polymictic


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polymictic

[¦päl·i¦mik·tik]
(hydrology)
Pertaining to or characteristic of a lake having no stabile thermal stratification.
(petrology)
Of a clastic sedimentary rock, being made up of many rock types or of more than one mineral species.
References in periodicals archive ?
The aims of this study were (1) to review the spring zooplankton versus autumn zooplankton of a shallow polymictic lake; (2) to assess how much the zooplankton of the transition seasons, i.
The basin is underlain by Clarkie Formation epiclastic rocks; greywacke, siltstone, polymictic conglomerate and iron formation.
Therefore, the analysis focused on the identification of altered components on the surface of the grains and the general geochemical classification of fragments, which may indicate either an origin from a common source or a polymictic character of the bulk of the ash.
The most characteristic feature of the Cisna Beds is the occurrence of grey (grey-brown on weathered surfaces), thick-bedded (even more than 3m), fine-to coarse-grained, polymictic sandstones with calcareous-siliceous cement (so-called Cisna-type sandstones).
This influence might occur especially in Lake Chapala, which is a shallow, polymictic, and turbid lake where suspended montmorillonite clays may enhance conditions for the bacteria by providing a surface for the adsorption, photodegradation, and desorption of dissolved organic carbon (Tietjen et al.
Conglomerate is commonly polymictic, displaying subangular, sub-rounded and angular clasts up to 8 cm across of local basement rock lithologies; granodiorite, diorite, and quartzite are especially common.
The water column is frequently mixed and the lakes are therefore referred to as polymictic.
The Fuenteobejuna section is 140 m thick, mostly composed of limestones, shales and polymictic breccias in the upper part.
Water temperature of the lake followed air temperature rather closely, the circulation pattern was continuum warm polymictic, and no thermal stratification was recorded.
Two small, shallow and polymictic reservoirs near to Curitiba city (Parana State, Brazil), were studied.