Oxygen isotope zonation and alteration in the northern Noranda District, Quebec; evidence for hydrothermal fluid flow

Paradis, Suzanne; Taylor, B. E.; Watkinson, David H.; Jonasson, I R

doi:10.2113/gsecongeo.88.6.1512

Cited by 30 publications

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“…In these cases, the groundmass almost entirely consists of granular epidote and quartz (9:1 ratio, respectively) and many of the phenocrysts, felsic or mafic, are overprinted by granular epidote and quartz. Such features in intermediate to mafic volcanic rocks of Noranda, Quebec, have been attributed to semi-conformable hydrothermal alteration zones associated with VMS deposits (Galley 1993;Gibson and Kerr 1993;Paradis et al 1993); consequently, we interpret the mineralogically and texturally identical epidote-quartz patches in the Hidden and Louis formations to have resulted from hydrothermal alteration associated with the massive sulphide mineralization.…”

Section: Petrographic Observationsmentioning

confidence: 78%

Petrogenesis of the 1.9 Ga mafic hanging wall sequence to the Flin Flon, Callinan, and Triple 7 massive sulphide deposits, Flin Flon, Manitoba, CanadaThis is a companion paper to DeWolfe, Y.M., Gibson, H.L., Lafrance , B., and Bailes, A.H. 2009. Volcanic reconstruction of Paleoproterozoic arc volcanoes: the Hidden and Louis formations, Flin Flon, Manitoba, Canada. Canadian Journal of Earth Sciences, 46: this issue.

2009

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A detailed study of the geochemical and isotopic characteristics of the volcanic rocks of the Hidden and Louis formations, which make up the hanging wall to the volcanogenic massive sulphide deposits at Flin Flon, Manitoba, was carried out on a stratigraphically controlled set of samples. The stratigraphy consists of the lowermost, dominantly basaltic, Hidden formation, and the overlying, dominantly basaltic, Louis formation. Of importance petrogenetically, is the 1920 unit a basaltic andesite with Nb/Thmn = 0.54-0.62, 3Nd(1.9Ga) = +3.6-+5.9, 3Hf(1.9Ga) = +8.5-+9.6, and 204 Pb/ 206 Pb = 23.9. The basaltic flows that dominate the Hidden formation have Nb/Thmn = 0.16-0.29, 3Nd(1.9Ga) = +1.7-+4.4, 3Hf(1.9Ga) = +7.0-+11.8 and 204 Pb/ 206 Pb = 16.9-18.6). The Carlisle Lake basaltic-andesite (top of Hidden formation) is characterized by Nb/Thmn = 0.16-0.14, and 204 Pb/ 206 Pb = 21.4. The rhyodacitic Tower member (bottom of Louis formation) has Nb/Thmn = 0.23, 3Nd1.9Ga = +4.6, 3Hf1.9Ga = +9.3, and 204 Pb/ 206 Pb = 22.2. The basaltic flows that dominate the Louis formation have Nb/Thmn = 0.18-0.25, 3Nd(1.9Ga) = +3.6-+4.2, 3Hf(1.9Ga) = +8.4-+11.3 and 204 Pb/ 206 Pb = 17.9. The Hidden and Louis formations show dominantly transitional arc tholeiite signatures, with the 1920 unit having arc tholeiite characteristics. It is interpreted to have formed through extensive fractional crystallization of differentiated magmas at shallow levels in oceanic crust. Given the geological, geochemical, and isotopic characteristics of the Hidden and Louis formations, they are interpreted to represent subducted slab metasomatism with minor contamination from subducted sediments.Résumé : Une étude détaillée des caractéristiques géochimiques et isotopiques des roches volcaniques des formations de Hidden et de Louis, lesquelles forment l'éponte supérieure des gisements de sulfures volcanogènes massifs à Flin Flon, Manitoba, a été effectuée sur un ensemble d'échantillons contrôlés par la stratigraphie. La stratigraphie comprend, tout à la base, la formation de Hidden, principalement basaltique et la formation de Louis sus-jacente, principalement basaltique. L'unité 1920, une andésite basaltique, est importante d'un point de vue pétrogénétique; elle possède les valeurs suivantes : Nb/Th mn = 0.,54-0,62, 3Nd (1.9Ga) = +3,6 à +5,9, 3Hf (1.9Ga) = +8,5 à +9,6, et 204 Pb/ 206 Pb = 23.9. Les coulées basaltiques qui dominent la formation de Hidden ont les valeurs suivantes : Nb/Th mn = 0,16-0.29, 3Nd (1.9Ga) = +1,7 à +4,4, 3Hf (1.9Ga) = +7,0 à +11,8 et 204 Pb/ 206 Pb = 16,[9][10][11][12][13][14][15][16][17][18]6). L'andésite basaltique Carlisle Lake (sommet de la formation de Hidden) est caractérisée par Nb/Th mn = 0,16-0,14 et 204 Pb/ 206 Pb = 21,4. Le membre Tower (bas de la formation de Louis) a les valeurs suivantes : Nb/Th mn = 0,23, 3Nd 1.9Ga = +4,6, 3Hf 1.9Ga = +9,3 et 204 Pb/ 206 Pb = 22,2. Les coulées basaltiques qui dominent la formation de Louis ont les valeurs suivantes : Nb/Thmn = 0,18-0,25, 3Nd(1.9Ga) = +3,6 à +4,2, 3Hf(1.9Ga) = +8,4 à +11...

