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duricrust

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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
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 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.
...J. P. Garcia; P. Courville; B. Laurin; J. Thierry Anthozoa biodegradation biogenic structures bioherms Callovian chemically precipitated rocks Cnidaria Coelenterata Cote-d'Or France duricrust Etrochey Europe France Invertebrata Jurassic Mesozoic Middle Jurassic paleoecology...
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 ...
Journal Article
Published: 01 January 1981
Bulletin de la Société Géologique de France (1981) S7-XXIII (3): 287-296.
... rocks Coccolithophoraceae Cyclococcolithus dredging duricrust European Atlantic evolution Foraminifera geochemistry geochronology Invertebrata manganese manganese composition metals microfossils nodules North Atlantic paleobotany Plantae Protista Quaternary sedimentary rocks SEM...
Journal Article
Journal: Clay Minerals
Published: 01 March 1980
Clay Minerals (1980) 15 (1): 77-83.
Journal Article
Journal: GSA Bulletin
Published: 01 January 1974
GSA Bulletin (1974) 85 (1): 119-130.
...RANDOLPH W. CHAPMAN Abstract The calcareous duricrust in al-Hasa, Saudi Arabia, covers a rugged topography developed on sandy limestones of Miocens and Pliocene age. It is typically gray or reddish brown and concretionary, and it has been divided into three types: very immature, immature...