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  • 1
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    Applications of X-ray Computed Tomography in the Geosciences (2003)
    London : The Geological Society
    Details
    Keywords: computer tomography; X-ray analysis
    Description / Table of Contents: Applications of X-ray computed tomography in the geosciences / F. Mees, R. Swennen, M. Van Geet and P. Jacobs / Geological Society, London, Special Publications, 215, 1-6, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.01 --- Applications of high-resolution X-ray computed tomography in petrology, meteoritics and palaeontology / W. D. Carlson, T. Rowe, R. A. Ketcham and M. W. Colbert / Geological Society, London, Special Publications, 215, 7-22, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.02 --- Computed tomography in petroleum engineering research / S. Akin and A. R. Kovscek / Geological Society, London, Special Publications, 215, 23-38, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.03 --- Study of the microgeometry of porous materials using synchrotron computed microtomography / K. W. Jones, H. Feng, W. B. Lindquist, P. M. Adler, J. F. Thovert, B. Vekemans, L. Vincze, I. Szaloki, R. Van Grieken, F. Adams and C. Riekel / Geological Society, London, Special Publications, 215, 39-49, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.04 --- Porosity measurements of sedimentary rocks by means of microfocus X-ray computed tomography (μCT) / M. Van Geet, D. Lagrou and R. Swennen / Geological Society, London, Special Publications, 215, 51-60, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.05 --- Quantitative characterization of fracture apertures using microfocus computed tomography / K. Vandersteen, B. Busselen, K. Van Den Abeele and J. Carmeliet / Geological Society, London, Special Publications, 215, 61-68, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.06 --- Three-dimensional visualization of fractures in rock test samples, simulating deep level mining excavations, using X-ray computed tomography / E. Sellers, A. Vervoort and J. Van Cleynenbreugel / Geological Society, London, Special Publications, 215, 69-80, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.07 --- Geostatistics and the representative elementary volume of gamma ray tomography attenuation in rock cores / J. R. Vogel and G. O. Brown / Geological Society, London, Special Publications, 215, 81-93, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.08 --- Porosity and fluid flow characterization of granite by capillary wetting using X-ray computed tomography / Y. Géraud, F. Surma and F. Mazerolle / Geological Society, London, Special Publications, 215, 95-105, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.09 --- Direct imaging of fluid flow in fault-related rocks by X-ray CT / T. Hirono, M. Takahashi and S. Nakashima / Geological Society, London, Special Publications, 215, 107-115, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.10 --- Rock drying tests monitored by X-ray computed tomography — the effect of saturation methods on drying behaviour / B. Rousset-Tournier, F. Mazerolle, Y. Géraud and D. Jeannette / Geological Society, London, Special Publications, 215, 117-125, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.11 --- Characterization by X-ray computed tomography of water absorption in a limestone used as building stone in the Oviedo Cathedral (Spain) / V. G. Ruiz de Argandoña, A. Rodriguez-Rey, C. Celorio, L. Calleja and L. M. Suárez del Rio / Geological Society, London, Special Publications, 215, 127-134, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.12 --- Estimation of porosity and hydraulic conductivity from X-ray CT-measured solute breakthrough / S. H. Anderson, H. Wang, R. L. Peyton and C. J. Gantzer / Geological Society, London, Special Publications, 215, 135-149, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.13 --- Assessment of soil structure using X-ray computed tomography / H. Rogasik, I. Onasch, J. Brunotte, D. Jegou and O. Wendroth / Geological Society, London, Special Publications, 215, 151-165, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.14 --- 3D soil image characterization applied to hydraulic properties computation / J. F. Delerue, E. Perrier, A. Timmerman and R. Swennen / Geological Society, London, Special Publications, 215, 167-176, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.15 --- Evaluation of local porosity changes in limestone samples under triaxial stress field by using X-ray computed tomography / C. O. Karacan, A. S. Grader and P. M. Halleck / Geological Society, London, Special Publications, 215, 177-189, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.16 --- Monitoring void ratio redistribution during continuous undrained triaxial