A5101498600- CO2 Sequestration and Geologic Interactions
- Geological and Geochemical Analysis
- Groundwater flow and contamination studies
- earthquake and tectonic studies
- Hydrocarbon exploration and reservoir analysis
- Hydraulic Fracturing and Reservoir Analysis
- High-pressure geophysics and materials
- Geothermal Energy Systems and Applications
- Silicon Effects in Agriculture
- Geochemistry and Geologic Mapping
- Methane Hydrates and Related Phenomena
- Enhanced Oil Recovery Techniques
- Groundwater and Isotope Geochemistry
- Geological Modeling and Analysis
- Spectroscopy and Laser Applications
- Astro and Planetary Science
- Geochemistry and Elemental Analysis
- Karst Systems and Hydrogeology
- Geomagnetism and Paleomagnetism Studies
- Paleontology and Stratigraphy of Fossils
- Radioactive element chemistry and processing
- Mineralogy and Gemology Studies
- Concrete and Cement Materials Research
- NMR spectroscopy and applications
- Analytical chemistry methods development
University of St Andrews
2015-2024
Federal Institute for Geosciences and Natural Resources
2015-2022
Johannes Gutenberg University Mainz
2012-2022
Friedrich-Loeffler-Institut
2015
GFZ Helmholtz Centre for Geosciences
2010-2014
Technische Universität Berlin
2011-2014
Fraunhofer Institute for Production Systems and Design Technology
2013
The central region of the mainland Lewisian gneiss complex NW Scotland is a granulite-facies migmatite terrane. With exception ultramafic and rare calc-silicate rocks, all other lithologies partially melted during Neoarchaean, ultrahigh-temperature (Badcallian) metamorphism. clearest evidence preserved within large layered mafic–ultramafic bodies that exhibit macroscopic features diagnostic anatexis. In situ partial melting metagabbroic rocks produced patches sheets coarse-grained...
Research Article| October 01, 2015 Precambrian reidite discovered in shocked zircon from the Stac Fada impactite, Scotland S.M. Reddy; Reddy * 1Department of Applied Geology, Institute for Geoscience (TIGeR), Curtin University, GPO Box U1987, Perth, WA 6845, Australia *E-mail: s.reddy@curtin.edu.au Search other works by this author on: GSW Google Scholar T.E. Johnson; Johnson S. Fischer; Fischer 2Department Earth and Environmental Sciences, University St Andrews, Fife KY16 9AL, UK W.D.A....
Unraveling ancient melting processes is key to understanding how the earliest, tonalite-trondhjemite-granodiorite (TTG)-dominated continental crust formed from partial of amphibolite. Application silicon isotope analysis reveals that Archaean TTGs exhibit consistently high Si values (δ30Si) compared modern granitoids, attributed seawater-derived silica introduced by either (a) variably silicified basalts or (b) assimilation authigenic silica-rich marine lithologies in melt source. However,...
The central region of the mainland Lewisian complex is dominated by granulite-facies tonalite–trondhjemite–granodiorite (TTG) gneisses that are highly depleted in some mobile trace elements (Cs, Rb, Th and U) relative to amphibolite-facies TTG elsewhere average composition worldwide. Over almost half a century research there has been vigorous debate as origin this depletion, particular with respect role partial melting melt loss. Here we provide field petrographic evidence across partially...
Sandstone samples of the Stuttgart Formation at Ketzin have been experimentally treated with CO2 and synthetic reservoir brine in high-quality steel autoclaves simulated situ P-T conditions 5.5 MPa 40 °C. In order to observe mineralogical changes induced by CO2, untreated are compared CO2-treated ones. Samples show a comparable petrography mainly quartz plagioclase. Heterogeneities related minor mineral phases, such as K-feldspar, hematite, muscovite, biotite, illite, chlorite, opaque...
To study the long term effects of geochemically and microbially induced mineral dissolution precipitation during CO2 storage their impact on reliability efficiency, laboratory experiments under in situ P-T conditions were performed. Long exposure initiated September 2007 using fresh core material from reservoir horizon at CO2SINK project Ketzin, Germany. Formation water-filled sandstone samples, obtained a depth 627 to 633 m, have been incubated individually high pressure vessels together...
The type locality for high-temperature, low-pressure regional metamorphism, the Buchan Block in NE Scotland, exhibits profound differences to rest of Grampian Terrane. These have led some regard as an exotic crustal fragment comprising Precambrian basement gneisses and cover rocks thrust into their current position during orogenesis. Although are now generally correlated with Dalradian strata elsewhere, origin cause high heat flow associated magmatism is debated. We report SIMS U–Pb LA-ICPMS...
In order to investigate and characterize single fluid-mineral interactions we successfully implemented a new hydrothermal laboratory. CO2-exposure experiments using separates of rock-forming minerals were performed on rocking autoclave. The system is equipped with flexible Titanium cells allowing for isobaric sampling. Experiments run one week at 80°C 20 MPa/30 MPa. Rietveld refined XRD data reveal that the initial siderite separate composed 69.6±1.3 wt% siderite, 26.7±1.2 ankerite 3.8±0.8...
