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Quartz-hematite veins in the St. Austell pluton feature an assemblage of authigenic kaolin, illite, chlorite and hematite. Similar assemblages occur in altered granites adjacent to the veins. Complex textures in the veins and altered granites show that kaolin was an initial precipitate from hydrothermal fluids that was subsequently replaced by illite, hematite and chlorite. The sequence of mineral precipitation reflects a kinetic control on crystal growth, with early non-equilibrium precipitation of kaohn from fluids with compositions appropriate for the equilibrium formation of illite. Hematite formed under relatively oxidizing conditions that subsequently became more reducing to permit the late precipitation of chlorite. Illite associated with the quartz-hematite veins differs texturally, mineralogically and chemically from the coarsely crystalline hydrothermal muscovite (sericite or gilbertite) associated with quartz-tourmaline veins and greisen. Quartz-hematite veins are thus considered to record a distinct mineralization event that is not related to the early greisenization or the economic kaolinization.
Author(s): Psyrillos A, Manning DAC, Burley S
Publication type: Article
Publication status: Published
Journal: Clay Minerals
Year: 2001
Volume: 36
Issue: 4
Pages: 585-597
Print publication date: 01/12/2001
ISSN (print): 0009-8558
ISSN (electronic): 1471-8030
Publisher: Mineralogical Society
URL: http://dx.doi.org/10.1180/0009855013640011
DOI: 10.1180/0009855013640011
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