Showing papers in "Geochimica et Cosmochimica Acta in 1953"

TL;DR: A number of marine water and fresh water samples were examined for the relative O18O16 ratio, and the variation of this ratio was determined to a precision of ± 1% as mentioned in this paper.

TL;DR: A survey of the variation of the ratio C13/C12 in nature can be found in this paper, where Urey and his co-workers used two complete feed systems with magnetic switching to determine small differences in isotope ratios between samples and a standard gas.

TL;DR: A mass spectrometric method for the accurate determination of the hydrogen-deuterium ratio has been developed as mentioned in this paper, which is possible to determine this ratio to ± 0.10% using material of "normal abundance" (i.e., 1 part D in 6700 parts H).

TL;DR: In this article, a study has been made of some 350 chemical analyses of stone meteorites available in the literature, and criteria have been applied in an attempt to select those which are more reliable.

TL;DR: In this paper, the distribution of some of the commoner trace elements with respect to the major elements in various igneous rock series is discussed. But the present communication deals with certain calc-alkali igneous rocks series, namely, the rocks of the Southern California batholith, the lavas of Lassen Peak, Crater Lake, the Lesser Antilles, the Medicine Lake Highlands and the East Central Sierra Nevada.

TL;DR: In this paper, the authors carried out a systematic study of pyralspites (calcium-poor garnets) in ordinary pelitic metamorphic rocks of the Gosaisyo-Takanuki district.

TL;DR: In this article, the ionic approach is used for interpreting properties of metal-nonmetal compounds irrespective of whether the bonds are dominantly covalent or dominantly ionic.

TL;DR: In this article, a method for determination of free silica by the method proposed made possible the derivation of logical formulas for several specimens of montmorillonites for which the formulas could not be derived from the analyses alone.

TL;DR: In this article, a chemisch-analytische Methode zur Chlor-and Brombestimmung in Gesteinen beschrieben is given, in which the Chlor and Brom are found in hydroxylhaltige Minerale an Stelle des OH-Ions eingebaut.

TL;DR: The Cold Bokevelt meteorite as discussed by the authors contained over 1% extractable organic substances, including complex organic acids and organic chlorine, an element which has not been so far detected within any of the terrestrial bitumens.

TL;DR: The sulphur isotope content of marine sulphide and sulphate deposits, as found in limestone and shales covering a wide range of geological ages, has been investigated in this article.

TL;DR: The role of minor elements in the rocks, minerals and clays in relation to the fate of the major elements is discussed in this article, where the Cornish rocks (i) adamellite, (ii) granodiorite-gneiss, (iii) gabbro, (iv) hornblende-schist and (v) serpentine) are described together with their weathering products.

TL;DR: The isotopic constitution of silicon in minerals and rocks has been examined in this paper, showing that the distribution of the silicon isotopes is similar to that of oxygen isotopes reported by Silverman; some exceptions are noted.

TL;DR: Quantitative spectrochemical determinations of Li, Sc, Sr, Ba and Zr in 21 specimens of chondrite, 7 other silicate meteorites and 13 ultramafic rocks are presented and discussed in this article.

TL;DR: In this paper, ten monazites from widely scattered localities have been analyzed for La, Ce, Pr, Nd, Sm, Gd, Y and Th by means of a combined chemical and emission spectrographic method.

TL;DR: In this article, a spectrochemical method for the determination down to 10 −4% Zn in numerous rocks and minerals has been developed by means of fractionated distillation, which confirms the figures given by Clarke-Washington (1924) (0.004%Zn) and the unpublished results by V.M. Goldschmidt (1938) (≤ 0,004%

TL;DR: In this article, the authors calculated the helium content of a meteorite as a function of radial distance and showed that the meteorite with the highest known helium content has a (cosmic-ray flux) × (time) product about three times the present day flux in neighbourhood of earth's orbit.

TL;DR: In this paper, the results of a series of tests of a granite and a diabase were compared with a synthetic glass of the proportions found in granite, and the results showed that relative error varies inversely with concentration of the constituent (e.g. 0.1% for SiO2, 10% for P2O5).

TL;DR: In this article, a diffusion constant of (1.5 ± 1) × 10−19cm2/sec for argon in potassium chloride was found, leading to an age of (21 ± 3) × 106α for the lower oligocene.

TL;DR: Analyses for trace elements of a series of Hawaiian lavas from olivine basalt to trachyte are given and comparisons made with data from the Skaergaard intrusion, East Greenland.

TL;DR: In this article, three series of coal samples representing Pliocene, Wealden, and Carboniferous have been investigated and various factors are briefly discussed in order to explain the observed isotope ratios.

TL;DR: In this paper, a method for the isolation of radon and thorium from 10 to 100 g samples of iron meteorites was described, and the concentrations of these elements were of the order of 10 −8 g per g of meteorite.

TL;DR: In this paper, the following elements (Ni, Co, V, Cr, Cu, Ag, Pb, Sc, Zr, La, Ga, Sr, Ba, Li, Rb and K) have been determined quantitatively in 59 specimens of Ontario diabase from representative areas and in 3 specimens of Duluth gabbro, using spectrochemical.

TL;DR: The experimental technique for the determination of helium in iron meteorites is described in detail in this article, and results are tabulated, and a short discussion of their reliability and significance is given.

TL;DR: In this article, the occurrence of indium in sulphide minerals, largely of Australian origin, with a view to determining 1. (a) how traces have been partitioned between primary sulphides; 2. (b) the influence of temperature etc. in partition equilibria; and 3. (c) the subsequent behaviour of Indium in unmixing processes and secondary mineral formation.

TL;DR: In this article, the authors reviewed the method employed to convert the oxygen of silicate minerals and rocks into carbon monoxide and sketches of the apparatus used are given, showing that during the thermal reaction fractionation of the oxygen isotopes might occur.

TL;DR: In this paper, the authors used spectrochemical determinations of potassium in 50 specimens of ultramafic rock to confirm the preliminary observation (Ahrens, Pinson and Kearns, 1952) that the abundance of potassium is much lower than has usually been assumed.

TL;DR: In this article, Houtermans proposed the RaD method for the determination of the chemical age of uranium minerals, which consists in the measurement of Pb/U, from the ratio RaD/Pb. The conditions under which the method is applicable and the ways of measuring RaD, are discussed.

TL;DR: In this paper, a meteorite shower was observed near Guidder in the Cameroons and two stones were recovered and presented to the Natural History Museum at Paris, the results of microscopic examinations of thin sections, and chemical analyses of the silicons and metallic phases are given.