Abstract Rocks exposed along the Scottish coast between Fraserburgh and Inzie Head contain information critical to understanding evolution of Buchan Block, type locality for low‐ P , high‐ T regional metamorphism, its relationship with rest Grampian terrane, one major tectonostratigraphic components Caledonides. The ~8 km long section traverses a network shear zones and, at highest grades around Head, passes into core Anticline, large‐scale open fold that is commonly regarded as late...
Due to the strong interest in geochemical CO2-fluid-rock interaction context of geological storage CO2 a growing number research groups have used variety different experimental ways identify important dissolution or precipitation reactions and – if possible quantify rates extent mineral rock alteration. In this inter-laboratory comparison gas-fluid-mineral three samples rock-forming minerals been investigated by 11 labs. The reported results point robust identification major processes...
In summer 2013, a four week N2-CO2 co-injection field test was conducted at the Ketzin pilot site. Major objectives were (i) demonstrating technical feasibility of continuous scenario, (ii) monitoring wellhead and reservoir pressure, (iii) spreading behavior CO2-N2 gas mixture in reservoir, (iv) analyzing potential chromatographic effects within reservoir. 10,000 L (10 Nm3) krypton (Kr) injected as an additional conservative chemical tracer prior to injection mixture. For CO2 from natural...
The use of silicon (Si) isotopes has led to major advances in our understanding Si cycling modern and past environments. This inter‐laboratory comparison exercise provides the community with first set soil plant reference materials an analytically challenging matrix containing organic material that is known induce isotopic bias, for as secondary isotope measurement. Seven laboratories analysed four (GBW‐07401, GBW‐07404, GBW‐07407, TILL‐1) one (ERM‐CD281). Participating employed a range...
Abstract Mineralogical and geochemical observations from laboratory CO 2 ‐exposure experiments on reservoir rocks are compared with predictions modeling that was performed using PHREEQC software. The Pitzer‐based Eq 3/6 thermodynamic database, provided by Quintessa Ltd., applied. For kinetic modeling, a Lasaga‐type rate equation implemented different models were parameterized taking law parameters literature. Based previous studies modified inverse approach is presented here. This comprises...
In carbon dioxide capture and storage operations (CCS), impurities in CO2 flue gas are an important aspect concerning the geochemical reactions between injected gas, rock minerals a reservoir brine. Numerical reactive transport simulations capable to evaluate main mineral their spatial temporal occurrences under impact of co-injected impurities. For inclusion such simulations, different modeling approaches evaluated (additional brine injection, trace transport, or combination two). The...
Abstract Gypsum crystals are found at the well perforation of observation Ktzi 202 test site for CO 2 storage Ketzin, Germany. XRD analysis confirms pure gypsum. Fluid samples before and after injection analyzed. Geochemical modeling is conducted to identify mechanisms that lead gypsum formation. The carried out with PHREEQC Pitzer database due high salinity up 5 mol per kg water. Due their significantly higher reactivity compared other minerals like silicates, calcite, dolomite, magnesite,...
Abstract. The composition of mineral, thermal or deep groundwaters is interest for several geotechnical applications, such as drinking-water supply, spas geothermal energy. Verified and reliable knowledge temperature, pH, hydrochemical other parameters crucial to extract fluids with few technical problems possible exploit groundwater reservoirs economically environmentally sustainably. However, at sites where empirical data are lacking, the correct prediction fluid properties often...
Experiments on CO2-brine-mineral interactions were designed to provide kinetic data for individual rock-forming minerals. Samples of an illite-smectite mixed layer mineral and a labradorite separate stored in flexible Ti-cells together with 2 M NaCl brine pure CO2 at 80 °C 20 MPa two three weeks, respectively. The empirical formulae K0.5-0.7(Mg0.1-0.2Al1.8-1.9)(Al0.4-0.6Si3.4-3.6)O10(OH)2 Na0.5-0.6Ca0.4-0.5Al1.3-1.6Si2.4-2.6O8 calculated illite labradorite. X-ray diffraction Rietveld...
Experiments to investigate individual CO2-brine-mineral interactions were designed provide dissolution kinetics for rock-forming minerals. Separates of an iron carbonate, a clay mineral and feldspar stored in flexible Titanium Grade-2 cells together with 2 M NaCl brine pure CO2 at 80 °C 20 (30) MPa one (iron carbonate), two (clay) three (feldspar) weeks, respectively. The carbonate separate consists 96.3±3.2 wt% 3.7±0.8 quartz the phase being composed 72.3±1.4 siderite 27.7±1.2 ankerite....
Abstract. The composition of mineral, thermal or deep groundwaters is interest for several geotechnical applications, such as drinking water supply, spas geothermal energy. A verified and reliable knowledge temperature, pH, hydrochemical other parameters crucial to extract fluids with few technical problems possible exploit groundwater reservoirs economically environmentally sustainable. However, at sites where empirical data are lacking, the correct prediction fluid properties often...