Showing papers on "Silicate minerals published in 1967"
TL;DR: Experimental rates of release and uptake permit the conclusion that the suspended solids carried into the oceans by streams are a major control of the concentration of silica in the ocean.
Abstract: Silicate minerals typical of those carried in the suspended load of streams release silica to silica-deficient sea water and abstract silica from silicaenriched sea water. Experimental rates of release and uptake permit the conclusion that the suspended solids carried into the oceans by streams are a major control of the concentration of silica in the ocean.
108 citations
TL;DR: In this paper, Gibbs et al. measured the distribution of cations and the detection of order-disorder phenomena in crystal structures provided a potential means of determining the temperature and pressure of formation of minerals.
Abstract: MEASUREMENTS of the distribution of cations and the detection of order-disorder phenomena in crystal structures provide a potential means of determining the temperature and pressure of formation of minerals. Such data have been obtained from crystal structure analyses of iron silicates by X-ray diffraction techniques (refs. 1–7 and Gibbs, G. V., and Burnham, C. W., personal communications). More rapid and direct techniques, such as infra-red spectroscopy8 and Mossbauer spectroscopy9,10, have since been used to detect cation ordering and to estimate site populations in suites of silicate minerals.
58 citations
TL;DR: Middle and far IR spectra of silicate minerals for remote sensing of lunar or planetary surface composition were used in this paper, where the authors proposed a method to obtain the spectral properties of the silicate mineral spectra.
Abstract: Middle and far IR spectra of silicate minerals for remote sensing of lunar or planetary surface composition
43 citations
TL;DR: In this article, the distribution of transition-metal ions between silicate minerals of metamorphic rocks has been analyzed from the standpoint of crystal field theory, and it is found that the order of distribution coefficients of ions of the same charge between two phases is partly determined by the relative crystal field stabilization energy (CFSE) of the ions.
36 citations
TL;DR: The Woodbine meteorite as mentioned in this paper is a fine octahedrite with numerous inclusions of silicate minerals, including kamacite, taenite, troilite, schreibersite, orthopyroxene (Fs6), diopside, olivine (Fa4), plagioclase (An9), and graphite.
Abstract: The Woodbine meteorite, ploughed up in Illinois in 1953, is a fine octahedrite with numerous inclusions of silicate minerals. The minerals present include kamacite, taenite, troilite, schreibersite, orthopyroxene (Fs6), diopside, olivine (Fa4), plagioclase (An9), and graphite. The chemical analysis is: Fe 73·06, Ni 9·08, Co 0·15, P 0·47, C 0·21, FeS 1·65, SiO2 8·55, TiO2 0·02, Al2O3 0·53, Cr2O3 0·03, FeO 0·49, MnO 0·03, MgO 5·19, CaO 0·34, Na2O 0·29, K2O 0·02, sum 100·11. Woodbine is compared with other meteorites of similar composition. The silicate material has chondritic composition, and is quite different from the silicate material of the mesosiderites, with which some of these meteorites have been classed.
36 citations
TL;DR: In this article, the electrical conductivity of olivine with tempera-ture and pressures up to those of the Moon's centre was analyzed and different models of the temperature distribution yield widely varying conductivity distributions.
Abstract: Analysis of the geomagnetic variations shows that in the Earth’s mantle at a depth of 700 km there is a rapid rise of electrical conductivity. Other considerations show that this rise flattens off in the lower mantle. The phenomenon is well explained by the semi-conduction of the silicate minerals. Experimental results on the electrical conductivity of olivine with temperature and pressures up to those of the Moon’s centre will be described. Different models of the temperature distribution yield widely varying conductivity distributions.
15 citations
TL;DR: In this article, a method is formulated so that quantitative estimates of the amount of iron in structurally different positions (site populations) can be rapidly obtained in silicate minerals, such as cummingtonite.
13 citations
TL;DR: The component of Titan yellow most reactive towards magnesium has been isolated from the acetone-extracted dye by adsorption chromatography on Sephadex G-10 as discussed by the authors.
Abstract: The component of Titan yellow most reactive towards magnesium has been isolated from the acetone-extracted dye by adsorption chromatography on Sephadex G–10. It is so reactive that it can be used at a concentration as small as 0·008 per cent., at which concentration the response is linear between 20 and 150 µg of magnesium.Values found for the magnesium content of silicate minerals agree with those obtained by spectrographic and gravimetric methods.
11 citations
01 Jan 1967
Abstract: Mossbauer line spectra analyzed for various tektites, pyroxenes, olivines and other natural and synthetic silicate minerals and glasses
6 citations