The effect of the minor elements P, S and C on the distribution coefficients of It, Ge, Ga, Au, Cu, and Cr between the solid and liquid phases in Fe-Ni alloys was measured experimentally. Distribution coefficients for It, Ga, and Au increase with increasing P content while the distribution coefficients for It, Ge, and Ni increase with increasing C and S contents. For Ge, the distribution coeffi...

The fractional latent heat of a crystallizing system is simply the latent heat of fusion divided by the total enthalpy. When plotted against temperature, this function displays robust pulses with the successive saturation of each incoming crystal phase. Each pulse endures for tens of degrees, corresponding to tens to hundreds of thousands of years in large magma bodies. From an original 1963 de...

The Neoproterozoic rocks of the Bir Madi area, south Eastern Desert, comprise a metagabbrodiorite complex (GDC) and a tonalite-granodiorite suite (TGrS). The GDC has a weak tholeiitic to strong calc-alkaline character and is made up of olivine gabbro, hornblende gabbro, diorite and monzodiorite. The olivine gabbro is characterized by abundance of augite and labradorite with pseudomorphic serpen...

L-Isoleucine was discovered in 1904 by Ehrlich (l), and its constitution established 3 years later (a) by degradation to d-isoamylamine and (b) by synthesis through the Strecker reaction with d-isovaleraldehyde (2). The synthetic product, however, appeared on fractional crystallization to be optically inhomogeneous, and Ehrlich attributed this to the presence in nearly equal parts of natural is...

Smith, D. R. and Leeman, W. P., 1993. The origin of Mount St. Helens andesites. J. Volcanol. Geotherm. Res., 55: 271-303. Mount St. Helens volcano has intermittently produced mainly dacitic products but occasionally erupted a more diverse suite of lavas including basalts and andesites. Petrogenetic relations between these magmas provide insight into the dynamics of the subjacent magma system. M...

in this paper, we prove the existence and uniqueness results to the random fractional functional differential equations under assumptions more general than the lipschitz type condition. moreover, the distance between exact solution and appropriate solution, and the existence extremal solution of the problem is also considered.

We have conducted an electron microprobe study of minor element distributions among spinels from two type B 1 calcium-aluminum-rich inclusions (CAIs): Allende TS-23 and Leoville 3537-2. We show that by maintaining the petrologic context (edge, middle, and center of the inclusion plus their host silicate phase), four populations of spinels are resolvable based on their minor element contents. On...

The Mont Shefford alkaline complex of southern Quebec contains mafic rocks and both silica-oversatwated and -undersaturated syenites. Chemical and isotopic studies examine the relationship of the various lithologies. Isotopic, major, and trace-element compositions are consistent with derivation of all Iithologies from a common mafic paren! some of which evolved to a syenitic itage by fractional...

Some workers have held that mid-ocean ridge basalts are fractionated from high pressure (15-30 kbar) picritic primary magmas whereas others have favored primary magmas generated at about 10 kbar with compositions close to those of mid-ocean ridge basalts. Of critical significance are presumed differences in composition between experimentally determined primary magmas and the least fractionated ...