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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
Soil type
classification for a brown earth with an eluvial horizon above a slightly argillic, clayey illuvial horizon. This gives rise to a universal division of these
Brown_earth
Copper mine in Romania
(2004). "Rosia Poieni copper deposit, Apuseni Mountains, Romania: advanced argillic overprint of a porphyry system". Miner Deposita. 39: 173–188. doi:10
Roșia_Poieni_copper_mine
Classification of soil types
in soil taxonomy with their major characteristics: Alfisols: Must have argillic, natric, or kandic horizon; high-to-medium base saturation; moderately
USDA_soil_taxonomy
Geological process
quartz-sericite assemblage. Phyllic alteration is often closely associated with argillic alteration, which occurs at lower temperatures and dominantly affects plagioclase
Phyllic_alteration
medium-grade metamorphic rocks; in bauxite deposits and from sulfate enriched argillic alteration (high silica and clay) associated with hydrothermal systems
Svanbergite
argillans, and soil horizons with sufficient clay illuviation are termed argillic horizons. Cutans provide physical evidence, observable in the field, as
Cutans
commonly forms below an albic horizon. It has less clay content than an argillic horizon but is still a visible layer. In the pedogenesis process under
Cambic_horizon
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
Neolithic henge monument in Wiltshire, England
lowland Britain changed around 4250–4000 BC. During the Neolithic period, argillic (clayey) brownearths reigned in the landscape formed by the acidifying
Avebury
Chemical alteration of a rock by hydrothermal and other fluids
biotite. This is common in porphyry copper and porphyry molybdenum deposits. Argillic alteration, commonly present in the distal areas of porphyry deposits,
Metasomatism
Clay soil rich in aluminium (Al) and iron (Fe)
root traces is the most likely cause of the intimate relationship between Argillic horizons, Alfisols, and forests. The large woody root traces can transport
Alfisol
Village in Cheshire, England
course grained arenaceous-rudaceous, surrounded by fine-grained to course argillic-rudaceous. Bradwall soil trace elements include Ag Al B Ba Be Bi Ca Cd
Bradwall
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
Peru gold mine
Oeste, 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
potassic, intermediate phyllic or QSP, and more distal propylitic and argillic alteration. Where veinlets are close together, the zones of alteration
Hydrothermal_mineral_deposit
Geological formation in the United States
Group Thickness Up to 886 ft (270 m) Lithology Primary Glauconitic to argillic sandstone Other Claystone, limestone Location Region North Carolina, South
Peedee_Formation
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
Place in Santa Fe, Argentina
silt-loam in texture, with very low sand content. It has well-defined, thick argillic horizons, hindering the penetration of roots and the distribution and use
Piñero_(Santa_Fe)
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
this pedon are an umbric epipedon from the surface to 13 inches and an argillic horizon from 13 to 100 inches. Base saturation is less than 35 percent
Olympic_(soil)
Type of igneous rock body
and its intense bleach, the Spring Gulch chonolith displays a prominent argillic alteration. The estimated age of the Spring Gulch chonolith is about 156
Chonolith
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
Massif in British Columbia, Canada
of 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
Organic-rich bioturbated upper part of the soil
the A-E-SL horizons constitute the biomantle. Since midlatitude type Bt (argillic) horizons are often lacking in tropical soils owing to an abundance of
Soil_biomantle
River in Spain
Plateau incorporates a number of different types of materials, including red argillic soil and a colluvium buildup of gravels with rounded stones of quartz and
Trabancos_(river)
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)
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