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duricrust

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Journal Article
Published: 30 August 2019
Geological Magazine (2020) 157 (2): 307–320.
... were carried out on gold grains from the Minvoul area (Archean greenstone belt in Gabon). Large grains of almost pure gold were found throughout a weathering profile, which consisted of saprolite, mottled clay zone, iron duricrust, pisolitic gravels and yellow latosol. In the deeper horizons, gold...
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Journal Article
Journal: Economic Geology
Published: 01 September 2015
Economic Geology (2015) 110 (6): 1577–1623.
..., whereas the Graauwduinen East orebody comprises a largely unrelated dune deposit. Superimposed onto the ore-bearing sequence is a pseudostratigraphy of duricrust that effectively cemented the bulk of the mineralized sands to various degrees of hardness. The two orebodies are profoundly different in many...
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Journal Article
Published: 17 July 2013
Quarterly Journal of Engineering Geology and Hydrogeology (2013) 46 (3): 259–266.
... environments. Attention is drawn in this article to three near-surface features (duricrusts, palaeolakes and sulphate-rich soils) that reflect changing environmental conditions and that are of potential significance to engineering investigation, design and construction. * (e-mail: Andrew.Hart...
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Journal Article
Journal: Elements
Published: 01 April 2011
Elements (2011) 7 (2): 119–120.
..., but they proved to be quite profitable when mined by open-pit methods. Some ores that originated through surface oxidation are not soft at all but form duricrusts, such as the canga of Brazil. Others are found along unconformities that represent long-vanished paleosurfaces; an example is the Sishen deposit...
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Journal Article
Published: 01 February 2010
Geochemistry: Exploration, Environment, Analysis (2010) 10 (1): 17–26.
...) and overcomes potential pH effects. Improvements in the spatial and amplitude (signal to noise) resolution of this technique compared to total digestion or more aggressive partial digestions is useful not only in areas with exotic cover, but in residual and weathered terrain where duricrust development...
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Journal Article
Published: 01 January 2010
Exploration and Mining Geology (2010) 19 (1-2): 1–12.
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Journal Article
Journal: Economic Geology
Published: 01 March 2008
Economic Geology (2008) 103 (2): 365–386.
... land surface. The ancient hard hematite orebodies comprise laminated hematite ores in which microplaty hematite is dominant, and massive ores composed almost entirely of martite. Supergene ores, in contrast, are comprised of goethite-rich duricrust and soft saprolitic hematite ores representing...
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Journal Article
Published: 01 November 2005
Geochemistry: Exploration, Environment, Analysis (2005) 5 (4): 291–310.
... in deeply weathered terrain. It can be used to test geophysical targets in areas with a preserved lateritic mantle and to explore for pipes that may have obscure geophysical signatures. Orientation studies, using ferruginous gravels and duricrust formed on alkaline ultramafic and ultramafic rocks, show...
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Journal Article
Published: 01 November 2001
Geochemistry: Exploration, Environment, Analysis (2001) 1 (4): 291–306.
... thick. The regolith consists of 50 m-thick saprolite, which is clay-rich in the top 10 m, plasmic and mottled clays, lateritic residuum (duricrusts and gravels) and pisolitic soils; the surficial horizons contain pedogenic carbonates. Elements occurring with primary Au mineralization are S, Ag, W...
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Journal Article
Published: 01 August 2001
Geochemistry: Exploration, Environment, Analysis (2001) 1 (3): 221–236.
... of various ages. Four general types are recognized: ferruginous duricrust and gravel, ferruginous mottles, ferruginous saprolite and iron segregations. Ferruginous duricrusts include lateritic residuum and ferricrete. Lateritic residuum has evolved by partial collapse of mottled or ferruginous regolith...
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Journal Article
Published: 01 September 1997
South African Journal of Geology (1997) 100 (3): 185–194.
...M. E. Marker; M. J. McFarlane Abstract Deeply weathered saprolite beneath duricrusts is diagnostic of the African surface. Detailed cartographic analysis, supported by field investigation, has been applied to the African surface residuals located between Albertinia and Mossel Bay in the southern...
Journal Article
Published: 01 March 1997
Bulletin de la Société Géologique de France (1997) 168 (2): 219–229.
Journal Article
Published: 01 February 1996
Clays and Clay Minerals (1996) 44 (1): 22–31.
Journal Article
Journal: Clay Minerals
Published: 01 June 1994
Clay Minerals (1994) 29 (2): 275–285.
Journal Article
Published: 01 May 1992
Bulletin de la Société Géologique de France (1992) 163 (3): 255–262.
Journal Article
Published: 01 May 1992
Bulletin de la Société Géologique de France (1992) 163 (3): 271–280.
Journal Article
Published: 01 July 1991
Bulletin de la Société Géologique de France (1991) 162 (4): 775–789.
Journal Article
Published: 01 February 1990
Quarterly Journal of Engineering Geology and Hydrogeology (1990) 23 (1): 4–101.
..., Moscow, Vol. 3, 161–190. Aleva, G. J. J. 1979 . Bauxitic and other duricrusts in Suriname: a review. Geol. en Mijnbouw, 58 , 321 – 336 . Alexander, L. T. & Cady, J. G. 1962. Genesis and hardening of laterite in soils. Technical Bulletin 1218, US Department of Agriculture...
Journal Article
Published: 01 November 1989
Bulletin de la Société Géologique de France (1989) V (6): 1217–1225.
... Callovian chemically precipitated rocks Cnidaria Coelenterata Cote-d'Or France duricrust Etrochey Europe France Invertebrata Jurassic Mesozoic Middle Jurassic paleoecology Scleractinia sedimentary petrology sedimentary rocks sedimentary structures Western Europe Zoantharia ...
Journal Article
Published: 01 January 1989
Bulletin de la Société Géologique de France (1989) V (1): 43–53.
... desertification duricrust environment fire geomorphology micromorphology paleosols pedogenesis processes Sahara sedimentary rocks soils terrestrial environment ...