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Enlighten (160.815 recursos)

Enlighten is the University of Glasgow's institutional repository service for published research material including peer-reviewed journal articles, published conference papers,books and book chapters

Subject = Q Science: QE Geology

Mostrando recursos 1 - 20 de 258

  1. Induced seismicity response of hydraulic fracturing: results of a multidisciplinary monitoring at the Wysin site, Poland

    López-Comino, J. A.; Cesca, Simone; Jarosławski, Janusz; Montcoudiol, Nelly; Heimann, Sebastian; Dahm, Torsten; Lasocki, Stan; Gunning, Andrew; Capuano, Paolo; Ellsworth, William L.
    Shale oil and gas exploitation by hydraulic fracturing experienced a strong development worldwide over the last years, accompanied by a substantial increase of related induced seismicity, either consequence of fracturing or wastewater injection. In Europe, unconventional hydrocarbon resources remain underdeveloped and their exploitation controversial. In UK, fracturing operations were stopped after the Mw 2.3 Blackpool induced earthquake; in Poland, operations were halted in 2017 due to adverse oil market conditions. One of the last operated well at Wysin, Poland, was monitored independently in the framework of the EU project SHEER, through a multidisciplinary system including seismic, water and air quality...

  2. Gabbroic-dioritic dykes from the Sanadaj-Sirjan Zone: windows on Jurassic and Eocene geodynamic processes in the Zagros Orogen, western Iran

    Deevsalar, Reza; Shinjo, Ryuichi; Wang, Kuo-Lung; Yaganehfar, Hadi; Neill, Iain
    No abstract available.

  3. The Neogene evolution of topography and rivers along the Indus-Yarlung Suture Zone, southern Tibet

    Tremblay, Marissa M.; Willett, Sean D.; Shuster, David L.; Fox, Matthew; Zeitler, Peter K.; Schmidt, Jennifer L.; Winn, Carmen; Karlstrom, Karl E.

  4. Assessing Potential Shale Gas Impacts on Groundwater Resources: Recommendations for Groundwater Monitoring and Definition of Baseline Conditions

    Montcoudiol, Nelly; Banks, David; Gunning, Andrew; Isherwood, Catherine; Kelly, Thomas; Burnside, Neil

  5. The Mantle of Scotland Viewed Through the Glen Gollaidh Aillikite

    Hutchison, M.T.; Hughes, J.W.; Faithfull, J.W.
    No abstract available.

  6. Isolation, characterization, and metal response of novel, acid-tolerant Penicillium spp. from extremely metal-rich waters at a mining site in Transbaikal (Siberia, Russia)

    Glukhova, Lubov B.; Frank, Yulia A.; Danilova, Ehrzena V.; Avakyan, Marat A.; Banks, David; Tuovinen, Olli H.; Karnachuk, Olga V.
    The role of fungi in metal cycling in acidic environments has been little explored to date. In this study, two acid-tolerant and metal-resistant Penicillium isolates, strains ShG4B and ShG4C, were isolated from a mine site in the Transbaikal area of Siberia (Russia). Waters at the mine site were characterized by extremely high metal concentrations: up to 18 g l−1 Fe and >2 g l−1 each of Cu, Zn, Al, and As. Both isolates were identified as Penicillium spp. by phylogenetic analyses and they grew well in Czapek medium acidified to pH 2.5. Resistance to Cu, Cd, Ni, Co, and arsenate...

  7. Oxygen isotope analysis of the eyes of pelagic trilobites: testing the application of sea temperature proxies for the Ordovician

    Bennett, Carys E.; Williams, Mark; Leng, Melanie J.; Lee, Martin R.; Bonifacie, Magalie; Calmels, Damien; Fortey, Richard A.; Laurie, John R.; Owen, Alan W.; Page, Alex A.; Munnecke, Axel; Vandenbroucke, Thijs R.A.
    The oxygen isotope composition of well-preserved trilobite eye calcite, retaining its original optical properties, represents a possible source of information on Paleozoic sea temperatures. Species of the epipelagic telephinid genera Carolinites and Opipeuterella from strata of Early to Middle Ordovician age in Spitsbergen and Australia were analyzed, and compared with benthic asaphid species. Scanning electron microscope (SEM), cathodoluminescence (CL), electron microprobe and Electron Backscatter Diffraction (EBSD) techniques were used to assess eye preservation prior to isotope analysis. Some apparently well-preserved eyes are identified from the Valhallfonna (Spitsbergen) and Emanuel (Australia) formations. The eyes show a wide variation in δ18O values:...

