Chloritization


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chloritization

[‚klȯr·əd·ə′za·shən]
(chemistry)
The introduction of, production of, replacement by, or conversion into chlorite.

Chloritization

 

a metasomatic process in which the dark minerals of rocks and sometimes also the matrix itself are replaced by chlorites. Different types of chloritization are distinguished: regional postmagmatic chloritization of basic effusive rocks and their tuffs (seeGREENSTONE); chloritization of basic lavas associated with albitization (seeSPILITE) and of the dark minerals of acidic and intermediate igneous rocks (for example, the biotite and hornblende in granitoids); and hydrothermal chloritization of various rocks as a commonly occurring type of alteration near ores (seePROPYLITIZATION). The development of linear zones of chloritization indicates the presence of hydrothermal ore deposits.

References in periodicals archive ?
Intensive chloritization of the metasomatic biotite is observed in the Xinzhou 1000 m drill cores, and chloritization is an essential process in which Mg-rich chlorite is produced.
Chloritization of smectite, usually with corrensite as a transition phase, is a basic process of a change for 2:1 trioctahedral clay minerals (Ca and Mg smectite).
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.
In this depth range, the contents of [Na.sup.+], [K.sup.+], [Ca.sup.2+], and HC[O.sub.3.sup.-] significantly declined (Figure 5), which might be due to the precipitation of Cc4 as well as illitization and chloritization of K.
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. Similarly the intergrowth reaction between plagioclase and k-feldspar produces fine blebs of quartz by myrmekitization which is extremely susceptible to ASR.
and Amouric, M.: 1984, Biotite chloritization by interlayer brucitization as seen by HRTEM.
the last Hercynian phase of folding, the overthrusting of the basement by the cover rocks with lamination of the dolomite and country rock, the percolation of magnesian hydrothermal fluids and chloritization of the aluminosilicate facies (mica schist, aplite, pegmatite), and finally metasomatic "talcification" of the dolomite and siliceous rocks.
This displacement is accompanied by hydrothermal alteration of granodiorite porphyries (chloritization and albitization).
Silicification, sericitisation and chloritization are the principal alteration types observed in the mine.