Currently available models to simulate naturally occurring mineral-melt equilibria use mineral components limited to tholeiitic basalt compositions and thus they cannot be used for alkali-rich basalts and basanites. To expand mineral-melt equilibria calculations to alkali-rich composition space at low pressures, we have derived equations that describe chemical equilibria between olivine-melt, pyroxene-melt, plagioclase-melt, nepheline-melt and leucite-melt components. Excess free energies of reactions between the end-member mineral and melt components at equilibrium have been expressed as a function of melt composition, temperature and f(O2). The database used to calculate the mineral-melt expressions consists of a total of >350 anhydrous experiments conducted under controlled oxygen fugacity defined by the quartz-fayalite-magnetite (QFM) oxygen buffer. Rocks used in these experiments range from basanites, nephelinites and alkali olivine basalts, to tholeiitic basalts and basaltic andesites. Using bulk compositions of starting materials both in this experimental database and in others that were not incorporated into the regression of modeled parameters, modeled equations successfully predict, at a given temperature and fo, compositions of multiply saturated melts as well as the compositions of coexisting minerals. Standard deviations of the calculated male fractions of mineral components (sigma) are as follows: anorthite 0.02; forsterite 0.02; clinoenstatite 0.02; enstatite 0.003; nepheline 0.02; and leucite 0.01. Standard deviations (sigma) of the calculated melt compositions in terms of weight percent of oxides are: SiO2 0.96; Al2O3 1.32; Fe2O3 0.23; FeO 1.21; MgO 0.84; CaO 0.79; Na2O 0.58; and K2O 0.69. All calculations were carried out using a non-linear Newton-Raphson numerical procedure.


Multiscale Self-Assembly of Silicon Quantum Dots into an Anisotropic Three-Dimensional Random Network
İlday, Serim Kayacan; İlday, Fatih Ömer; Huebner, Rene; Prosa, Ty J.; Martin, Isabelle; Nogay, Gizem; Kabacelik, Ismail; Mics, Zoltan; Bonn, Mischa; Turchinovich, Dmitry; Toffoli, Hande; Toffoli, Daniele; Friedrich, David; Schmidt, Bernd; Heinig, Karl-Heinz; Turan, Raşit (American Chemical Society (ACS), 2016-03-01)
Multiscale self-assembly is ubiquitous in nature but its deliberate use to synthesize multifunctional three-dimensional materials remains rare, partly due to the notoriously difficult problem of controlling topology from atomic to macroscopic scales to obtain intended material properties. Here, we propose a simple, modular, noncolloidal methodology that is based on exploiting universality in stochastic growth dynamics and driving the growth process under far-from-equilibrium conditions toward a preplanned s...
Hydrothermal synthesis of TiO₂ nanostructures for photocatalitic and photovoltaic applications
Erdoğan, Nursev; Öztürk, Abdullah; Park, Jongee; Department of Metallurgical and Materials Engineering (2017)
Titanium dioxide (TiO2) nanostructures with different crystal structures and various morphologies were synthesized by hydrothermal process to utilize them in photocatalytic and photovoltaic applications. The investigations were conducted in three different sets of systematic experimental studies. The first set of experiments was based on the synthesis of TiO2 nanostructures in the presence of strong sodium hydroxide (NaOH) catalyzer. Temperature and molarity of NaOH were kept constant while hydrothermal rea...
Solvent extraction of scandium from lateritic nickel- cobalt ores using different organic reagents
Ferizoglu, Ece; Kaya, Serap; Topkaya, Yavuz Ali (2016-09-28)
Scandium is the most important and strategic metal that can be recovered as a by-product from lateritic nickel-cobalt ores. In this research, different extractants were investigated in order to extract scandium from a sulfate medium by a using a solvent extraction method. Generally, the organic extractants are classified as acidic, neutral and basic organophosphorus compounds. However, in solvent extraction of scandium, the acidic and neutral organophosphorus compounds are preferred due to their higher extr...
Catalytic Role of Pyrite on Hydrodesulfurization of Lignite and Asphaltite
Halvaci, Veysi; Kanca, Arzu; Üner, Deniz (2016-04-20)
Pyrite, FeS2 , naturally present in solid fuels can act as catalysts during hydrogenation processes. In general, metal sulfide catalysts are used as hydrogenation and hydrodesulfurization processes of petroleum fractions. The defects in crystal lattice were considered as the responsible parts of catalytic activity. Therefore, the presence of metal sulfide active sites in the structure increases the process efficiency. Since pyrite is a metal sulfide present in the coal structure, Guin et al. reported a high...
Experimental and computational models for simulating sound propagation and acoustic source localization within the lungs
Serhan, Açıkgöz; Özer, Mehmet Bülent; Thomas J, Royston; Hanson A, Mansy; Sandler, Rıchard H (2006-11-10)
An acoustic boundary element (BE) model for porous compliant material like the lung parenchyma is developed and validated theoretically and experimentally. This BE model is coupled with a source localization algorithm to predict the position of an acoustic source within a lung phantom. The BE model is also coupled with a finite element (FE) model to simulate the surrounding shell-like chest wall. Experimental studies validate the BE-based source localization algorithm and show that the same algorithm fails ...
Citation Formats
M. Z. Çamur, “EMPIRICAL SOLUTION MODEL FOR ALKALIC TO THOLEIITIC BASIC MAGMAS,” JOURNAL OF PETROLOGY, pp. 497–514, 1995, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36034.