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  • Articles  (35)
  • GFZ German Research Centre for Geosciences  (34)
  • American Chemical Society
  • American Institute of Physics (AIP)
  • 2020-2024  (35)
  • 1965-1969
  • 2023  (35)
  • 1
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    Superparamagnetic Iron Oxide Nanoparticle Nanodevices Based on Fe3O4 Coated by Megluminic Ligands for the Adsorption of Metal Anions from Water (2023)
    American Chemical Society
    Details
    Publication Date: 2023-01-16
    Description: The uptake ability toward arsenic(V), chromium(VI), and boron(III) ions of ad hoc functionalized magnetic nanostructured devices has been investigated. To this purpose, ligands based on meglumine have been synthesized and used to coat magnetite nanoparticles (Fe3O4) obtained by the co-precipitation methodology. The as-prepared hybrid material was characterized by infrared spectroscopy (IR), X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy combined with energy-dispersive X-ray analysis. Moreover, its magnetic hysteresis properties were measured to evaluate its magnetic properties, and the adsorption kinetics and isothermal models were applied to discern between the different adsorption phenomena. Specifically, the better fitting was observed by the Langmuir isotherm model for all metal ions tested, highlighting a higher uptake in arsenic (28.2 mg/g), chromium (12.3 mg/g), and boron (23.7 mg/g) sorption values if compared with other magnetic nanostructured materials. After adsorption, an external magnetic stimulus can be used to efficiently remove nanomaterials from the water. Finally the nanomaterial can be reused up to five cycles and regenerated for another three cycles.
    Description: Published
    Description: 10775–10788
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    The H2020 REFLECT project: Deliverable D2.3 – Mineral solubility and precipitation at high salinities (2023)
    GFZ German Research Centre for Geosciences
    Details
    Publication Date: 2023-04-06
    Description: Deliverable D2.3 reports the work performed in task 2.3 “Metal complexation and mineral precipitation” within the Reflect project. The task is divided into the subtasks 2.3.1 “Mineral solubility and precipitation kinetics”, 2.3.2 “Mineral precipitation by impedance spectroscopy” and 2.3.3 “Modelling mineral solubility”. A combination of experimental design, performed experiments and numerical modelling have increased the knowledge of mineral solubility and precipitation at high salinity condition in geothermal fluids.
    Language: English
    Type: info:eu-repo/semantics/report
    Format: application/pdf
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  • 3
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    3D structural geological model of the Mallik Anticline, Canadian Arctic (2023)
    GFZ German Research Centre for Geosciences
    In:  Scientific Technical Report STR - Data
    Details
    Publication Date: 2023-03-24
    Description: The Mallik Anticline is a geologic structure in the Mackenzie Delta in the Canadian Arctic. Tectonics throughout the Cenozoic, with compressional phases in the early Eocene to the late Miocene, formed this large, domed structure that is today an important source of hydrocarbons. Gas hydrates occur in the clastic sedimentary rocks of the Oligocene to Pleistocene Kugmallite, Mackenzie Bay, and Iperk sequences, which were essentially formed by deltaic processes. The presence of hydrocarbon gases within the permafrost zone in the Canadian Arctic has led to extensive exploration and production activities in the region since the mid-1960s, and the investigations by geologists and geophysicists have already been published in numerous scientific articles to date. This report describes the implementation of the first field-scale 3D static geologic model of the Mallik site, which was created using data from well logs and 2D seismic reflection profiles. The dataset related to this report provides elevation depths and thickness data of the three distinct sequence boundaries Kugmallit-Richards, Mackenzie Bay-Kugmallit and Iperk-Mackenzie Bay as well as fault data from the Mallik site.
    Language: English
    Type: info:eu-repo/semantics/report
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  • 4
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    Manual of the Python Script FAST Estimation v1.0 (2023)
    GFZ German Research Centre for Geosciences
    In:  WSM Technical Report
    Details
    Publication Date: 2023-02-24
    Description: The classical way to model the stress state in a rock volume is to estimate displacement boundary conditions that minimize the deviation of the modelled stress state with respect to model-independent stress information such as stress magnitude data. However, these data records are usually subject to significant uncertainties and measurement errors. Hence, it has to be expected that not all stress magnitude data records are representative and can be used in a model. In order to identify unreliable stress data records, the stress state that is based on individual data records is solved and compared with observations at a few discrete locations. While this method works, it is not efficient in that most of the solved model scenarios will be discarded. The solving of the entire model consumes immense amount of computation time for a high-resolution model. Yet, the stress state is required at only a very limited number of locations. For linear geomechanical models it is sufficient to estimate the stress state from three model scenarios with arbitrary, but different displacement boundary conditions. These three results can be used to estimate analytically using a linear regression at discrete points stress states based on user-defined boundary conditions. The tool Fast Automatic Stress Tensor Estimation (FAST Estimation) is a Python function that automatizes this approach. FAST Estimation provides very efficiently the stress states at pre-defined locations for all possible boundary conditions. It does not provide the continuous stress field as provided by a solved geomechanical model. Instead, it is a cost-efficient solution for the rapid assessment of stress states at a limited number of discrete locations based on pre-defined boundary conditions.
