Hydromorph

Gueniot B, Munier-Lamy C, Berthelin J (1988b) Geochemical behavior of Uranium in soils, part 11 Distribution of uranium in hydromorphic soils and soil sequences. Application for suificial prospecting. J Geochem Explor 31 39-55... 

Fig. 1. Distribution of Hg (and Cd) in till at the MFN deposit. DDH MF00-31 and DDH MF00-29 are marked with an X subcropping mineralization is marked by a dashed line. Arrows indicate ice flow directions, the youngest flow was northeastward, elements by electrochemical mechanisms and hydromorphic dispersal. These conclusions are supported by qualitative mass balance calculations and variable geochemical distribution patterns in till, in the context of local and regional ice flow.

Kovda, V. A. (1973). Hydromorphic soils of Mediterranean and Tropic areas. In Pseudoglay and Glay. Weinheim Verl. Chem., pp. 379-382. 

Brinkman R. 1970. Ferrolysis, a hydromorphic soil forming process. Geoderma 3 199-206. 

Brinkman R. 1977a. Problem hydromorphic soils in north-east Thailand. 2. Physical and chemical aspects, mineralogy and genesis. Netherlands Journal of Agricultural Science 25 170-180. 

KEYWORDS uranium, aqueous chemistry, redox equiiibria, radon, hydromorphic dispersion... 

Alteration assemblages may include primary chlorite, illite, smectites, and/or kaolinite, and various primary and secondary iron oxides, carbonates, and sulfides (Fig.1), any one of which may serve as indicators of fluid composition. Lithologic geochemical surveys rely on an understanding of these patterns to vector towards uranium deposits. The interpretation of hydromorphic geochemical surveys, including lake and stream sediment, and soil, depends on the mobility of uranium and associated elements in the surface and near surface environment. 

Fig. 16.9 Electron micrographs of soil lepidocro-cite. a) Large multidomainic lath-like crystal viewed perpendicularto [001] with laminar pores from a re-doximorphic soil, Natal, South Africa, b) Poorly crystalline grassy lepidocrocite crystals mixed with tiny ferrihydrite particles and pseudo-hexagonal kaolinite platelets. Origin as before (a. b courtesy P. Self), c) Small lepidocrocite crystal from a hydromorphic soil (with ferrihydrite) viewed perpendicularto [001] and showing (020) lattice fringes (see also Schwert-mann. Taylor, 1989,with permission).

Bourrie, G. Trolard, F. Jaffrezic, J.-M. R.G.-A. Maitre,V. Abdelmoula, M. (1999) Iron control by equilibria between hydroxy-Green Rusts and solutions in hydromorphic soils. Geochim. Cosmochim. Acta 63 3417-3427 Bousse, L. Meindl, J.D. (1986) The importance of > /o/pH characteristics in the theory of the oxide/electrolyte interface. In Davis, J.A. Hayes, KF. (eds.) Geochemical processes... 

I Brand Name(s) Dilaudid, Dilaudid-5, Dilaudid HP, Hydromorph, Hydrostat IR Chemical Class Opiate derivative phenanthrene derivative... 

G6nin, J.-M.R., Bourne, G., Trolard, F. el al. (1998) Thermodynamic equilibria in aqueous suspensions of synthetic and natural Fe(II)-Fe(III) green rusts occurrences of the mineral in hydromorphic soils. Environmental Science and Technology, 32(8), 1058-68. 

Selective leach techniques have become popular in mineral exploration for the treatment of geochemical soil samples. Their popularity stems from the fact that they are considered to extract selectively a particular hydromorphically-transported component of metals in the sample and, as such, show better anomaly-to-background contrasts than do conventional strong acid digestions which dissolve most of the chemical matrix of the soil. 

The rationale for using Hg as a pathfinder element in mineral exploration is attractive. Because of its volatility, Hg is presumed to form broader halos in the hypogene environment than most elements. It is envisaged that both vapour-phase and solution transport are responsible for a wide dispersion of the element. In the secondary environment it is well known that Hg exerts a measurable vapour pressure at ambient temperatures and possesses redox properties that allow the metal to exist in the elemental state under a range of natural conditions. Therefore it has been claimed that, as a host sulphide-body weathers, it can be expected that Hg will be converted partly to the vapour state, thereby overcoming the constraint of hydromorphic or solution dispersion that applies to other target and indicator elements. Vapour-phase dispersion through permeable rock or cover would allow Hg to be detected in soil or soil gas, and perhaps as an atmospheric anomaly. 

Figure 2.1 Settings for calcrete development. In fluvial settings pedogenic calcretes can develop on floodplains and terraces, whereas groundwater calcretes may form in channel deposits or around the capillary fringe and upper part of the phreatic zone in more permeable parts of the floodplain. In alluvial fans paired calcretes may develop on the fans, with hydromorphic calcretes near discharge zones.

Above the mean water level, the palustrine environment begins it can include peats, calcareous marsh and ponds (Figure 9.3B, C), and hydromorphic (pseudogley) soils depending on the nature of the morphoclimatic setting. 

Hydromorphic. Developed under conditions of excess moisture. Hydro-morphic soils are found under conditions of poor drainage in marshes, swamps, seepage areas, or flats. 

Figure 39. Secondary amorphous accumulation of SiOs in hydromorphic. toils in Mangroves ecosystems of Senegal, West Africa (Kovda, I9S4).

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