Geochemistry, scientific discipline that deals with the relative abundance, distribution, and migration of the earths chemical elements and their isotopes. Process tomography of diffusion, using pet, to evaluate anisotropy and heterogeneity. Opalinus clay is similar to values reported for hydroquinone and implies an average degree of hydroxyla tion close to 20hring and. However, to fully consider this biological process in models of repository evolution over time, it is crucial to determine the in situ rates of microbial hydrogen oxidation and sulfate reduction. Plutonium plays an important role within nuclear waste materials because of its long halflife and high radiotoxicity. Geochemistry american association of petroleum geologists. Pdf on the fate of oxygen in a spent fuel emplacement. On the fate of oxygen in a spent fuel emplacement drift in opalinus clay article pdf available in applied geochemistry 97 august 2018 with 175 reads how we measure reads. Applied geochemistry the 7th international conference on. Mont terri project geochemistry of water in the opalinus clay formation at the mont terri rock laboratory. Articles from the special issue on the 7th international conference on clays in natural and engineered barriers for radioactive waste. Geochemistry of water in the opalinus clay formation at the mont terri laboratory. Elastic anisotropy of opalinus clay under variable.
Unraveling the surface geochemistry of hydrated clay minerals is an abiding, if difficult, topic in earth sciences research. High gas overpressures are to be avoided in radioactive waste repositories and, thus, microbial consumption of h2 is generally viewed as beneficial. The opalinus clay formation will host geological nuclear waste repositories in switzerland. Geochemical signature of paleofluids in microstructures from main fault in the opalinus clay of the mont terri rock laboratory, switzerland. Based on a detailed microstructural description of veins, slickensides, scaly clay aggregates and gouges, the geochemical signatures of the infillings were. Porewater geochemistry, method comparison and opalinus clay passwang formation interface study at the mont terri url nwmotr201710 june 2017 h. Read study of the pore water chemistry through an argillaceous formation. Pdf rock and mineral characterisation of the opalinus clay.
Characterization of dissolved organic matter in anoxic rock extracts and in situ pore water of the opalinus clay. Download a pdf copy of some of the aqueous geochemistry notes and diagrams used in class 2. Niklaus waber and daniel rufer waterrock interaction, institute of geological sciences, university of bern, switzerland. This paper presents the results of the o2 monitoring during the backfilling and early heating phases of the fullscale emplacement experiment at the mont terri. A total of 250 till samples from 140test pits were studied mineralogically and geochemically. In the model simulations, we use clay host rock properties derived from the opalinus clay at mont terri, switzerland gens et al.
Reactive transport calculations to evaluate sulphide fluxes in the nearfield of a sfhlw repository in the opalinus clay. Pdf litho and biostratigraphy of the opalinus clay and bounding. Geochemical interactions of plutonium with opalinus clay. Keywords geochemical evolution 4 porewater tracers 4. Br, i, na, sr, cs in a single sample of opalinus clay.
Jan 19, 2017 the present study reports on elemental and sr isotopic analyses of calcite and associated celestite infillings of various microtectonic features collected mostly in the main fault of the opalinus clay from mont terri rock laboratory. Twelve partners from six different countries participate today in the project. Reconstructing a hydrogendriven microbial metabolic network. Geochemical signature of paleofluids in microstructures from. Geological disposal is the preferred option for the final storage of highlevel nuclear waste and spent nuclear fuel in most countries. Geol 414514 the geochemistry of clay minerals chapter 9 langmuir. Edited by andreas gautschi, irina gaus, thomas gimmi, martin mazurek, paul wersin, michel cathelineau and adrian bath. Corrosioninduced gas generation in a nuclear waste repository. It is predicted that opalinus clay behaves poroelastically anisotropic. Based on a detailed microstructural description of veins, slickensides, scaly clay aggregates and gouges, the geochemical signatures of the infillings were compared to those of the leachates from undeformed opalinus clay, and to the calcite from veins crosscutting hauptrogenstein, passwang and staffelegg formations above and below the opalinus. Thermohydro mechanical and geochemical behaviour of the callovooxfordian argillite and the opalinus clay final report chunliang zhang tilmann rothfuchs helge moog jurgen dittrich jurgen muller march 2004 remark. For geological reasons, a repository for radioactive waste in the mont terri region has been. Opalinus clay as a potential host rock for nuclear waste.
