duricrust


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duricrust

[′du̇r·ə‚krəst]
(geology)
The case-hardened soil crust formed in semiarid climates by precipitation of salts; contains aluminous, ferruginous, siliceous, and calcareous material.
References in periodicals archive ?
The surficial deposit includes unconsolidated iron rich eluvial material as well as a ferruginous duricrust or "hard cap" of which the latter is composed of primarily hematite and goethite with a thickness varying up to 13 metres.
Outcrop in the area occurs mostly as laterite duricrust or lateritised outcrops; a total of 278 sample analyses have now been received from the rock chip (ASX releases of 6 May 2010 and 11 June 2010).
The intact lateritic profile was mostly formed by weathering of granitoids and other rock types and these profiles commonly consist of sand and pisolitic gravels over lateritic duricrust (cemented ferruginous material), mottled and pallid zones (quartz and clay rich materials), saprolite and saprock (isovolumetrically weathered materials with retention of parent rock fabric), and rock (Anand and Paine 2002).
lateritic duricrust Boreholes URC013 to URC018 were drilled in the western part of the prospect.
Detailed mapping and reconnaissance work completed by the Company at Area 1 in January 2013 defined BIF outcrop and BIF fragments in duricrust over a strike length of 3.
Laterisation refers to the in-situ formation of an Fe-rich duricrust capping a deep weathering profile (Tardy 1992).
Iron oxide cemented materials (Zh) are usually removed during bauxite mining and constitute the duricrust and friable zones (Fig.
Recent detailed mapping and reconnaissance work has been undertaken by the Company at Area 1 and has defined BIF outcrop and Banded Iron Formation ('BIF') fragments in duricrust over a strike length of 3.
Atlhopheng JR, Ekosse GE (2007) Mineralogical appraisal of sediments of duricrust suites and pans around Jwaneng Area, Botswana.
Anand RR, Gilkes RJ (1987) Variation in the properties of iron oxides within individual specimens of lateritic duricrust.
Significant gold assays were also intersected within the upper 5 to 10 meters of the oxide zone within enriched lateritic duricrust and mottled saprolite.
The soil of this work was formed by colluvial materials containing hematite-rich duricrust fragments (nodules).