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 ?
There is significant quartz-dravite flooding in the holes, with strong alteration over 20 metres into the basement rocks, associated with strong fracturation, chloritization, and shearing, with replacement dravite and quartz mineralization.
The appearance of a similar phenomenon as an evident relict in the Dividal Group rocks of Lapland is remarkable, because during the local post-diagenetic deep changes (sericitization and chloritization of sedimentary rocks), the reduction, which is probably caused not by organic matter, but by other reductive fluids, encompasses the entire rock massive.
Clearly, hydrothermal breccias, related pervasive alteration and mineralization (silicification, chloritization, and greisenization) in GRI and GRII (Kooiman et al.
The expected gold mineralization will be associated with breccia zones where the fault rock has been intensely sheared, altered and replaced with intense hematite and magnetite, chloritization, silicification and copper oxides related to the fault.
There is significant quartz-dravite flooding in the hole, with strong alteration over 20 metres into the basement rocks, associated with strong fracturation, chloritization, shearing, with replacement dravite and quartz mineralization.
The Big Bug / Old Miner horizon is now thought, because of its intense chloritization, to be a vent feeder zone, so that the most likely place for a major deposit would be up-sequence and to the west, which would be in the Main Copper Mountain Claim Block.
Hydrothermal alteration zones, quartz-pegmatite veins and veinlets and dykes of sub-volcanic origins with intensive silicification, pyritization, and chloritization occur around the granodiorite stock body.
Alteration consisting of intense hematite and magnetite replacement, chloritization and silicification has been observed in the Copperstone Fault underground and is consistent with alteration visible in previous drilling and the current drilling from surface.
On the surface the alteration along the vein consists of chloritization and sericitization of wallrock as well as limonite staining common in the quartz-carbonate veins.
Alteration consisting of intense hematite and magnetite replacement, chloritization and silicification has been observed in the Copperstone Fault underground and is consistent with alteration visible in the very high grade intervals in the core holes previously drilled from surface which currently define the D-Zone.