Sediment clay-rich

Hoch M, Alonso-Azcarate J, Lischick M (2003) Assessment of adsorption behaviour of dibutyltin (DBT) to clay-rich sediments in comparison to the highly toxic tributyltin (TBT). Environmental Pollution, 123(2) 217-227. 

Lithium isotope studies of sediments and sedimentary rocks have thus far concentrated on marine clastic and carbonate material. No systematic description of the effects of diagenetic processes on sediments has been made. Clay rich sediments are important to Li budgets in near-surface systems, as they concentrate Li relative to marine carbonates, which are among... 

Irregular/nodular Carbonates or clay-rich sediments Host features preserved, simple micromorphology illuvial features absent Related to karst circulation or water table fluctuation temperate-tropical... 

An important study by Cullers et al. (1987), on the effect of sedimentary sorting on REE concentrations, found that the REE pattern of the source was most faithfully represented in the clay-sized fraction of the sediment. Qay-bearing rocks also have a much higher concentration of total REE than other sediments. It is for this reason that many authors have used the REE content of the clay portion of a sediment or clay-rich sediments in order to publish the sedimentary processes and to identify the provenance. The presence of quartz has a diluting effect on REE concentrations, as does carbonate. The presence of heavy minerals, particularly zircon, monazite and allanite, may have a significant but erratic effect on the REE pattern of an individual sample. 

---