An Ordovician rift environment for the Memphremagog polymetallic massive sulphide deposit, Appalachian Ophiolite Belt, Quebec

Trottier, Jacques; Brown, Alexandra; Gauthier, Michel

doi:10.1139/e91-171

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…Mn nodules from the Ordovician were found in the Appalachians, close to the study area, in the St. Daniel Fm. (Trottier et al, 1991). Lawrence Platform and the Appalachian Mountains.…”

Section: Origin and Evolution Of Trace Elements In Rocks And Their Rementioning

confidence: 99%

Linking groundwater quality to residence times and regional geology in the St. Lawrence Lowlands, southern Quebec, Canada

Saby

Larocque

Pinti

et al. 2016

Applied Geochemistry

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The assessment of groundwater quality in shallow aquifers is of high societal relevance given that large populations depend directly on these water resources. The purpose of this study was to establish links between groundwater quality, groundwater residence times, and regional geology in the St. Lawrence Lowlands fractured bedrock aquifer. The study focuses on a 4500 km 2 watershed located in the St. Lawrence Lowlands of the province of Quebec in eastern Canada. A total of 150 wells were sampled for major, minor, and trace ions. Tritium (3 H) and its daughter element, 3 He, as well as radiocarbon activity (A 14 C) were measured in a subset of wells to estimate groundwater residence times. Results show that groundwater evolves from a Ca-HCO 3 water type in recharge zones (i.e., the Appalachian piedmont) to a Na-HCO 3 water type downgradient, toward the St. Lawrence River. Locally, barium (Ba), fluoride (F), iron (Fe), and manganese (Mn) concentrations reach 90, 2, 18, and 5.9 mg/L respectively, all exceeding their respective Canadian drinking water limits of 1, 1.5, 0.3, and 0.05 mg/L. Release of these elements into groundwater is mainly controlled by the groundwater redox state and pH conditions, as well as by the geology and the duration of rock-water interactions. This evolution is accompanied by increasing 3 H/ 3 He ages, from 4.78±0.44 years upgradient to more than 60 years downgradient. Discrepancies between calculated 3 H/ 3 He and 14 C water ages (the latter ranging from 280 ± 56 to 17,050 ± 3410 years) suggest mixing between modern water and paleogroundwater infiltrated through subglacial recharge when the Laurentide Ice Sheet covered the study area, and during the following deglaciation period. A linear relationship between 3 H activity and corrected 14 C versus Mg/Ca and Ba support a direct link between water residence time and the chemical evolution of these waters. The Ba, F, Fe, and Mn concentrations in

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“…Mn nodules from the Ordovician were found in the Appalachians, close to the study area, in the St. Daniel Fm. (Trottier et al, 1991). Lawrence Platform and the Appalachian Mountains.…”

Section: Origin and Evolution Of Trace Elements In Rocks And Their Rementioning

confidence: 99%

Linking groundwater quality to residence times and regional geology in the St. Lawrence Lowlands, southern Quebec, Canada

Saby

Larocque

Pinti

et al. 2016

Applied Geochemistry

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“…(Trottier et al, 1992). Au Dévonien moyen (380-368 Ma), les bassins siiuro-dévoniens sont déformés au cours de l'orogenèse acadienne (Tremblay et Castonguay, 2002;.…”

Section: La Ceinture De Gaspéunclassified

Géochronologie K-Ar et transfert de matière le long de systèmes de failles et de fractures dans la lithosphère continentale :

Sasseville¹

2009

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“…Gudmundite (FeSbS) occurs in some sulphide deposits (Wagner and Jonsson, 2001), Sb deposits (Normand et al, 1996), and gold deposits associated with arsenopyrite (Deschênes et al, 2009a(Deschênes et al, , 2009bDing et al, 2014). In addition, it is associated with ferroan dolomite and pyrrhotite as early impregnations in the host 4 rocks at the margin of veins and in silicified fault zones (Trottier et al, 1991), and occurs mainly with gangue minerals, such as chlorite, quartz, calcite and plagioclase (Minz et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

First-principles calculations of sulphur isotope fractionation in MX2 minerals, with M= Fe, Co, Ni and X2= AsS, SbS

Liu

Gong

et al. 2016

Chemical Geology

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Iron, Co and Ni are first row transition metals and are all able to combine with S, As, and Sb to form disulphides, sulpharsenides and sulphantimonides, respectively, all of which exhibit substitutions of metal and metalloid elements in their structures. As an important tracer in the geochemistry of ore deposits, S isotope fractionation in sulphides can be used to analyse the ore-forming process and the source of ore-forming elements. However, there have been few studies of S isotope fractionation in sulpharsenides and sulphantimonides. Studying the isotope fractionation of the various members of this structural group can provide systematic information regarding S isotope fractionation in transition metal disulphides, sulpharsenides and sulphantimonides. In this paper, the S isotope fractionation parameters for Fe, Co and Ni sulpharsenides and sulphantimonides were calculated using first-principles methods based on density functional theory in the temperature range of 0-1000 ºC. Our calculations show that the order of heavy S isotope enrichment is arsenopyrite > cobaltite > gudmundite > costibite >

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An Ordovician rift environment for the Memphremagog polymetallic massive sulphide deposit, Appalachian Ophiolite Belt, Quebec

Cited by 6 publications

References 11 publications

Linking groundwater quality to residence times and regional geology in the St. Lawrence Lowlands, southern Quebec, Canada

Linking groundwater quality to residence times and regional geology in the St. Lawrence Lowlands, southern Quebec, Canada

Géochronologie K-Ar et transfert de matière le long de systèmes de failles et de fractures dans la lithosphère continentale :

First-principles calculations of sulphur isotope fractionation in MX2 minerals, with M= Fe, Co, Ni and X2= AsS, SbS

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