  8. An evaluation of interferences in heat production from low enthalpy geothermal doublets systems

    Willems, Cees J.L.; Nick, Hamidreza M.; Weltje, Gert Jan; Bruhn, David F.
    Required distance between doublet systems in low enthalpy geothermal heat exploitation is often not fully elucidated. The required distance aims to prevent negative interference influencing the utilisation efficiency of doublet systems. Currently production licence areas are often issued based on the expected extent of the reinjected cold water plume on the moment of thermal breakthrough. The production temperature, however, may not immediately drop to non-economic values after this moment. Consequently, heat production could continue increasing the extent of the cold water plume. Furthermore, the area influenced by pressure because of injection and production spreads beyond the cold water plume extent,...

  9. Regional geothermal aquifer architecture of the fluvial Lower Cretaceous Nieuwerkerk Formation – a palynological analysis

    Willems, Cees J.L.; Vondrak, Andrea; Munsterman, Dirk K.; Donselaar, Marinus E.; Mijnlieff, Harmen F.
    The primary challenge for efficient geothermal doublet design and deployment is the adequate prediction of the size, shape, lateral extent and thickness (or aquifer architecture) of aquifers. In the West Netherlands Basin, fluvial Lower Cretaceous sandstone-rich successions form the main aquifers for geothermal heat exploitation. Large variations in the thickness of these successions are recognised in currently active doublet systems that cannot be explained. This creates an uncertainty in aquifer thickness prediction, which increases the uncertainty in doublet lifetime prediction as it has an impact on net aquifer volume. The goal of this study was to improve our understanding of...

  10. Subduction-related mafic to felsic magmatism in the Malayer-Boroujerd plutonic complex, western Iran

    Deevsalar, Reza; Shinjo, Ryuichi; Liégeois, Jean P.; Valizadeh, Mohammad V.; Ahmadian, Jamshid; Yeganehfar, Hadi; Neill, Iain
    The Malayer–Boroujerd plutonic complex (MBPC) in western Iran, consists of a portion of a magmatic arc built by the northeast verging subduction of the Neo-Tethys plate beneath the Central Iranian Microcontinent (CIMC). Middle Jurassic-aged felsic magmatic activity in MBPC is manifested by I-type and S-type granites. The mafic rocks include gabbroic intrusions and dykes and intermediate rocks are dioritic dykes and minor intrusions, as well as mafic microgranular enclaves (MMEs). MBPC Jurassic-aged rocks exhibit arc-like geochemical signatures, as they are LILE- and LREE-enriched and HFSE- and HREE-depleted and display negative Nb–Ta anomalies. The gabbro dykes and intrusions originated from metasomatically...

  11. High-precision 41K/39K measurements by MC-ICP-MS indicate terrestrial variability of δ41K

    Morgan, Leah E.; Santiago Ramos, Danielle P.; Davidheiser-Kroll, Brett; Faithfull, John; Lloyd, Nicholas S.; Ellam, Rob M.; Higgins, John A.
    Potassium is a major component in continental crust, the fourth-most abundant cation in seawater, and a key element in biological processes. Until recently, difficulties with existing analytical techniques hindered our ability to identify natural isotopic variability of potassium isotopes in terrestrial materials. However, measurement precision has greatly improved, and a range of K isotopic compositions has now been demonstrated in natural samples. In this study, we present a new technique for high-precision measurement of K isotopic ratios using high-resolution, cold plasma multi-collector mass spectrometry. We apply this technique to demonstrate natural variability in the ratio of 41K to 39K in...

  12. Zebra rocks: compaction waves create ore deposits

    Kelka, Ulrich; Veviakis, Manolis; Koehn, Daniel; Beaudoin, Nicolas
    Nature has a range of distinct mechanisms that cause initially heterogeneous systems to break their symmetry and form patterns. One of these patterns is zebra dolomite that is frequently hosting economically important base metal mineralization. A consistent generic model for the genesis of these periodically banded rocks is still lacking. In this contribution, we present for the first time a fully consistent mathematical model for the genesis of the pattern by coupling the reactive fluid-solid system with hydromechanics. We show that visual banding develops at a given stress and host-rock permeability indicating that the wavelength and occurrence of the pattern...

  13. Zebra rocks: compaction waves create ore deposits

    Kelka, Ulrich; Veviakis, Manolis; Koehn, Daniel; Beaudoin, Nicolas
    Nature has a range of distinct mechanisms that cause initially heterogeneous systems to break their symmetry and form patterns. One of these patterns is zebra dolomite that is frequently hosting economically important base metal mineralization. A consistent generic model for the genesis of these periodically banded rocks is still lacking. In this contribution, we present for the first time a fully consistent mathematical model for the genesis of the pattern by coupling the reactive fluid-solid system with hydromechanics. We show that visual banding develops at a given stress and host-rock permeability indicating that the wavelength and occurrence of the pattern...