compression by X-ray computed tomography / P. R. Thomson and R. C. K. Wong / Geological Society, London, Special Publications, 215, 191-198, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.17 --- The use of X-ray computed tomography in the investigation of the settlement behaviour of compacted mudrock / M. A. O’Neill, A. K. Goodwin and W. F. Anderson / Geological Society, London, Special Publications, 215, 199-204, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.18 --- Industrial X-ray computed tomography studies of lake sediment drill cores / A. Flisch and A. Becker / Geological Society, London, Special Publications, 215, 205-212, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.19 --- Analysis of analogue models by helical X-ray computed tomography / G. Schreurs, R. Hänni, M. Panien and P. Vock / Geological Society, London, Special Publications, 215, 213-223, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.20 --- Preliminary microfocus X-ray computed tomography survey of echinoid fossil microstructure / S. R. Stock and A. Veis / Geological Society, London, Special Publications, 215, 225-235, 1 January 2003, https://doi.org/10.1144/GSL.SP.2003.215.01.21
    Pages: Online-Ressource (243 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781862394636
    URL: https://sp.lyellcollection.org/content/215/1
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Paragenesis of Cretaceous to Eocene carbonate reservoirs in the Ionian fold and thrust belt (Albania): relation between tectonism and fluid flow (2002)
    Oxford, UK : Blackwell Science Ltd
    Sedimentology 49 (2002), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: This paper examines the diagenetic history of dual (i.e. matrix and fracture) porosity reservoir lithologies in Cretaceous to Eocene carbonate turbidites of the Ionian fold and thrust belt, close to the oil-producing centre of Fier–Ballsh (central Albania). The first major diagenetic event controlling reservoir quality was early cementation by isopachous and syntaxial low-Mg calcite. These cements formed primarily around crinoid and rudist fragments, which acted as nucleation sites. In sediments in which these bioclasts are the major rock constituent, this cement can make up 30% of the rock volume, resulting in low effective porosity. In strata in which these bioclasts are mixed with reworkedmicrite, isopachous/syntaxial cements stabilized the framework, and matrixporosity is around 15%. The volumetric importance of these cements, their optical and luminescence character (distribution and dull orange luminescence) and stable isotopic signal (δ18O and δ13C averaging respectively; −0·5‰ VPDB and +2‰ VPDB) all support a marine phreatic origin. Within these turbidites and debris flows, several generations of fractures alternated with episodes of cementation. A detailed reconstruction of this history was based on cross-cutting relationships of fractures and compactional and layer-parallel shortening (LPS) stylolites. The prefolding calcite veins possess orange cathodoluminescence similar to that of the host rock. Their stable isotope signatures (δ18O of −3·86 to −0·85‰ VPDB and δ13C of – 0·14 to + 2·98‰ VPDB) support a closed diagenetic rock-buffered system. A similar closed system accounts for the selectively reopened and subsequently calcite-cemented LPS stylolites (δ18O of −1·81 to −1·14‰ VPDB and δ13C of +1·52 to +2·56‰ VPDB). Within the prefolding veins, brecciated host rock fragments and complex textures such as crack and seal features resulted from hydraulic fracturing. They reflect expulsion of overpressured fluids within the footwall of the frontal thrusts. After folding and thrust sheet emplacement, some calcite veins are still rock buffered (δ18O of −0·96 to +0·2‰ VPDB and δ13C of +0·79 to +1·37‰ VPDB), whereas others reflect external (i.e. extraformational) and thus large-scale fluid fluxes. Some of these veins are linked to basement-derived fluid circulation or originated from fluid flow along evaporitic décollement horizons (δ18O around +3·0‰ VPDB and δ13C around +1·5‰ VPDB). Others are related to the maturation of hydrocarbons in the system (δ18O around −7·1‰ VPDB and δ13C around +9·3‰ VPDB). An open joint system reflecting an extensional stress regime developed during or after the final folding stage. This joint system enhanced vertical connectivity. This open joint network can be explained by the high palaeotopographical position and the folding of the reservoir analogue within the deformational front. The joint system is pre-Burdigalian in age based upon a dated karstified discordance contact. Sediment-filled karst cavity development is linked to meteoric water infiltration during emergence of some of the structures. Despite its sediment fill, the karst network is locally an important contributor to reservoir matrix porosity in otherwise tight lithologies. Development of secondary porosity along bed-parallel and bed-perpendicular (i.e. layer-parallel shortening) stylolites is interpreted as a late-stage diagenetic event associated with migration of acidic fluids during hydrocarbon maturation. Development of porosity along the LPS system enhanced the vertical reservoir connectivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3091.2002.00476.x
