silicification
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Related to silicification: petrifying
silicification
[sə‚lis·ə·fə′kā·shən] (geology)
Introduction of or replacement by silica. Also known as silification.
Also found in: Dictionary, Wikipedia.
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References in periodicals archive
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Silicification was identified in an isolated outcrop near to a hot spring (Hotel Termales del Ruiz) in the road El Arbolito--La Enea.
The 'lavender-blue' group comprises a range of silicification types, varying from bluish-grey to black, from porous to cherty, and from non-fossiliferous to richly fossiliferous.
This 480m zone of alteration is characterised by silicification, carbonation, veining and brecciation indicating an extensive mineralised hydrothermal system.
The targets exhibit multiple episodes of silicification, brecciation, alteration and gold-silver values and ratios typical of the upper levels of gold-silver mineralised systems in the district.
Underlying the quartz stockwork zone was a series of highly foliated felsic to mafic volcanic sequences showing varying amount of carbonatization and silicification alteration.
Geologic and alteration mapping have outlined a roughly 2sqkm area featuring typical high sulphidation epithermal systems including silicification and brecciation, alunite, kaolinite and dickite.
An epithermal zone of silica veining and silicification in tuffaceous volcanic wall rocks has been traced for 700m of strike length and to depths of 80m to 110m vertically below surface.
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