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Hydrothermal Alteration by Veins
1995Sedimentary series, as well as crystalline basements, are cross-cut by fracture networks along which fluids of different origins (meteoric, connate, metamor-phic, magmatic) have percolated. Chemical interactions with rocks along these pathways produce secondary minerals among which phyllosilicates are usually the dominant species.
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Zeolites in Hydrothermally Altered Rocks
Reviews in Mineralogy and Geochemistry, 2001Over the past 40 years, two universally accepted maxims of geology dealing with zeolite minerals have been shown to be incorrect: the first is that zeolites occur primarily as cavity fillings in basaltic igneous rocks, and the second is that these zeolites crystallized from so-called hydrothermal solutions, i.e. thermal waters from depth.
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Hydrothermal alteration of igneous rocks
Geological Society of America Bulletin, 1939Many studies of individual examples of hydrothermal alteration have been made, but a general summary has not appeared since 1915. The changes due to hydrothermal alteration are textural, mineralogical, and chemical. As a rule the primary texture is destroyed, roughly in proportion to the intensity of alteration, but only in extreme examples is it ...
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Hydrothermal alteration of Phosphoria mudstones [Montana]
Journal of Sedimentary Research, 1957Abstract Samples of phosphatic mudstone collected from several measured sections in the Retort Phosphatic Shale Member of the Phosphoria Formation near Divide, Montana, contain an abundance of montmorillonite, locally associated with kaolinite and talc.
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Facies and types of hydrothermal alteration
Economic Geology, 1963J. J. Hemley, P. B. Hostetler
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