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Section: Petrographic Observationsmentioning

confidence: 78%

Petrogenesis of the 1.9 Ga mafic hanging wall sequence to the Flin Flon, Callinan, and Triple 7 massive sulphide deposits, Flin Flon, Manitoba, CanadaThis is a companion paper to DeWolfe, Y.M., Gibson, H.L., Lafrance , B., and Bailes, A.H. 2009. Volcanic reconstruction of Paleoproterozoic arc volcanoes: the Hidden and Louis formations, Flin Flon, Manitoba, Canada. Canadian Journal of Earth Sciences, 46: this issue.

2009

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“…The complete dissolution of Zn from the andesite rocks and the overall erratic Cu concentrations associated with epidote-quartz alteration suggest that temperatures of hydrothermal fluids were relatively low which is consistent with the temperature range of 230-260 °C indicated by oxygen isotope values of epidote-quartz pairs from the Noranda Cauldron (Paradis et al, 1993). Although preliminary whole rock oxygen isotope data on The fluid:rock ratio of 75-100 calculated for the epidote-quartz patches in the Noranda Cauldron represents the net effect of hydrothermal alteration that has likely developed during multiple fluid:rock interactions.…”

Section: Epidote-quartz Alteration and The Vhms Modelsupporting

confidence: 72%

“…These data are consistent with the estimates from Hoy (1993) and suggest that most epidote formed in the CNVC at temperatures less than 300 °C. The mineral pairs obtained by Paradis et al (1993) were derived from quartz-epidote amygdules which commonly reflect the lower temperature range for fluids in a hydrothermal system. The overlap in epidote mineral compositions regardless of alteration texture, as determined b this study, suggests that this temperature range may also apply to the epidote-quartz patches.…”

Section: Epidote-quartz Alteration and Regional Oxygen Isotope Pattermentioning

confidence: 99%

“…The presence of semiconformable alteration characterizes a regionally developed hydrothermal system which reflects lateral hydrothermal fluid flow and so the horizontal scale in this model can also be extended. Oxygen isotope geochemistry of the volcanic rocks in the NVC depicts a hydrothermal system developed over a 20 km 2 area that is represented partially by the semi-conformable alteration mineral assemblages (Cathles, 1993;Paradis et al, 1993).…”

Section: The Noranda Vhms Modelmentioning

confidence: 99%

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The paragenetic relationships of epidote-quartz hydrothermal alteration within the Noranda Volcanic Complex, Quebec.

Santaguida¹

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“…D. δ 18 O vs. CCPI alteration index for the Lemoine rhyolite alteration assemblages. The fractionation is calculated using the empirical rock-water fractionation proposed by Paradis et al (1993), based on data in Harper et al (1988).…”

Section: Oxygen Isotopesmentioning

confidence: 99%

The Lemoine Auriferous Volcanogenic Massive Sulfide Deposit, Chibougamau Camp, Abitibi Greenstone Belt, Quebec, Canada: Geology and Genesis

Mercier-Langevin¹,

Lafrance²,

Bécu³

et al. 2013

Economic Geology

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The Lemoine auriferous volcanogenic massive sulfide deposit (0.76 Mt at 4.6 g/t Au, 4.2 wt % Cu, and 9.5 wt % Zn) is part of the Chibougamau camp located in the northeastern part of the Abitibi greenstone belt. The deposit is hosted by a steeply dipping, S-facing homoclinal volcanic succession (~2729−2726 Ma Waconichi Formation, Lemoine Member) composed of effusive and intrusive tholeiitic rhyolites and andesites cut by comagmatic diorite and gabbro dikes and overlain by transitional to mildly calc-alkaline basalts, andesites, and rhyolites.Seven predominant synvolcanic alteration assemblages, now intensely deformed and metamorphosed to upper greenschist facies, were defined based on their mineralogy and position relative to ore. Albite-quartz, sericite-carbonate, sericite-chlorite, sericite-chlorite-(Zn), and chlorite-sericite-epidote-carbonate assemblages define semiconcordant zones that are stacked from the paleoseafloor to the deep footwall. In contrast, chlorite and chlorite-sericite-chloritoid assemblages overprint the other alteration zones and form subconcordant to now transposed discordant zones in the deposit footwall. Most alteration assemblages are characterized by relative SiO2, CaO, and Na2O mass losses and relative FeO, MgO, K2O, and CO2 mass gains. Whole-rock oxygen isotopes indicate that the temperatures of alteration ranged from ~100° to 150°C (sericite-carbonate assemblage) to ≥350°C (sericite-chlorite, chlorite-sericite-chloritoid, and chlorite assemblages). The chloritesericite-chloritoid assemblage, and to some extent the sericite-chlorite assemblage, are associated with strong to near total depletion of light rare earth elements possibly due to reaction with Cl-bearing, mildly acidic fluids at depth in the ore-forming hydrothermal system.The sulfide lens was formed in part on the seafloor and in part by subseafloor replacement. The massive sulfides are particularly rich in Bi, suggesting a possible magmatic input into the Lemoine ore-forming hydrothermal system. High Bi concentrations in the mineralizing system are likely to have enhanced Au precipitation by scavenging the precious metal from the hydrothermal fluids. The Au-rich nature of the Lemoine auriferous volcanogenic massive sulfide deposit can be explained by a combination of very efficient metal transport, highly effective capture of metals at or near the seafloor, and a possible magmatic contribution to the hydrothermal

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Oxygen isotope zonation and alteration in the northern Noranda District, Quebec; evidence for hydrothermal fluid flow

Cited by 30 publications

References 0 publications

The paragenetic relationships of epidote-quartz hydrothermal alteration within the Noranda Volcanic Complex, Quebec.

The Lemoine Auriferous Volcanogenic Massive Sulfide Deposit, Chibougamau Camp, Abitibi Greenstone Belt, Quebec, Canada: Geology and Genesis

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