Applied geochemistry vol 100, pages 1444 january 2019. Nomenclature for trace element classification pdf 6. Opalinus clay as a potential host rock for nuclear waste repositories 8 march 2011 the experimental setup shows two diffusion cells with builtin clay cylinders and vials with pore water. A computational approach that uses realistic pore microstructures of shales as input for finiteelement modeling was used to predict the poroelastic behaviour of opalinus clay. The model was developed to simulate insitu tracer diffusion experiments in opalinus clay with tritium, iodide, and sodium. Interpretation of the mineralogical and geochemical data acquired in. Relationships between mineralogical composition and. The numerical results show good agreement with the experimental data measured in these tests in terms of twophase flow regimes and. Chloride concentration profiles along the mont terri rock laboratory pearson et al. Process tomography of diffusion, using pet, to evaluate. Implications for the modeling of porewater chemistry in a clay formation clays and clay minerals 2014 62. Mineralogical and isotopic record of diagenesis from the. Page 1 of 1 corrosioninduced gas generation in a nuclear waste repository. Geochemical processes in compacted clay in contact with an acid landfill leachate.
Rates of microbial hydrogen oxidation and sulfate reduction. The larger permanent anion exclusion in the helvetic marl sample compared to the opalinus clay sample can be explained by the larger retention potential and larger effective tortuosity of the helvetic marl rock, which indicates more pores with bottleneck effects than is the case for the opalinus clay rock. Geochemistry of water in the opalinus clay formation at the mont terri rock. Demonstration of disposal feasibility for spent fuel, vitrified highlevel waste. These applications derive fundamentally from the colloidal size and permanent structural charge of clay mineral particles, which endow them with significant surface reactivity. Ionic model for bonding and the role of ionic radii in understanding the partitioning of trace elements between phases pdf 5. Solute transport solved with the nernstplanck equation for concrete pores with free water and a double layer.
With these options, solute species can be transported in coexisting charged and uncharged regions as may exist in clays and membranes. Geochemistry is the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the earths crust and its oceans 1 the realm of geochemistry extends beyond the earth, encompassing the entire solar system, and has made important contributions to the understanding of a number of processes including mantle convection, the formation. Rock and mineral characterisation of the opalinus clay formation. Porewater evolution and solutetransport mechanisms in opalinus. Montterriprojecttechnical report 200803 august 2008. Microbial metabolism and its byproducts could affect the physical and geochemical conditions in such a repository.
Abstract the cement opalinus clay interaction ci experiment at the mont terri rock laboratory is a longterm passive diffusionreaction experiment between contrasting materials of relevance to engineered barrier systemsnear. Elastic anisotropy of opalinus clay under variable saturation. Pdf a 250 mdeep inclined well, the mont terri bdb1, was drilled through the jurassic opalinus. The purposes of this association are to advance the science of geology. Mont terri project geochemistry of water in the opalinus clay formation no.
The rock properties in table 3 correspond to that of opalinus clay, with values taken from gens et al. Reactive transport modeling of coupled processes in. Ales bajer tento projekt je spolufinancovan evropskym socialnim fondem a statnim rozpoctem cr inobio cz. It is well known that the geomechanical properties. Pdf microbial community analysis of opalinus clay drill. Geochemical parameters and estimated porewater composition of. Jan 01, 2009 read transport of 234 u in the opalinus clay on centimetre to decimetre scales, applied geochemistry on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Oct 14, 2016 the opalinus clay formation will host geological nuclear waste repositories in switzerland. The aim of this study was to investigate with high spatial resolution the reactivity of the more oxidized forms of puv,vi within opalinus clay opa rock, a heterogeneous, natural argillaceous rock considered as a potential repository host.
Measurements of effective diffusion coefficients and evaluation of their importance in. Deposition of the opalinus clay began at the same time farther east in northern. The mineralogy and geochemistry of the fine and clay fractions oftill in different moraine types and in different bedrock areas innorthern finland have been studied. The composition of the ddl is calculated with the donnan approximation.
Diffusion and retention behaviour of cs in illiteadded. White and are available here with the understanding that. Measurements of effective diffusion coefficients and evaluation of their importance in view of microbial mediated reactions in the near field of radioactive waste repositories. Recent experimental and computational studies that take advantage of new methodologies and basic. Part e equilibrium controls on chemistry of pore water from the opalinus clay, mont terri underground research laboratory, switzerland. Nese kurt, suat akbulut the dynamic shear modulus and dampin ratio of clay nanocomposites. Mont terri project geochemistry of water in the opalinus clay formation at the mont terri rock. Mont terri project geochemistry of water in the opalinus clay formation at the mont terri rock laboratorysynthesis report. Report of the swiss federal office for water and geology, geology series. Opalinus clay is a candidate host rock for a highlevel radioactive waste repository in switzerland. Opalinus clay decreases with increasing carbonate content while the failure. Geochemical signature of paleofluids in microstructures. The selected host rock may be different in individual national programs for radioactivewaste management and the engineered barrier systems that protect and isolate the waste may also differ, but almost all programs are considering an engineered barrier. Porewater geochemistry, method comparison and opalinus.
