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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The pyrite is related to sericitization, the sphalerite is related to kaolinization and seritization, and the galena is related to chloritization and epidotization (Figure 5).
The mineral composition of the main components in rocks adds no information: total sericitization and regenerational displacement of quartz in the final lithification process mask the primary characteristics of rock formation.
In active orogenic belt hydrothermal fluids alter feldspar and plagioclase into extremely fine grained quartz and mica in the form of muscovite or sericite by sericitization while the same fluids alter biotite and garnets into chlorite by chloritization.
Often is this alteration accompanied by sericitization and argilization of plagioclase.
It originated by massive sericitization of feldspars.
These features likely reflect hydrothermal alteration (e.g., silicification, sericitization, and chloritization), as indicated by petrographic observation, and are not the result of magmatic fractionation.
Sericitization continues into the orebody and K-silica alteration is sometimes developed in association with high grade ore.
Wall-rock alteration is intense and consists of silicification, sericitization, chloritization, carbonatization, and kaolin, followed by epidotization with pyrophyllite.
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.
The hydrothermal alterations associated with Ag-Pb-Zn mineralization in the Zhijiadi deposit mainly include silicification, carbonation, sericitization, and chloritization.
Within the Central Zone, Main Stage veins are enclosed by broad envelopes of pervasive sericitization with silicification immediately adjacent to the veins.