Radiation-damage rims in quartz from uranium-bearing sandstones

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Properties of Rocks and Soils 9O5022 Geotechnicai study of the north and northwest coast of the Arabian Gulf Saeedy, H S; Mollah, M A Engng Geol V28, Nl,:2. Feb 1990, P27-40 Soil conditions in southern Iraq (region I) and northern Kuwait (region 2) were investigated. Extensive SPTs were made and samples taken for laboratory studies of classification and index properties, strength and compressibility. Chemical analyses were undertaken to identify soils potentially damaging to concrete. Region 1 has a surface layer of deep soft clay except where Dibdibba sand and gravel outcrop. Region 2 consists of windblown sand over silty sand. sometimes calcareous. Broad recommendations for foundation design are given.

Composition, structure texture and density See also: 905226 905023 Applications of fluorescence microscopy to study of pores in tight rocks Soeder, D J Bull Am Soc Petrol Geoi V74, N1. Jan 1990, P30-40 Low permeability gas reservoirs, such as coal, shale, or tight sandstone, are often characterised by pores which are smaller than 1 micron and/or linear in shape. These are difficult to observe on traditional stained impregnated thin sections. This difficulty can be overcome by adding fluorescent Rhodamine B to the usual dye, and using an incident light microscope equipped for epifluorescence. This technique is suitable for any material with small, narrow or linear pores. 9O5O24 Generalized calibration of a nuclear moisture/density depth gauge Morris, P H; Williams. D J Geotech Test g VI3, N1. March 1990, P24-35 For very soft variable deposits such as coal tailings, it is not possible to calibrate nuclear moisture/density depth gauges by direct correlation with measured properties. A generalised calibration is developed from first principles, based on the elemental composition of the soil under test. As moisture content has a direct influence on the elemental composition, an iterative process is required for calculation. Reasonably reliable calibrations have been derived for two access tubes. 905O25 Radiation-damage Hms in quartz from uranium-bearing sandstones Meunier, J D; Sellier, E; Pagel, M J Sediment Petrol 1/60, NI. Jan 1990. P53-58 Using the scanning electron microscope in the cathodoluminescence (CL) mode, radiation damage in quartz is made visible in uranium-vanadium bearing sandstones. Three concentric rims, caused by alpha particles, are seen which are similar to those observed by other workers. Implications of the presence of these rims is discussed in terms of their use in uranium exploration and to indicate areas from which original uranium has been leached out.

905026 Determination of the strain ellipsoid from sectional data De Paor. D G J Struct Geol VI2, NI, Jan 1990. P131-137 A new method is presented to determine the shape and orientation of the triaxial strain ellipsoid, given sectional data from at least 3 arbitrary planes. By examining a set of coaxial test planes, the triaxial strain state can be revealed. The simple solution is readily understood. Results can be calculated manually, but a set of computer programs is available to speed calculation. 905027 Automated two-dimensional strain analysis from deformed elfiptical markers using an image analysis system. Microcomputer techniques and applications Kanagawa. K J Struct Geol VI2, N1, Jan 1990, P139-143 The application of image analysis techniques to automated data collection from deformed elliptical markers is illustrated. Best fit ellipses are calculated for individual markers, and their axial ratios and long axis orientations used in strain calculations. Precision of data is discussed. Examples of its use are presented and results compared with those obtained manually. Application of this computer technique allows rapid and precise finite strain analysis. 9O5O28 Petrophysical investigations on core samples of the KTB Nover, G; Buntebarth, G; Kern, H; Pohl, I: Pusch, G; Schopper, J R; Schult. A; Will, G Sci Drilling VI. N3. 1989. P135-142 Seismic velocity, thermal conductivity, density, porosity, magnetic susceptibility, electrical conductivity, and zeta potential were measured on cores from the Continental Deep Drilling (KTB) Project pilot hole. The parameters are anisotropic due to the texture and foliation of the gneissic rocks. Experimental results are discussed with reference to test conditions of temperature and pressure and in situ conditions. 905029 Density prediction using a static cone penetrometer Baghdadi, Z A; Ghazali, F M; Khan, A M Proc 1st International Symposium o n Penetration Testing, ISOPT-I, Orlando,20-24 March 1988 V2, P635-641. Publ Rotterdam." A A Balkema, 1988 Since cohesionless soils cannot be sampled without affecting their state, insitu measurements of densities are necessary. Investigations were carried out to analyse the use of a static cone penetrometer for predicting densities of two air dried granular soils. The penetrometer used was a static cone penetrometer, a modification of the Vicksberg penetrometer. The penetration resistances of soil specimens prepared at specific densities were measured and then analysed by linear regression for correlations with surcharge loads and penetration depth. Test details and results are presented. 9O5O3O A critical appraisal of CPT calibration chamber tests Been, K; Crooks, J H A; Rothenburg, L Proc 1st International Symposium on Penetratwn Testing, ISOPT-I, Orlando,20-24 March 1988 V2, P651-660. Publ Rotterdam: A A Balkema, 1988 Calibration chamber tests are used to develop correlations between cone penetration resistance and sand density or engineering properties. A case history is identified where this approach may be misleading. The assumptions inherent in the

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