yield incomplete conclusions, and it may even result in contradictory conclusions (Dejonghe et al , ). Therefore, carrying out multiple isotopic tracer studies is a preferable approach in metallogenic research.…”

Section: Introductionmentioning

confidence: 99%

The source of Fengjia and Langxi barite–fluorite deposits in southeastern Sichuan, China: evidence from rare earth elements and S, Sr, and Sm–Nd isotopic data

et al. 2016

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The barite-fluorite metallogenic belt in southeastern Sichuan is one of the most important barite-fluorite ore-concentrated areas in China. In order to find the ore-forming source and the mineralization age of the Fengjia and Langxi barite-fluorite deposit, we systematically evaluated the rare earth element (REE) contents and isotopic characteristics of S, Sr, and Sm-Nd. The results show that the δ34S values of barites and pyrites are high and similar to S isotopic values of gypsum in the Cambrian Qingxudong Formation (∈ 1 q), suggesting that the sulphur source was from Cambrian evaporite strata. The initial 87 Sr/ 86 Sr ratios of fluorites and barites range from 0.708800 to 0.712999, and these values are similar to Cambrian carbonate rocks and Lower Ordovician limestone. Except for black shales of the Lower Cambrian Niutitang Formation, the Ba content of other strata was generally low. The REE characteristics of barite and fluorite have close relationships, in regard to the source of ore-forming materials, to the Lower Cambrian Niutitang Formation black shales. Hence, we have concluded that the Cambrian carbonate rocks and Lower Ordovician limestone provide the source of calcium for mineralization and that the source of barium comes from the Lower Cambrian Niutitang Formation black shales. The fluorine contents of the Upper Sinian Doushantuo Formation and the Lower Cambrian Mingxinshi Formation are much higher than other strata, and these formations could provide the source for fluorine. The Sm-Nd isochron age of fluorites is 104 ± 11 Ma, which demonstrates that the mineralization mainly occurred during the late Yanshanian.

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“…The fluid inclusions in barite have been studied (Dejonghe, Guilhaumou & Touray, 1982a;Dejonghe, 1985). All the syngenetic inclusions are single-phased at room temperature.…”

Section: The Chaudfontaine Deposit and Its Country Rocksmentioning

confidence: 99%

“…(1986) have stressed that the palaeogeographic environment of the Chaudfontaine area at the end of the Frasnian was one of very shallow water. Studies on fluid inclusions (Dejonghe et al, 1982a;Dejonghe, 1985) have shown that the viscosity of the brines in which the barite was precipitated is not very high. These two conditions do not favour the continuous growth of nuclei and crystallites because their free fall through the brine would have been very brief.…”

Section: Growth Of Millimetric Barite Crystalsmentioning

confidence: 99%

The sedimentary structures of barite: examples from the Chaudfontaine ore deposit, Belgium

Dejonghe

1990

Sedimentology

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The Chaudfontaine ore deposit is composed mainly of barite and hosted in Frasnian shale and carbonate formations of Belgium. Thirteen sedimentary structures involving barite crystals are described and discussed. Many of these structures appear to have developed under gravity control. The role of mechanical and chemical ore apposition processes are detailed in each case. The study shows that two populations of barite were formed: (1) crystals which grew in brine above the water‐sediment interface and (2) crystals which developed in the sediment during early diagenesis. The two modes of formation have specific sizes, habits and structures. Both populations crystallized under the control of the prevailing physico‐chemical conditions, and the size and abundance of the barite crystals may be expressed as a function of the degree of barium supersaturation. High‐energy currents and unstable sediment caused previously deposited crystals to be reworked. Morphological similarities were found between Chaudfontaine barite and gypsum from evaporites.

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Isotope geochemistry (S, C, O, Sr, Pb) of the Chaudfontaine mineralization (Belgium)

Cited by 18 publications

References 17 publications

Sulfur isotopic composition of the Tianqiao Pb-Zn ore deposit, Northwest Guizhou Province, China: Implications for the source of sulfur in the ore-forming fluids

Sulfur isotopic composition of the Tianqiao Pb-Zn ore deposit, Northwest Guizhou Province, China: Implications for the source of sulfur in the ore-forming fluids

The source of Fengjia and Langxi barite–fluorite deposits in southeastern Sichuan, China: evidence from rare earth elements and S, Sr, and Sm–Nd isotopic data

The sedimentary structures of barite: examples from the Chaudfontaine ore deposit, Belgium

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