    Language: English
    Type: info:eu-repo/semantics/report
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  • 5
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    Deep Rock Weathering Episode 5 –Everything is Interaction (2023)
    GFZ German Research Centre for Geosciences
    Details
    Publication Date: 2023-02-20
    Description: During weathering of the deep rocks, many actors act together. This is a property characteristic of the entire “Earth system”. For example, fractures open up, through which water flows that carries carbon and reagants with it from above. New minerals are formed and open up further fractures. Large fractures are also a gateway for microbes from above. They multiply at depths where there is carbon and iron is oxidised. The explorer Alexander von Humboldt stated “Everything is interaction”. Under and on the earth. In our example, soil is created.
    Language: English
    Type: info:eu-repo/semantics/other
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  • 6
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    Deep Rock Weathering Episode 1 – Fracturing Rock when Plates Collide (2023)
    GFZ German Research Centre for Geosciences
    Details
    Publication Date: 2023-02-20
    Description: Weathering needs fractures in the rock. When two tectonic plates collide, the plates slide against each other. During earthquakes fractures in the rock are created. The microscope reveals tiny cracks running through the rock. These micro-fractures are caused by the movement of the rocks against each other, but also when erosion at the Earth's surface removes the burden of the overlying rock. Fractures are necessary to bring water, reagents, and microbes to depth to weather rocks.
    Language: English
    Type: info:eu-repo/semantics/other
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  • 7
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    Deep Rock Weathering Episode 3 – Reagents that Dissolve Minerals (2023)
    GFZ German Research Centre for Geosciences
    Details
    Publication Date: 2023-02-20
    Description: To weather rock, reagents are required. For example, CO2 is found in rainwater as carbonic acid or CO2 is produced by plant roots and by microbes. Through the large fractures carbonic acid and CO2 reach great depth – dissolved in water. Through the fine fractures they reach the interior of the rock. There they dissolve minerals, like the feldspar. New, completely different minerals form, for example clay minerals. They create fine fractures through which water with carbon can penetrate further and the weathering begins again.
    Language: English
    Type: info:eu-repo/semantics/other
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  • 8
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    Deep Rock Weathering Episode 2 – How Water Flows to Depth (2023)
    GFZ German Research Centre for Geosciences
    Details
    Publication Date: 2023-02-20
    Description: Weathering of rock needs water. A rock fractured by tectonic movement is gradually eroded from above, and it moves closer towards the Earth's surface. There it is exposed to precipitation and water begins to penetrate the soil and the layers beneath the soil. Through the tectonic fractures, the water can reach great depths. This is a rapid transport process. At a millimetre scale the water slowly moves into the interior along the smallest cracks that occur there. This is a slow transport process. The water can now weather rocks from the inside.
    Language: English
    Type: info:eu-repo/semantics/other
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  • 9
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    Deep Rock Weathering Episode 4 – Microbes that eat Rocks (2023)
    GFZ German Research Centre for Geosciences
    Details
    Publication Date: 2023-02-20
    Description: Living organisms can also weather rocks. There are microorganisms in deep rock – in the "deep biosphere". With flowing water, the microbes are transported from soil through the fractures to depth. Down there, in complete darkness, the microbes live on water, carbon, and energy. They can oxidise iron in minerals and receive energy in the process. The iron-containing minerals are oxidised, carbon is consumed, and more and more microbes are created. This is how the deep biosphere keeps itself alive and weathers the rock at the same time.
    Language: English
    Type: info:eu-repo/semantics/other
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  • 10
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    El asesinato de las rocas. ¿Qué ocurre bajo la superficie terrestre? (2023)
    GFZ German Research Centre for Geosciences
    Details
    Publication Date: 2023-02-19
    Description: Se descubre un misterioso crimen en un almacén. Muchas rocas han sido asesinadas. El detective Hércule Poirot emprende la investigación del caso. Para ello, contrata a un grupo de geo-científicos internacionales que buscan a los "culpables" en una campaña de perforación en los espectaculares paisajes de Chile. Los científicos encuentran pruebas del crimen en laboratorios de investigación y presentan una sorprendente solución al caso de asesinato. Esta película aborda una pregunta científica: ¿Cómo se convierte la roca en suelo en las profundidades de la superficie terrestre? Los cuatro "sospechosos" (es decir, los procesos) son las fracturas en la roca, el flujo de agua, los reactivos químicos y los microbios, los cuales se ven en acción en animaciones. Sin embargo, estas hipótesis no pueden demostrarse directamente, sólo puede demostrarse que son falsas, como una coartada en un caso criminal. Vea la película para averiguar si los investigadores logran resolver el caso. Esta película se produjo en el marco del proyecto germano-chileno "EarthShape – Earth iSurface Shaping by Biota". Puede ver de qué se trata aquí: La piel de la Tierra - donde la vida se encuentra con las rocas
    Language: Spanish
    Type: info:eu-repo/semantics/other
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