(redirected from chloritisation)
Also found in: Dictionary.


The introduction of, production of, replacement by, or conversion into chlorite.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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).