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The introduction of, production of, replacement by, or conversion into chlorite.



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 ?
The proportion of smectite and kaolinite in Sm/Ka could not be calculated by peak shift analysis (Wilson 1987) because of the restricted shifting of the 7.0A peak towards lower angles on glycolation due to a partial chloritisation of the smectite interlayers.
There are two distinct periods of primary mineralisation and the copper minerals appear to have been deposited in the second phase, accompanied by intense chloritisation of the host rocks (Pryor et al, 1972).