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Argillic alteration is hydrothermal alteration[citation needed] of wall rock which introduces clay minerals including kaolinite, smectite and illite. The
Argillic_alteration
Argillic is a term used in the United States Department of Agriculture Soil taxonomy to describe a subsurface horizon categorized by clay-enrichment. It
Argillic
Geological process
between the quartz-sericite assemblage. Phyllic alteration is often closely associated with argillic alteration, which occurs at lower temperatures and dominantly
Phyllic_alteration
Chemical alteration of a rock by hydrothermal and other fluids
This is common in porphyry copper and porphyry molybdenum deposits. Argillic alteration, commonly present in the distal areas of porphyry deposits, is a
Metasomatism
metamorphic rocks; in bauxite deposits and from sulfate enriched argillic alteration (high silica and clay) associated with hydrothermal systems often
Svanbergite
Peru gold mine
or in the pyroclastic ignimbrite sequences, as in Yanacocha Sur. Argillic alteration commenced 11.5 Ma in the southwest part of the district at Cerro
Yanacocha
Geologic Feature
activity, during which sulfide deposition occurs in veins and retrograde alteration is common. There is a very close spatial association with the granite
Hydrothermal_mineral_deposit
Type of igneous rock body
intense bleach, the Spring Gulch chonolith displays a prominent argillic alteration. The estimated age of the Spring Gulch chonolith is about 156.4±0
Chonolith
Mine in Atacama Region, Chile
"mushroom-like". Some of the richest mineralizations are associated with argillic alteration. By 1991 the cutoff grade was 1 gram gold (or gold-value equivalent)
La_Coipa
Massif in British Columbia, Canada
gold-bearing quartz veins were discovered in 1980 within a zone of argillic alteration covering an area of more than 3 km2 (1.2 mi2). In 1982, a number
Heart_Peaks
Soil formation theory
(the solum). These processes contribute to the formation of eluvial and argillic horizons and an increased concentration of iron oxides, aluminum oxides
Biorhexistasy
Soil layer whose physical characteristics differ from the layers above and beneath
Diagnostic subsurface horizons Agric horizon Albic horizon Anhydric horizon Argillic horizon Calcic horizon Cambic horizon Duripan layer Fragipan layer Glossic
Soil_horizon
Argentinian volcano
assemblages of anhydrite, biotite and magnetite are also found. An earlier argillic (clay) cap over the deposit was eroded away. Alto de la Blenda has shown
Farallon_Negro_(volcano)
Geological formation in Argentina
mottling, and distinctively numerous hematite nodules and clay films (argillic horizons). They are classified as argillisols or alfisols, buried in relatively
Ischigualasto_Formation
Village in Herefordshire, England
Raglan Mudstone Formation of the Lower Old Red Sandstone. The soils are argillic brown earths, of high fertility. The historical layout of the settlement
Weobley
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