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hardpans

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.... The glass of australites found in situ is dulled, but the structures are sharp, showing that little movement has occurred. No australite has been found in or below the hardpan of the humus podsol. Seven radiocarbon datings were made of fossil hardpan material, of charcoal at various levels above...
Series: Geological Society, London, Special Publications
Published: 01 January 2000
DOI: 10.1144/GSL.SP.2000.180.01.26
EISBN: 9781862394285
... and calcrete, with this example interpreted to have formed entirely within a semi-arid environment. Karst cavities were developed in a mature hardpan calcrete, generated in sandy fluvial sediments with associated aeolian deposits. Subsequent to karst cavity generation, clasts derived from the subaerially...
FIGURES | View All (12)
Journal Article
Published: 01 December 1990
Canadian Journal of Earth Sciences (1990) 27 (12): 1686-1698.
... and mottled clays, ( ii ) iron hardpan, ( iii ) iron cuirasse, and ( iv ) eluvium. Mineralogical analyses reveal that the laterite is dominated by kaolinite, goethite, quartz, mica, and hematite. The mean chemical composition is 46% SiO 2 , 22% Al 2 O 3 , 20% Fe 2 O 3 , 1% TiO 2 , 1% K 2 O, 0.05% CaO 2...
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SECONDARY SULFATE AND Fe(III) OXYHYDROXIDE MINERALS OBSERVED IN THE <b>HARDPAN</b>...
Published: 01 September 2015
TABLE 2. SECONDARY SULFATE AND Fe(III) OXYHYDROXIDE MINERALS OBSERVED IN THE HARDPAN LAYERS *
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A thin white layer composed mainly of gypsum covering an iron <b>hardpan</b> on to...
in > Elements
Published: 01 April 2012
A thin white layer composed mainly of gypsum covering an iron hardpan on top of a tailings pile
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( A ) Iron <b>hardpan</b>–covered surface of a closed tailings impoundment in the ...
in > Elements
Published: 01 April 2012
F igure 5 ( A ) Iron hardpan–covered surface of a closed tailings impoundment in the Shizishan Cu–Au mine, Tongling, eastern China. ( B , C , D ) False-color micro-X-ray fluorescence maps showing the qualitative distribution of As(III), As(V), and Fe(III) in an Fe oxyhydroxide particle
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Scheme showing the formation process of the <b>hardpan</b> in column A. Note that ...
Published: 01 November 2007
F igure 12. Scheme showing the formation process of the hardpan in column A. Note that the hardpan is a neoformed continuous level with porosity practically nil.
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Photo of the <b>hardpan</b> calcrete at the base of the Upper Shale Member of the ...
Published: 01 March 2007
Figure 10 Photo of the hardpan calcrete at the base of the Upper Shale Member of the Cedar Mountain Formation. Our work suggests that this mature paleosol represents the sequence boundary between the Middle–Upper Jurassic and Lower Cretaceous tectonostratigraphic units of the Western Interior
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General appearance of red–brown <b>hardpan</b> with clay glaebules impregnated by ...
Published: 01 July 2006
Fig. 15.  General appearance of red–brown hardpan with clay glaebules impregnated by opal. Illuviation structures of clay, iron oxides and silica at the base of voids. In places, calcite is final cement. Larkins Folly field, Coober Pedy.
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Geotropic disposition of opal concretions in red–brown <b>hardpan</b>. Opal cutans...
Published: 01 July 2006
Fig. 16.  Geotropic disposition of opal concretions in red–brown hardpan. Opal cutans coat gravels and glaebules at base of voids and alternating with clay cutans and granule accumulations. Sequence can be repeated. Larkins Folly field, Coober Pedy.
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Geotropic disposition of opal concretions in red–brown <b>hardpan</b>. Silica conc...
Published: 01 July 2006
Fig. 17.  Geotropic disposition of opal concretions in red–brown hardpan. Silica concretions can exhibit asymmetry between top and base of voids as a result of movement of percolating solutions in the zone above the water table. Emu field, Coober Pedy.
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Contact between the groundwater calcrete <b>hardpan</b> and the overlying Bonavent...
Published: 18 October 2002
Fig. 9. Contact between the groundwater calcrete hardpan and the overlying Bonaventure Formation in the Saint-Jules quarry.
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Calcrete <b>hardpan</b> parallel to cross-laminae in a thick tabular cross-bedded ...
Published: 29 November 2000
Fig. 11. Calcrete hardpan parallel to cross-laminae in a thick tabular cross-bedded unit.
Journal Article
Published: 19 December 2009
Canadian Journal of Earth Sciences (2009) 46 (12): 939-947.
... reprecipitation of part of the parent iron, silica, and aluminum. The reprecipitation led to the formation of a debris mantle sometimes overlain by iron, aluminum, or magnesium hardpan layers. This configuration makes it difficult to trace the parent signatures of the primary mineralizations and to locate...
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Journal Article
Published: 01 March 2000
Bulletin of Canadian Petroleum Geology (2000) 48 (1): 1-18.
... maturity than to high soil alkalinity, the amount of sediment delivered during pedogenesis and the effects of exposure to both meteoric and phreatic conditions during shallow burial. At the top of the section, shallow marine shales are capped by a brecciated calcrete-dolocrete hardpan that represent...
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Journal Article
Published: 07 March 2017
Journal of the Geological Society (2017) 174 (4): 646-654.
...Pierre Jutras Abstract The Galdrings cliffs of Machrihanish, in the Kintyre Peninsula of Scotland, expose a Lower Carboniferous clastic succession that hosts a wide variety of calcretes, including thick and massive host-replacing phreatic calcrete hardpans (HRPCHs), which are geologically rare...
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Journal Article
Journal: Clay Minerals
Published: 01 June 2014
Clay Minerals (2014) 49 (3): 473-494.
... of the Kızılırmak Formation (Late Miocene-Pliocene). The calcretes occur in the form of nodules, tubes, fracture-infills, and hard laminated crusts (hardpans). Calcrete samples are predominantly composed of calcite associated with smectite, quartz, feldspar, and minor palygorskite. The lacustrine mudstone samples...
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Journal Article
Journal: Geology
Published: 01 February 2011
Geology (2011) 39 (2): 147-150.
...Pierre Jutras; Grant M. Young; W. Glen E. Caldwell Abstract Because it is partly masked by a phreatic calcrete hardpan (PCH), a rare and poorly known type of rock that can transgress stratigraphic boundaries, there has been ongoing controversy concerning the exact position of James Hutton's first...
FIGURES
Journal Article
Published: 01 April 2008
Clays and Clay Minerals (2008) 56 (2): 244-258.
...Selahattin Kadir; Muhsin Eren Abstract Caliche in various forms, namely powdery, nodule, tube, fracture-infill, laminar crust, hard laminated crust (hardpan), and pisolitic crust, is widespread in the Mersin area in southern Turkey. It generally occurs within and/or over the reddish-brown mudstone...
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Journal Article
Published: 01 November 2007
American Mineralogist (2007) 92 (11-12): 1966-1977.
...F igure 12. Scheme showing the formation process of the hardpan in column A. Note that the hardpan is a neoformed continuous level with porosity practically nil. ...
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