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  • 3
    Electronic Resource
    Electronic Resource
    Spheroidal dolomites in a Visean karst system – bacterial Induced origin? (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 44 (1997), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Spheroidal dolomite crystals occur in the karstified top of a Dinantian dolomite sequence in eastern Belgium. The spheroidal dolomite crystals are best developed at the base of the karst system. The dolomite crystals are characterized by a spherulitic or dumb-bell inclusion pattern, and are overgrown by dolomite cements with a rhombohedral outline. They are considered to be bacterially related precipitates based on, (1) textural similarities with documented bacteriogenic precipitates, (2) the presence of ‘bacterial’microspheres and framboidal pyrite embedded within the dolomite, and (3) their general geological setting. The geochemical characteristics of the dolomites and associated minerals support a bacterial origin. The ubiquity of framboidal pyrite, depleted in 34S (δ34S=— 22.4 to — 25.5%oCDT), testifies to a period of bacterial sulphate reduction. The isotopic composition of the spheroidal dolomites (δ13C=— 2.4 to - 3.2%oPDB and δ18O=— 3.8 to - 3.4%oPDB) suggest a contribution from oxidized organic carbon produced during bacterial sulphate reduction. Sulphate reduction may also result in a concomitant 18O depletion if the system is nearly closed. It is however, evident from the sulphur isotopic composition of associated framboidal pyrite that the system was fairly open. The 18O depletion of the spheroidal dolomite crystals (δ18O=— 3.8 to — 3.4%oPDB) and their occurrence adjacent to, and within karst cavities suggests a mixing zone origin, with a significant proportion of freshwater in it. The rhombohedral cement-overgrowths have calculated δ18O values in the range of 0 to +5.3%oPDB, which reflect precipitation from normal to slightly evaporated contemporaneous seawater.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1997.tb00431.x
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  • 4
    Electronic Resource
    Electronic Resource
    Origin of Dinantian zebra dolomites south of the Brabant-Wales Massif, Belgium (1998)
    Oxford UK : Blackwell Science Ltd
    Sedimentology 45 (1998), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Zebra dolomites, characterized by a repetition of dark grey (a) and light (b) coloured dolomite sheets building up abbabba-sequences, occur in Dinantian strata from deep boreholes (〉 2000 m) south of the Brabant-Wales Massif in Belgium. These zebra dolomite sequences are several tens of metres thick. The dark grey dolomite sheets (a) consist of non-planar crystals, 80–150 μm in diameter. These crystals display a mottled red–orange luminescence and are interpreted to be replacive in origin. The white dolomite sheets (b) consist of coarse crystalline nonplanar b1 dolomite, which evolves outwards into transparent saddle shaped b2 dolomite. The b1 dolomites possess a mottled red–orange luminescence similar to the a dolomites, while the saddle shaped b2 rims display red to dark brown luminescent-zones. The b1 dolomites are possibly partly replacive and partly cavity filling. Their b2 rims display criteria typical for a cement origin. Locally, cavities exist between two succeeding white dolomite sheets. These cavities make up ≈5% of the zebra rocks and are locally filled by saddle shaped ankerite and/or xenomorphic ferroan calcite.Geochemical and fluid inclusion data (Th ≈ 120 °C) indicate a burial diagenetic origin for these zebra dolomites. The a and b1 dolomites are characterized by similar geochemical compositions and fluid inclusion data pointing toward a related origin. To explain the development of the zebra textures, suprahydrostatic pressures in conjunction with late Variscan tectonic compression are invoked. A model involving dolomitizing fluids expelled during the Variscan orogeny is proposed. An overpressured system is also invoked to explain the important porosity development, the creation of centimetre-scale subvertical displacements of the zebra pattern and the microfractures affecting the b1–b2 dolomite crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3091.1998.00171.x
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  • 5