The present study reports on elemental and sr isotopic analyses of calcite and associated celestite infillings of various microtectonic features collected mostly in the main fault of the opalinus clay from mont terri rock laboratory. Proton and trivalent metal cation binding by dissolved. Mineralogy and geochemistry of the fine and the clay. Relationships between mineralogical composition and geomechanical properties of opalinus clay for the save storage of nuclear waste in an underground repository in switzerland, opalinus clay, a clay shale, has recently been selected as host rock.
The field of geochemistry slowly emerged along with the development of geology in 1700 and 1800s james hutton, 17261797, is known as the father. Modeling of coupled thermohydromechanical processes with. The vast majority of published reactive transport studies dealing with clay and cement materials are related to the evaluation of the longterm stability of surface and underground radioactive waste storage systems claret et al. We simulated laboratory and field gas injection experiments in opalinus clay, a candidate geological formation for the geological disposal of radioactive wastes. Mineralogical and isotopic record of diagenesis from the opalinus clay formation at benken, switzerland. Thermodynamic consideration of te solid solutions pdf 3. The proton, curium, and europium binding properties of the opa pore water and the extracted dom of both rocks were. Mont terri project geochemistry of water in the opalinus. However, the presence of tectonic faults intersecting the opa formation put the long. We investigated the proton and trivalent metal binding of dissolved organic matter dom in in situ pore water and anoxic rock extracts of two potential host rocks for the disposal of radioactive waste, i. It is expected that gas pressure will buildup due to hydrogen production from steel corrosion. Diffusion and retention behaviour of cs in illiteadded compacted montmorillonite volume 51 issue 2 takamitsu ishidera, seiichi kurosawa, masanori hayashi, keiji uchikoshi, hikari beppu. The method consists in recording pwave velocities along numerous paths on a cylindrical specimen using miniature ultrasonic transducers. Thermohydro mechanical and geochemical opalinus clay.
The in situ experiment on biogeochemical processes in the opalinus clay at the mont terri underground research laboratory, switzerland. The american association of petroleum geologists is an international organization with over 38,000 members in 100plus countries. Geochemistry of water in the opalinus clay formation at the. Overview and notes on v feldspar weathering will save you writing a lot of complicated clay mineral formulae and may help as you work through the current lab. In the jurassic period, around 173 million years ago, the opalinus clay was formed by the deposition of. Here, we utilize the flac3d ubiquitous joint model, a model also used by corkum and martin 2007 when simulating previous in situ experiments in opalinus clay at mont terri. Results and modelling from an in situ experiment in opalinus clay. Read transport of 234 u in the opalinus clay on centimetre to decimetre scales, applied geochemistry on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
The fowg is in charge of the project direction since july 2001 and is also responsible for the publication of the reports. Based on a detailed microstructural description of veins, slickensides, scaly clay aggregates and gouges, the geochemical signatures of the in. Full text views reflects the number of pdf downloads. Opalinus clay is being investigated as a potential host rock for the storage of nuclear waste due to its very low hydraulic conductivity, selfsealing of open cracks and fissures, and excellent retention of radionuclides. Characteristics of the opalinus clay at mont terri page 8 50 figure an 15. H2fuelled microbial metabolism in opalinus clay epfl. Corrosioninduced gas generation in a nuclear waste. Dewhurst, elastic anisotropy of opalinus clay under variable saturation and triaxial stress. Here, we utilize the flac3d ubiquitous joint model, a model also used by corkum and martin 2007 when simulating previous. Rock and mineral characterisation of the opalinus clay. Characteristics of the opalinus clay at mont terri paul bossart reference. Multicomponent diffusion modeling in clay systems with. The rock laboratory, in which the opalinus clay oc.
Reactive geochemistry and multiphase flow effects tianfu xu1, rainer senger2, and stefan finsterle1 1earth sciences division, lawrence berkeley national laboratory, berkeley, ca 94720, usa 2intera inc. A novel experimental method is introduced to estimate the thomsens elastic anisotropy parameters. Available formats pdf please select a format to send. Geochemical processes in compacted clay in contact with an.
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