2.3 KiB
| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Argillic | 2/2 | https://en.wikipedia.org/wiki/Argillic | reference | science, encyclopedia | 2026-05-05T09:08:42.024958+00:00 | kb-cron |
Translocation by eluviation The eluviation (downward movement) of clay particles through the soil by physical means (ie. water movement). Where the clay particles originate is termed the "zone of eluviation" and the "zone of illuviation" is the part of the horizon in which the clay particles move to. The argillic horizon is synonymous with the zone of illuviation. Translocation by eolian (wind) processes Previously existing clays are transported into new environments through wind and accumulate on the surface. Weathering in-situ Chemical and physical weathering both cause the reduction of particles into clay sized pieces (smaller than 2 micrometers). Neoformation (synthesis in solution) Clay minerals are precipitated in solution or formed by the alteration of amorphous (non-crystalline) minerals.
=== Clay mineralogy === There are seven clay primary mineral groups, all of which are silicates. Within these, clays fall under a variety of geometries including tetrahedral, octahedral, cubic, and dodecahedral. These geometries are then layered with different minerals between them contributing to the mineralogical properties. The type of clay formed in the pedogenesis of argillic horizons is dependent on the initial mineral availability and diversity in the parent material, as well as the pH of the soil, and the Eh of the soil. Eh is the potential for redoximorphic reactions to occur in soil and is measured by the voltage in the soil.
== References ==
== Further reading == Bockheim, J.G.; Hartemink, A.E. (November 2013). "Distribution and classification of soils with clay-enriched horizons in the USA". Geoderma. 209–210: 153–160. Bibcode:2013Geode.209..153B. doi:10.1016/j.geoderma.2013.06.009. Nettleton, W. D.; Flach, K. W.; Brasher, B. R. (January 1969). "Argillic Horizons Without Clay Skins". Soil Science Society of America Journal. 33 (1): 121–125. Bibcode:1969SSASJ..33..121N. doi:10.2136/sssaj1969.03615995003300010032x. Hedenquist, Jeffrey W.; Arribas, Antonio (May 2022). "Exploration Implications of Multiple Formation Environments of Advanced Argillic Minerals". Economic Geology. 117 (3): 609–643. Bibcode:2022EcGeo.117..609H. doi:10.5382/econgeo.4880.