    Electronic Resource
    Electronic Resource
    Multiple-step recrystallization within massive ancient dolomite units: an example from the Dinantian of Belgium (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 41 (1994), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: South of the Caledonian Brabant-Wales Massif a more than 200 m thick Tournaisian to Lower Visean replacive dolomite unit can be followed for several hundred kilometres from the Boulonnais (France) to Aachen (Germany). Field observations, of features such as karst cavities occurring at the top of the Lower Visean dolomite which are filled by Lower Visean crinoidal limestone, indicate that dolomitization and karstification took place during the Early Visean. This early development of the dolomite is in agreement with the presence of stylolites cutting the dolomite fabric. The minor element composition of the majority of the dolomites remains almost uniform throughout the entire studied area. Values for Fe, Mn, Na and Sr are normally in the range 700–4700 ppm, 15–400 ppm, 80–300 ppm and 50–200 ppm, respectively. The δ13C values (range-0.72 to +5.31%o) mainly reflect the carbon isotopic composition of the precursor limestones. The δ18O values, in contrast, are highly variable: ranging from-19.15 to +0.85%o. This rather large range of δ18O values is explained by multiple-step re-equilibration/recrystallization during progressive burial and subsequent uplift of the dolomites. These processes are also responsible for the high 87Sr/86Sr values of the dolomites which range from about 0.7088 to 0.7098. They are distinctly more radiogenic than Lower Visean marine carbonates (0.7076–0.7078). Correlation, however, of δ18O values or 87Sr/86Sr ratios with dolomite and/or cathodoluminescenec (CL) textures has not been very successful. This suggests that recrystallization may remain unrecognized if only petrographic techniques are used. Nevertheless, certain CL textures can be related to specific interactions with the ambient recrystallizing fluids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1994.tb02011.x
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  • 6
    Electronic Resource
    Electronic Resource
    Petrography and geochemistry of the Belle Roche breccia (lower Visean, Belgium): evidence for brecciation by evaporite dissolution (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 37 (1990), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The lower Visean Belle Roche breccia (east Belgium) displays a number of features that indicate brecciation by evaporite dissolution collapse: the sharp lower contact of the breccia, the gradual transition into the overlying strata, the presence of semi-continuous beds within the breccia giving it a crude ‘stratification’, and the existence of several types of (calcite, dolomite and silica) evaporite pseudomorphs. Furthermore, the majority of the breccia fragments indicates hypersaline to lagoonal sedimentation conditions. Most of these fragments display an interlocking fabric. The interpretation is also supported by the existence of continuous evaporite beds replaced by carbonates (calcite and dolomite) both under and overlying the breccia.The brecciation history is characterized by gradual subsidence. Multiple brecciation episodes are recognized, and are best seen in the lower breccia which underwent at least two major brecciation episodes. Here, brecciated and veined breccia fragments occur within a microsparite (neomorphosed mud) matrix. Brecciation of these strata was due to the dissolution of interlayered evaporites. The second brecciation event relates to infiltration of meteoric water and to the dissolution of the remaining evaporites. This infiltration was probably triggered by the orogenic event at the end of the Visean (Sudetic orogenic phase). The whole breccia was finally cemented by a blocky calcite.The different lithologies and cements were characterized by their trace element (Mg, Sr, Na, Fe, Mn, K), insoluble residue and organic matter content. Carbon/oxygen isotope data of the cements and replaced evaporite layers helped to place the multiple collapse episodes within a general diagenetic model. Solution-reprecipitation processes within the original aragonite-dominated mud fragments, as well as in the early diagenetic dolomite fragments, have been recognized. The geochemical data show that these transformation processes occurred in equilibrium with the same fluid. These processes may have occurred within a freshwater lens very early in the diagenetic evolution or under shallow burial conditions. Cementation of blocky calcite occurred in a meteoric realm under burial conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1990.tb01830.x
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  • 7
