Footwall mineralogy of the Old Waite massive sulphide deposit, Noranda, Quebec; hydrothermal prograde and retrograde
|Authors:||Clarke, D. S.|
|Volume Title:||Proceedings of the Mineralogy-petrology symposium|
|Source:||p.129-134; Mineralogy-petrology symposium, Sydney, N.S.W., Australia, Feb. 1989. Publisher: AusIMM, Sydney, N.S.W., Australia|
|Summary:||The mined-out Old Waite volcanogenic Cu-Zn deposit lies in the Noranda mining district of NW Quebec. The deposit has a distinctive pipe-like zone of alteration beneath the massive ore, extending into the stratigraphic footwall. The hydrothermal metasomatism within the alteration pipe produced a concentric zonation, with a peripheral quartz-sericite-chlorite mineral assemblage surrounding an axial core of magnesian chlorite- phlogopite. Prograde contact metamorphism of the peripheral alteration assemblages at Old Waite formed cordierite- anthophyllite-biotite assemblages; the phlogopite-bearing assemblages, however, were only partially modified with minor transformation to cordierite. The chemistry of the micas and amphibole reflects that of their host rock within the alteration pipe, indicative of metamorphic equilibria and supporting the textural evidence for their metamorphic origin. All of the mineral assemblages below the Old Waite deposit have been modified by retrograde metamorphic transformations. The dominant retrograde mineral is chlorite, variously accompanied by sericite, quartz, ilmenite and sphene. Parent and product mineral chemistry indicates that these transformations were generally isochemical at hand-specimen scale for all major elements. [J.M.H.]|
|Subjects:||Foot wall; Hydrothermal alteration; Massive deposits; Massive sulfide deposits; Metal ores; Metamorphism; Metasomatism; Mineral composition; Prograde metamorphism; Retrograde metamorphism; Canada; Eastern Canada; Noranda Quebec; Quebec; Old Waite Deposit|
|Copyright Information:||GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data supplied by Institute of Geological and Nuclear Sciences Limited (GNS Science)|
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