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Title: Hydrothermal alteration of felsic volcanic rocks at the Helen Siderite Deposit, Wawa, Ontario

Journal Article · · Econ. Geol.; (United States)
;

Felsic lavas and pyroclastic rocks, underlying the Archean Helen iron-formation, have been variably altered by hydrothermal solutions which, when discharged onto the sea floor, formed the Helen siderite deposit. Within the footwall volcanic sequence five chemically and mineralogically distinct alteration types have been defined: least altered, sericite, chlorite chloritoid, and ankerite. Based on mineralogy and chemistry of the altered rocks and on the geometry of the alteration zones, an alteration model is proposed.

Research Organization:
Department of Geology, University of Minnesota-Duluth, Duluth, Minnesota
OSTI ID:
5240491
Journal Information:
Econ. Geol.; (United States), Vol. 79:6
Country of Publication:
United States
Language:
English

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Related Subjects

58 GEOSCIENCES
BASALT
HYDROTHERMAL ALTERATION
ROCK-FLUID INTERACTIONS
ONTARIO
SEAWATER
SIDERITE
CALCIUM
CARBON DIOXIDE
GEOCHEMISTRY
GEOLOGIC MODELS
IRON
MAGNESIUM
MANGANESE
METAMORPHISM
MINERALOGY
POTASSIUM COMPOUNDS
QUARTZ
SEA BED
SODIUM
ALKALI METAL COMPOUNDS
ALKALI METALS
ALKALINE EARTH METALS
CANADA
CARBON COMPOUNDS
CARBON OXIDES
CARBONATE MINERALS
CARBONATES
CHALCOGENIDES
CHEMISTRY
ELEMENTS
HYDROGEN COMPOUNDS
IGNEOUS ROCKS
IRON CARBONATES
IRON COMPOUNDS
IRON ORES
METALS
MINERALS
NORTH AMERICA
ORES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
ROCKS
SILICON COMPOUNDS
SILICON OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VOLCANIC ROCKS
WATER
580400* - Geochemistry- (-1989)