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Browsing ELibrary by Title
Now showing items 3053-3072 of 21934
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(1999)The commonly used expression of the closure temperature, TC, of a diffusing species in a mineral, as derived by M.H. Dodson [Contrib. Mineral. Petrol. 40 (1973) 259-264], is applicable only to systems which have undergone ...
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(2004)The process of diffusion of fluid in porous media and biological membranes has usually been modelled with Darcy's constitutive equation, which states that the flux is proportional to the pressure gradient. However, when ...
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(1996)Self diffusion coefficients of calcium (DCa), aluminum (DAl), silicon (DSi), and oxygen (DO) were measured in molten CaO-Al2O3-SiO2 at 1500oC and 1 GPa over a range of melt compositions, using the isotope tracer method. ...
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(1996)Chemical diffusion profiles in molten CaO-Al2O3-SiO2 have been measured over a large range of compositions at 1500°C and 1 GPa. The diffusion profiles have been inverted for effective binary diffusion coefficients (EBDCs) ...
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(1997)Empirical models for multicomponent diffusion in an isotropic fluid were derived by splitting the component's dispersion velocity into two parts: (a) an intrinsic velocity which is proportional to each component's ...
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(2001)Interdiffusion coefficients of Al + Al vs. Mg + Si in the gehlenite–åkermanite system of melilite were determined by coupled annealing of synthesized end-member single crystals. The observed diffusion coefficients for a ...
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(1997)Diffusion coefficients of cations, Ni, Co, Mn, Ca, Sr, and Ba, which are possibly in divalent state, and Fe in synthetic single crystals of gehlenite (Ca2Al2SiO7), which is one of the endmembers of melilite, were determined ...
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(2003)Despite its low abundance in most rocks, zircon is extraordinarily useful in interpreting crustal histories. The importance of U-Th-Pb isotopic dating of zircon is well and long established (Davis et al., this volume; ...
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(2006)We have determined the diffusion coefficient of Cr in olivine as function of temperature, oxygen fugacity (fO2), and crystallographic orientation and used these data to develop a quantitative understanding of the resetting ...
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DIFFUSION KINETICS OF FE2+ AND MG IN ALUMINOUS SPINEL - EXPERIMENTAL DETERMINATION AND APPLICATIONS (2002)The diffusion coefficients of Fe2+ and Mg in aluminous spinel at ~20 kb, 950 to 1325°C, and at 30 kb, 1125°C have been determined via diffusion couple experiments and numerical modeling of the induced diffusion profiles. ...
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(2005)A natural quartz sample free of mineral and fluid inclusions was irradiated with a 200 MeV proton beam to produce spallogenic 21Ne, 3He and 4He. Temperature-dependent diffusivities of these three nuclides were then determined ...
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(2000)A mechanistic diffusion model for Sr in water-saturated clay (illite and kaolinite) is elaborated based on laboratory results. Both porewater and surface diffusion pathways are identified. Their relative importance is ...
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(1997)Layered coronas between two reactant minerals can, in many cases, be attributed to diffusion-controlled growth with local equilibrium. This paper clarifies and unifies the previous approaches of various authors to the ...
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(1995)Noble gas sorption experiments were performed in an internally heated pressure vessel at pressures of 1000 and 2500 bar and temperatures of 800°C on vitreous NaAlSi3O8 (albite) and NaAlSi2O6 (jadeite), and at 1200°C on ...
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DIFFUSION OF OSMIUM IN PYRRHOTITE AND PYRITE: IMPLICATIONS FOR CLOSURE OF THE RE-OS ISOTOPIC SYSTEM (2000)In order to better constrain the extent to which common sulfide minerals will retain their osmium isotopic composition subsequent to crystallization, we have conducted experiments to quantify the diffusion behavior of ...
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(1995)Self-diffusion of Si and tracer diffusion of Ga have been measured in an albitic melt, Na0.97Al0.99Si3.02O8, at 1 atmosphere between 1160 and 1558°C. Diffusion of these network-forming elements was studied for comparison ...
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(2000)We have measured the diffusivity of Sr in fluorphlogopite in a direction perpendicular to the basal planes (in the c direction). Annealing experiments were performed on single crystals, and most of them at ambient pressure. ...
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(2005)We have measured diffusion coefficients for P, Cr, Co, Ni, Cu, Ga, Ge, Ru, Pd, Ir, and Au in Fe metal from 1150 to 1400°C and at 1 bar and 10 kbar. Diffusion couples were prepared from high-purity Fe metal and metal from ...
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(1998)A mechanism of diffusion of isotopically tagged water in crystalline quartz by molecular diffusion and network exchange is compared to previous experiments. Three experimental factors are explained by this mechanism. (1) ...
Now showing items 3053-3072 of 21934