    Electronic Resource
    Electronic Resource
    Yield loss in plantain from black sigatoka leaf spot and field performance of resistant hybrids
    Amsterdam : Elsevier
    Field Crops Research 35 (1993), S. 35-42 
    Details
    ISSN: 0378-4290
    Keywords: Musa ; Mycosphaerella ; Pests and diseases ; Resistance
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0378-4290(93)90134-9
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  • 8
    Electronic Resource
    Electronic Resource
    Phenotypic variation among in-vitro propagated plantain (Musa sp. cultivar 'AAB')
    Amsterdam : Elsevier
    Scientia Horticulturae 36 (1988), S. 79-88 
    Details
    ISSN: 0304-4238
    Keywords: Musa ; in-vitro micropropagation ; plantain ; shoot tip culture ; somaclonal variation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0304-4238(88)90009-X
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  • 9
    Electronic Resource
    Electronic Resource
    Heavy metal contamination in overbank sediments of the Geul river (East Belgium): Its relation to former Pb-Zn mining activities (1994)
    Springer
    Environmental geology 24 (1994), S. 12-21 
    Details
    ISSN: 1432-0495
    Keywords: Heavy metal contamination ; Overbank sediments ; Pb-Zn mining
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Overbank sediments of the Geul River (East Belgium) are highly contaminated by the heavy metals Pb, Zn, and Cd due to former Pb-Zn mining activities in the drainage basin. Geochemical variations in vertical overbank sediment profiles sampled 1 km north of the mine tailings of Plombiéres allow metal fluxes back to the 17th century to be reconstructed. The vertical profiles are subdivided into three major units corresponding to different industrial periods based on sedimentological criteria as well as on the distribution of contaminants. Alluvial sediments with the highest heavy metal concentrations correspond to the major period of mining activity of the 19th century. The fact that Zn mining at the La Calamine open mine started before large-scale mining of the PbS-ZnS subsurface exploitations is reflected in the vertical profiles by an increase in Zn content before a marked increase in Pb and Cu. The regional extent of contamination in the alluvial deposits was evaluated on the basis of the geochemical analysis of sediments at depths of the 0–20 cm and 80–100 cm. Most of the upper samples are extremely contaminated. Significant local variations in heavy metal concentration in the lower samples are interpreted in terms of which overbank sediment horizon has been sampled at a depth of 80–100 cm. This indicates that “blind” sampling of overbank sediments to characterize the degree of contamination in shallow boreholes can give very erratic results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768072
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  • 10
    Electronic Resource
    Electronic Resource
    Lithogeochemical patterns around Pb-Zn mineralizations in Dinantian carbonate rocks of (eastern) Belgium (1990)
    Springer
    Mineralium deposita 25 (1990), S. 251-261 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The lithogeochemical distribution patterns of Mg, Sr, Na, Zn, Pb, Fe, Mn, K, Corg (organic matter) and IR (insoluble residue) in the Dinantian limestones and dolomites from the eastern part of Belgium have been studied (Dinant and Verviers synclinorium). Comparison of geochemical data of non-mineralized strata revealed higher background values in the strata of the Verviers synclinorium where Pb-Zn mineralizations occur. In this area a relation may exist with the metallogenetic district (Herve-Vesdre-Theux district; proposed by Dejonghe 1985b). However, the higher background values also could relate to the more restricted sedimentation conditions in the Verviers synclinorium as opposed to the more open marine conditions in the Dinant synclinorium. The influence of mineralization on the geochemistry of limestones is limited and unpredictable. In dolomites, however, the effect can be important. In these rocks, the lithogeochemical distribution of Zn, Pb and Mn can be subdivided into three populations, i.e. a regional background, a local high background and a halo population. The higher trace element concentrations in the halo population is caused by the existence of disseminated sulfide minerals (sphalerite, galena and pyrite) and Zn-bearing goethite (mainly pseudomorphs after pyrite) and Mn-oxides. The sulfides relate to the ore emplacement. In the local high background only the Zn-bearing oxides occur. Their presence and thus the development of the local high background relates to weathering processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00198994
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