caliche

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  • noun

Synonyms for caliche

crust or layer of hard subsoil encrusted with calcium-carbonate occurring in arid or semiarid regions

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nitrate-bearing rock or gravel of the sodium nitrate deposits of Chile and Peru

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References in periodicals archive ?
Searle (1985), "Distribution of Calcrete in Holocene Coastal Sands in Relationship to Climate, Southwestern Australia," Journal of Sedimentary Research 55, 86-95.
The Barns calcrete geochemical anomaly, together with an aerial photo of the prospect, is shown on Figure 2.
Paleocene lignite related sandstones and calcretes in the adjacent Thar Desert are likely the hosts for leachable uranium.
Estas facies en muchas partes y en ambos lados de la quebrada, se alternan con depositos de calcrete de conglomerado (Khadkikar, 1999), los cuales forman como especies de acantilados que sobresalen por ser mas resistentes a la erosion.
Uranium mineralisation has been detected both in calcrete and alaskite rocks.
Calcrete layers are evident in the swales in the sand plains, and in some areas of Winton Formation outcrop, e.
Na Zona de Baixa Restricao encontram-se as estruturas rochosas praticamente impermeaveis como os aquicludes e aquitardes da Formacao Santa Maria Membro Alemoa, constituida por rochas sedimentares de cor avermelhada, sem textura, de carater argiloso a siltico (lamito) com pequena ocorrencia de depositos de caliche e calcrete (concrecoes calcarias).
Both of these mountains form impressive topographic landmarks that can be seen from many kilometers away, rising high above the surrounding Namib Desert calcrete plains.
Its origin is uncertain but may represent the degraded and weathered calcrete core of a fossil dune.
The leach solution is then partially neutralised, using 1 Mt/y of calcrete slurry, and feeds to the hydrogen sulphide (35,000 t/y) precipitation unit where nickel, cobalt and some impurities are precipitated as a mixed sulphide filter cake.
Between the dunes are the vlei (dry calcrete pans) each with a crust of mineral mud crazed into attractive mosaics.
Most of the materials dated were calcrete with some organic carbon and/or shell fragments (Thomas and Shaw 1991).
It is likely that further commercially viable diamond pipes will eventually be located, although prospecting is hampered by the Kalahari sand, and calcrete layer which covers much of Botswana.
The presence of calcitc in some of the coarse fractions of the soils and calcrete observed in the field, coupled with the low Ca and Mg contents of the local groundwater (Smedley 2004), suggest that plant availability of these elements may be poor.