Sericitization


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sericitization

[‚ser·ə‚sīd·ə′zā·shən]
(geology)
A hydrothermal or metamorphic process involving the introduction of or replacement by sericite.

Sericitization

 

a process in which plagioclases and other minerals are replaced by sericite through the action on rocks of low-temperature hydrothermal solutions. Wallrock metasomatism that accompanies the development of copper pyrite, complex, gold-silver, and antimony-mercury ores is typical of serialization. Frequently, sericitization develops in connection with the beresitization, listvenitization, propylitization, and silicification of rocks. The presence of sericitization is made use of in prospecting for ore bodies.

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Hydrothermal alteration of alkali-feldspar and plagioclase commonly results into the formation of quartz and white mica in the form muscovite or paragonite which are collectively termed sericite due to sericitization (Que and Allen 1996).
A black mineral of the tourmaline group is one of the most common Llallagua species, because sericitization of feldspars was followed by tourmalinization, and practically all of the original feldspar in the porphyry was replaced by fine-grained tourmaline.
Sericitization continues into the orebody and K-silica alteration is sometimes developed in association with high grade ore.
Albitization and sericitization of plagioclase led to the mobilization of Ca whereas elevated concentrations of K and Ba seem to be related to the newly formed hydrothermal K-feldspar.
Within the Central Zone, Main Stage veins are enclosed by broad envelopes of pervasive sericitization with silicification immediately adjacent to the veins.
The dacite in the lower part of the stock is marked by strong propylitization, sericitization and pyritization, whereas silicification dominates in the upper levels.
The dikes have undergone extensive hydrothermal alteration, typified by sericitization, kaolinization and pyritization.