Organic-matter alteration in an early Paleozoic basin: Zonation around mineral showings compared to that around intrusions, St. Lawrence Lowlands, Quebec, Canada

Héroux, Y.; Tassé, Normand

doi:10.1130/0016-7606(1990)102<0877:omaiae>2.3.co;2

Cited by 18 publications

(4 citation statements)

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“…Some calcites fall off the mixing line between the mantle and limestone reservoirs and trend towards the isotopic composition of CO 2 extracted from fluid inclusions in a late-stage cryolite with low d 13 C and elevated d 18 O values. A potential source for this (relatively low d 13 C) isotopic composition could be dissolved organic matter, which generally is thermally altered around intrusions in the St. Lawrence Lowlands (He¤ roux & Tasse¤ , 1990). Hence, C and O from organic matter are likely to have been mobilized and introduced into the syenites during the emplacement of the Mont Saint-Hilaire intrusion.…”

Section: Provenance Of the Late-stage Fluidsmentioning

confidence: 99%

The Magmatic to Hydrothermal Evolution of the Intrusive Mont Saint-Hilaire Complex: Insights into the Late-stage Evolution of Peralkaline Rocks

Schilling¹,

Marks²,

Wenzel³

et al. 2011

Journal of Petrology

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Section: Provenance Of the Late-stage Fluidsmentioning

confidence: 99%

The Magmatic to Hydrothermal Evolution of the Intrusive Mont Saint-Hilaire Complex: Insights into the Late-stage Evolution of Peralkaline Rocks

Schilling¹,

Marks²,

Wenzel³

et al. 2011

Journal of Petrology

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“…Dissolution of silicate minerals was not considered as a major process because of the small concentrations of silica (Si) found in the groundwater. Figure 7 shows that groundwater is mostly in equilibrium or oversaturated with respect to barite (BaSO 4(s) ), which was identified in the geological materials in the area (Héroux and Tassé, 1990;Tassé and Schrijver, 1989). Therefore, the negative loading (-0.785) of Ba 2+ ions, which is opposite to the positive loadings of Ca 2+ ions (0.725) and SO 4 2-ions (0.833) in component #4 ( Table 5), indicates that gypsum dissolution could exert a control over barium concentrations by favouring barite precipitation.…”

Section: Pca and Geochemical Processesmentioning

confidence: 99%

Groundwater Quality, Geochemical Processes and Groundwater Evolution in the Chateauguay River Watershed, Quebec, Canada

Blanchette¹,

Lefebvre²,

Nastev³

et al. 2010

Canadian Water Resources Journal

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A hydrogeochemical study was carried out in the Quebec portion of the Chateauguay River watershed. The objective was to characterize the chemical composition of groundwater in order to evaluate its quality and assess geochemical variations related to the geological and hydrogeological settings. Bulk groundwater samples were collected from 144 wells distributed evenly over the study area. Nine of the wells were sampled with a multi-level packer system, for a total of 22 multi-level samples. Groundwater shows a wide range of compositions as indicated by 12 water types defined on the basis of major ions with a weak variation of chemical composition with depth. The predominant water type, Ca-HCO 3 , occurs in most geological and hydrogeological settings. Principal Component Analysis (PCA) and geochemical graphs were used to identify the major processes that exert a control over the chemical composition of the groundwater. Approximately 80% of the geochemical variation can be explained by mixing between fresh recharge water with more saline water associated with the former Champlain Sea, which invaded the aquifer. Secondary processes are related to ion exchange and the potential dissolution of minerals. A cross-section along a major flow path shows that the geochemical evolution of groundwater leads to relations between water type groups, geochemical processes, and groundwater flow conditions. The hydrogeochemical conceptual model infers that carbonate dissolution during recharge leads to one end-member, a Ca-HCO 3 type water, which further evolves along its flow path due through ion exchange and mixing with remnant Champlain Sea water (Na-Cl), the other endmember. 504Canadian Water Resources Journal/Revue canadienne des ressources hydriques

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“…Restriction of sulfidized organic matter to areas in the Los Ranchos Formation where all Fe occurs as pyrite suggests that oxidation of ferrous iron was the principal agent in destabilizing Au-bisulfides and precipitating elemental gold at Pueblo Viejo (Kettler et al, 1990). Thermal alteration of organic matter is distinctly zoned around MVT mineral showings in the St. Lawrence Lowlands, Canada, suggesting that hydrothermal fluids provided the additional heat necessary for ore-associated enhancements of regional patterns of burial maturation (Heroux and Tasse, 1990).…”

Section: Role Of Organic Matter In Ore Formationmentioning

confidence: 99%

Introduction to geochemistry of metalliferous black shales

1992

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Organic-matter alteration in an early Paleozoic basin: Zonation around mineral showings compared to that around intrusions, St. Lawrence Lowlands, Quebec, Canada

Cited by 18 publications

References 0 publications

The Magmatic to Hydrothermal Evolution of the Intrusive Mont Saint-Hilaire Complex: Insights into the Late-stage Evolution of Peralkaline Rocks

The Magmatic to Hydrothermal Evolution of the Intrusive Mont Saint-Hilaire Complex: Insights into the Late-stage Evolution of Peralkaline Rocks

Groundwater Quality, Geochemical Processes and Groundwater Evolution in the Chateauguay River Watershed, Quebec, Canada

Introduction to geochemistry of metalliferous black shales

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