Влияние концентрации модификатора на структурные и функциональные свойства модифицированных нановолокон оксигидроксида алюминия

It was shown that the concentration of the modifier (manganese ions (II)) significantly affects the structural properties of the modified aluminum oxyhydroxide. In the phase composition of the samples modified and reduced content hydroxid and oxyhydroxide aluminum phases, which leads to a drop of the specific surface area from 196,16 to 10,78 m2/g. In the modified heating samples in air joint formed of aluminum oxide and manganese phase - MnAl2O4, and in the sample with the highest content of manganese oxides, manganese own found - Mn3O4, Mn2O3. The presence of manganese oxide phases making a modified aluminum oxyhydroxide promising as a catalyst for the oxidation of organic and inorganic compounds

Supporting Information Grobe et al. 2018 Tectonics - Multiphase structural evolution of a continental margin during obduction orogeny Insights from the Jebel Akhdar Dome, Oman Mountains

Supporting Information Grobe et al. 2018 Tectonics - Multiphase structural evolution of a continental margin during obduction orogeny Insights from the Jebel Akhdar Dom

Supporting Information Grobe et al. 2018 Tectonics - Multiphase structural evolution of a continental margin during obduction orogeny Insights from the Jebel Akhdar Dome, Oman Mountains

Supporting Information Grobe et al. 2018 Tectonics - Multiphase structural evolution of a continental margin during obduction orogeny Insights from the Jebel Akhdar Dom

Evolution of pressure, temperature and structures in the footwall of large-scale overthrusts - A case study of the Oman Mountains

The thesis on hand deals with the structural evolution, the related pressure and temperature history of the former passive margin sequence exposed in the Jebel Akhdar, Oman Mountains, with special focus on the period during and after overthrusting of the Semail Ophiolite, the largest exposed ophiolite on Earth. The ophiolite spans over 350 x 100 km and based on its size the passive margin underneath represents one of the biggest possible examples of an overthrusted sedimentary basin. A multidisciplinary approach integrating structural mapping, thermal reconstruction of peak temperatures and cooling ages, as well as plate motion reconstructions and numerical simulation of the basin evolution was applied to resolve the geologic evolution of the Oman Mountains. Presented investigations range from nano-, to micro-, outcrop- and orogen-scale and aim to reconstruct the pressure and temperature history underneath large scale obductions. To generate thermal maturity and related peak temperature data, different thermometers and how they can be applied to carbonaceous sediments were tested. Due to a lack of organic material of higher landplants in the Jebel Akhdar, vitrinite reflectance, a classical maturity parameter, was not usable. Solid bitumen, found in the Natih B source rock (top margin sequence), enabled peak temperature reconstruction and the calibration of a thermometer based on Raman spectroscopy of carbonaceous material (chapter 3). Differentiation of at least three solid bitumen generations on the southern flank of the Jebel Akhdar allowed to establish a paragenetic sequence: They relate to hydrocarbon generation initiated by burial under the ophiolite and two later phases of hydrocarbon migration. Reflectance analyses constrain peak temperatures of the Natih B source rock around the Jebel Akhdar dome to c. 240 °C. 1D numerical basin modeling and sensitivity analyses of the paleo-overburden indicate a required burial of 7.4 - 8 km under sedimentary and ophiolitic nappes to reach the observed thermal maturities. Structural mapping conducted on the northern flank of the Jebel Akhdar, and extending existing data of the southern flank, allows better time-constraints on the structural and thermal evolution (chapter 4). Relative ages of nine structural generations can be distinguished, based on more than 1,500 vein and fault overprintings: Ophiolite emplacement produced overpressure cells and three generations of bedding confined, tensional veins formed in an anticlockwise rotating stress field. A major, crustal-scale, top-to-NNE, ductile shear zone in the buried continental margin is the result of post-obduction exhumation associated with tectonic thinning of the ophiolite above. Exhumation-related shear deformed existing veins and formed a cleavage in argillaceous layers with increasing shear strain towards the north. Ongoing NE-SW extension during exhumation of the margin sequence formed normal- to oblique-slip faults and horst-graben structures that drained new high pressure cells. This was followed by NE-SW oriented ductile shortening that initiated the formation of the Jebel Akhdar anticline. We infer that the position of the horst-graben structures has predefined the location of the orogen. Further exhumation was associated with gravitational collapse observable at low angle normal faults (detachments) on the northern flank of the anticline. Results were linked to the other tectonic windows of the Oman Mountains, integrated in the geodynamic framework of the area, and compared to reconstructed plate motions of Arabia, India and Eurasia.In chapter 5, thermal maturity reconstructions based on the Raman spectroscopy based thermometer were extended along a mountain transect and applied to organic rich carbonates. In addition to host rock thermometry, fluid inclusions of quartz and calcite crystals inside veins were analyzed to reconstruct temperature and pressure conditions of vein closure. In combination with thermochronometrical dating, the burial and exhumation history of the Jebel Akhdar was reconstructed. Peak temperatures in the order of 226 -239 °C (top margin carbonates) to c. 300 °C (deeper margin sediments) were reached at deepest burial at c. 79 Ma. Cooling below 200 °C was ongoing between 49 - 39 Ma, contemporaneously with dome formation ((U-Th-Sm)/He-dating). At this time lithosstatic pressure in the Natih Fm. reached 340 MPa with pore pressures up to 300 MPa. An integrated 2D basin model of all presented data upscaled and confirmed results of 1D basin modeling. Moreover, it outlines that decreased horizontal permeability of the Natih Fm. is required to form overpressure cells and shows ophiolite obduction initiated southward migrating, tectonically expelled fluids. Chapter 6 presents first results of a reconnaissance study on a novel, broad ion beam based sample preparation method and compares it with traditional polishing. The idea arose during the tests of different paleo-thermometers