Geochemistry of hydrothermally altered rocks at the Horne Mine, Noranda, Quebec

MacLean, W. H.; Hoy, Lawrence D.

doi:10.2113/gsecongeo.86.3.506

Cited by 78 publications

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“…Sodium and Ca depletion haloes are recognized below the Norbec and other massive sulphide deposits in the Noranda district. Both depletions and enrichments in K, Fe, Mg, Si and other elements have been reported (Hall 1982;Riverin and Hodgson 1980;Barrett et al 1991;MacLean and Hoy 1991;Maclean and Barrett (in press)). These features have been widely used as prospecting aids along with a number of element ratios that monitor intensity of chloritization and sericitization.…”

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confidence: 71%

Mass, volume and chemical changes in the alteration zone at the Norbec mine, Noranda, Quebec

Shriver

MacLean

1993

Mineral. Deposita

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Abstract.A funnel-shaped alteration pipe in Archean rhyolite and andesite below massive sulphide Zn-Cu ores at the Norbec mine in northwestern Quebec was outlined from drill core samples, geochemical parameters, and normative alteration mineralogy. The pipe has a mass of 37.9 million tonnes giving a volume of 13 x 106 m 3, which represents volume increase of 10% relative to the unaltered host volcanic rocks. A bulk chemical composition was calculated using "weighting" procedures for "volumes of influence" for the samples. Net mobile mass change, or chemical flux, for the alteration pipe was + 5.8 x 10 6 tonnes; inclusion of the massive ore lens yields a flux of + 9.6 • 10 6 tonnes for the whole hydrothermal system. The largest additions to the system in millions of tonnes were: FeO(+ 4.2), SiO2(+ 3.8), S(+ 1.8), K20(+0.55), and MgO(+ 0.5); the only depletions were Na20 ( -1.4), and CAO(-0.44). Base and precious metals accounted for 3.4% of the total element flux.Alteration zones below volcanogenic massive sulphide deposits commonly are confined to pipe-shaped volumes of rock that have been subjected to intense hydrothermal fluid flow. The fluids exited onto paleo-seafloors as metalbearing hot springs to form conformable lenses of massive sulphide ore (Franklin et al. 1981;Lydon 1984Lydon , 1988. The alteration pipes commonly expand upwards into funnelshaped outlines near the rock-seawater interface. The altered rocks have undergone major chemical and mineralogical changes, and many components have been leached while others were deposited. The bulk chemical compositions of alteration pipes have not been well documented, nor have the input and output of chemical components (the chemical flux) during the ore forming process been measured. It is now possible to measure these changes using elements that can be shown to be immobile in the system, and by applying the techniques developed by MacLean and Kranidiotis (1987) and MacLean (1990).

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confidence: 71%

Mass, volume and chemical changes in the alteration zone at the Norbec mine, Noranda, Quebec

Shriver

MacLean

1993

Mineral. Deposita

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“…Through comparisons to the VHMS-rich Abitibi greenstone belt of Canada (Lesher et al, 1986;Barrie et al, 1993) it is clear felsic rocks of the Yilgarn Craton display a similar, broad range of geochemical characteristics, ranging from unprospective (FI affinity) to highly-prospective (FIIIb affinity) (Figs. 9 and 10; MacLean and Hoy, 1991;Mercier-Langevin et al, 2007;Gaboury and Pearson, 2008). VHMS-bearing felsic rocks in the Yilgarn Craton (e.g.…”

Section: Areas Associated With Vhms Mineralizationmentioning

confidence: 99%

A review of volcanic-hosted massive sulfide (VHMS) mineralization in the Archaean Yilgarn Craton, Western Australia: Tectonic, stratigraphic and geochemical associations

Hollis

Yeats

Wyche

et al. 2015

Precambrian Research

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“…Sericite after chlorite and actinolite is another abundant alteration mineral in the BMD. It occurs as fine-grained needles ( Fig.6b) in altered rhyolitic tuffs and jaspilites and may have formed by the alteration of feldspars at 230-275º C (Maclean and Hoy, 1991).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Structural, textural, geochemical and isotopic signatures of synglaciogenic Neoproterozoic banded iron formations (BIFs) at Bafq mining district (BMD), Central Iran: The possible Ediacaran missing link of BIFs in Tethyan metallogeny

Mohseni

Aftabi

2015

Ore Geology Reviews

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Geochemistry of hydrothermally altered rocks at the Horne Mine, Noranda, Quebec

Cited by 78 publications

References 0 publications

Mass, volume and chemical changes in the alteration zone at the Norbec mine, Noranda, Quebec

Mass, volume and chemical changes in the alteration zone at the Norbec mine, Noranda, Quebec

A review of volcanic-hosted massive sulfide (VHMS) mineralization in the Archaean Yilgarn Craton, Western Australia: Tectonic, stratigraphic and geochemical associations

Structural, textural, geochemical and isotopic signatures of synglaciogenic Neoproterozoic banded iron formations (BIFs) at Bafq mining district (BMD), Central Iran: The possible Ediacaran missing link of BIFs in Tethyan metallogeny

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