  14. Zebra rocks: compaction waves create ore deposits

    Kelka, Ulrich; Veviakis, Manolis; Koehn, Daniel; Beaudoin, Nicolas
    Nature has a range of distinct mechanisms that cause initially heterogeneous systems to break their symmetry and form patterns. One of these patterns is zebra dolomite that is frequently hosting economically important base metal mineralization. A consistent generic model for the genesis of these periodically banded rocks is still lacking. In this contribution, we present for the first time a fully consistent mathematical model for the genesis of the pattern by coupling the reactive fluid-solid system with hydromechanics. We show that visual banding develops at a given stress and host-rock permeability indicating that the wavelength and occurrence of the pattern...

  15. Shale Gas Impacts on Groundwater Resources: Understanding the Behavior of a Shallow Aquifer Around a Fracking Site in Poland

    Montcoudiol, Nelly; Isherwood, Catherine; Gunning, Andrew; Kelly, Thomas; Younger, Paul L.
    Exploitation of shale gas by hydraulic fracturing (fracking) is highly controversial and concerns have been raised regarding induced risks from this technique. As part of the EU-funded SHEER Project, a shallow aquifer used for drinking water, overlying a zone of active shale-gas fracking, has been monitored for more than a year. Early results reveal the functioning of the shallow aquifer and hydrochemistry, focusing on the identification of potential impacts from the shale gas operation. This stage is an essential precursor to modeling impact scenarios of contamination and to predict changes in the aquifer.

  16. Fingerprinting coal-derived gases from the UK

    Györe, Domokos; McKavney, Rory; Gilfillan, Stuart M.V.; Stuart, Finlay M.
    The large-scale extraction of unconventional hydrocarbons in the United States has led to fears of methane contamination of shallow groundwaters. Differentiating between the deep gas released during extraction (shale gas, coal bed methane and underground coal gasification) and natural shallow-sourced methane is imperative for the monitoring and managing of environmental risks related to the extraction process. Here, for the first time, we present measurements of the major gas, and stable and noble gas isotope composition of coal bed methane (CBM) from central Scotland and coal mine methane (CMM) from central England, UK. The molecular (C1/(C2+C3) = 21 to 120) and...

  17. Graphical statistics to explore the natural and anthropogenic processes influencing the inorganic quality of drinking water, ground water and surface water

    Flem, Belinda; Reimann, Clemens; Fabian, Karl; Birke, Manfred; Filzmoser, Peter; Banks, David
    Plots of cumulative distribution functions (CDF) are a simple but powerful exploratory data analysis (EDA) tool to evaluate and compare statistical data distributions. Here, empirical CDF plots are used to compare results of four large (476 to 884 samples) national- to continental-scale inorganic water chemistry data sets: (1) European surface water, (2) European tap water, (3) European bottled waters as a proxy for groundwater and (4) Norwegian crystalline bedrock rock groundwater, all analysed at the same laboratory, albeit at different times. For many parameters (e.g., Ba, Cl-, K, SO4 2-) median values and ranges are, given the differing origins and, in...

  18. The inherent tracer fingerprint of captured CO2

    Flude, Stephanie; Györe, Domokos; Stuart, Finlay M.; Zurakowska, Marta; Boyce, Adrian J.; Haszeldine, R. Stuart; Chalaturnyk, Rick; Gilfillan, Stuart M.V.
    Carbon capture and storage (CCS) is the only currently available technology that can directly reduce anthropogenic CO2 emissions arising from fossil fuel combustion. Monitoring and verification of CO2 stored in geological reservoirs will be a regulatory requirement and so the development of reliable monitoring techniques is essential. The isotopic and trace gas composition - the inherent fingerprint - of captured CO2 streams is a potentially powerful, low cost geochemical technique for tracking the fate of injected gas in CCS projects; carbon and oxygen isotopes, in particular, have been used as geochemical tracers in a number of pilot CO2 storage sites,...

  19. Fingerprinting the Temperature and Fluid Source of Fracture-Filling Calcite in Geothermal Systems Using Clumped Isotopes

    MacDonald, John; Milicich, Sarah; Davies, Amelia; Holdsworth, Chris; Newton, Michael; Williamson, Sam; Faithfull, John; McNamara, David; John, Cedric
    No abstract available.

  20. Formation of Exceptional Secondary Mineralisation in SW Scotland During the Onset of Northern Hemisphere Glaciation Revealed by (U+Th)/21Ne Dating

    Stuart, Finlay; Faithfull, John
    No abstract available.

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