Showing papers in "Geochimica et Cosmochimica Acta in 1972"

TL;DR: In this article, the distribution of the major elements between vapor and solid has been calculated for a cooling gas of cosmic composition, assuming that high temperature condensates remain in equilibrium with the vapor, affecting the temperatures of appearance of successively less refractory phases.

TL;DR: In this article, the parabolic exchange kinetics of surface magnesium ions with hydrogen ions were investigated and it was shown that the amount of silicon and magnesium dissolved is proportional to t and congruent.

TL;DR: In this article, the distribution of trace and minor elements in iron meteorites has been analyzed and the distributions interpreted with the chemical groups defined by Wasson, and two fractionations have occurred, a primary event which established the bulk composition of each group and a secondary event which fractionated the elements within each group.

TL;DR: In this paper, the water chemistry data of the Amazon River were used for seasonal cycle sampling and a new calculation of 62 ppm for the mean dissolved salts concentration for South American rivers is 11 per cent lower than previous calculations.

TL;DR: In this article, it was shown that in general the observed partition coefficients for trace element distribution between phenocrysts and host lava are not equilibrium coefficients, as far as trace element partitioning is concerned is due to an imbalance between the rate of crystal growth and trace element diffusion in the lava and in the crystal.

TL;DR: The behavior of strontium during the replacement of aragonite by calcite, in a closed system between 40°C and 98°C, has been experimentally investigated as discussed by the authors.

TL;DR: In this paper, it was suggested that the diamonds formed in igneous events and that the inclusions they contain crystallized in equilibrium with liquid, while the peridotite xenoliths, in contrast, may represent assemblages formed after cooling and equilibration at a lower temperature, perhaps in a volatile-rich liquid or perhaps in the solid state.

TL;DR: Water and interstitial water from the reducing fjord of Saanich Inlet, British Columbia were analyzed for their major element composition, ammonia, phosphate and silica contents, and for stable isotope composition of sulfur and carbon species as discussed by the authors.

TL;DR: One cm 3 samples of thermal waters were analyzed mass spectrometrically for their dissolved He, Ne, Ar, Kr and Xe as mentioned in this paper, and the data showed: 1) the thermal waters studied originated from meteoric waters that entered the ground, 2) While they were in the ground (in periods up to 30,000 years ago according to C-14 dating) the average temperature in the region was rather close to the present one, i.e. around 19 ± 4° C.

TL;DR: In this paper, stepwise heating experiments on five carbonaceous chondrites: Alais, Ivuna, Orgueil, Cold Bokkeveld and Nogoya were presented.

TL;DR: In a recent study of the sediment of Saanich Inlet, several groups of organic compounds were isolated from the sediment, identified, their concentration quantitatively determined and where possible, the C13C12 isotope ratio determined as discussed by the authors.

TL;DR: In this paper, a suite of 101 surface waters was collected mainly during a three week period in the summer of 1969 and represents an instant in time during a period of average flow for most rivers in the basin.

TL;DR: In this article, a portion of the solubility isotherm for synthetic vivianite (Fe3(PO4)2·8H2O) in the three component system Fe3PO42-H3PO 4-H 2O has been determined at 25°C.

TL;DR: Sediment and interstitial water from four cores in Saanich Inlet were analyzed for total iron, manganese, nickel, cobalt, copper, molybdenum, zinc, lithium and strontium as discussed by the authors.

TL;DR: In this paper, the South Cascade Glacier area of the Northern Cascades is both intensive and extensive in chemical weathering, and pedogenic clay assemblages which vary according to bedrock mineralogy, distinctive water types which coexist with discrete bedrock types and the striking chemical transformation of water as it runs over bedrock.

TL;DR: The Murchison meteorite contains aliphatic and aromatic hydrocarbons similar to those made in static Fischer-Tropsch-type syntheses as discussed by the authors, which can account for most principal features of meteorite organic matter.

TL;DR: In this paper, the isotopic fractionation of sedimentary and igneous parent rocks has been studied and it was shown that the parent rock minerals in these soils do not undergo appreciable oxygen or hydrogen isotopic exchange with meteoric waters in the weathering environment.

TL;DR: In this article, the major trapped components in gas-rich meteorites and the LFB (lunar fines and breccia) were found to have the following isotopic compositions: 3 He 4 He (× 10 4 ) sol 20 Ne 22 Ne 21 Ne 22 NE 22 Ne 36 Ar 38 Ar Component B 3.9 ± 0.18 0.0335 ± 0.0015 5.37 ± 0, 0.12 Component C 4.1 ± 1.3 0.042 ± 0., 0.

TL;DR: Some eclogitic and ultrabasic inclusions, their separated minerals, host rocks, and related samples have been analyzed by mass-spectrometric isotope dilution for K, Rb, Sr, Ba and rare-earth elements (RE), and by other techniques for selected major elements as discussed by the authors.

TL;DR: In this article, a suite of 101 surface waters from the Mackenzie River drainage basin, Canada, was collected mainly during a 3-week period in the summer of 1969 and represents an instant in time during a period of average flow for most rivers in the basin.

TL;DR: The authors showed that the sphalerite-wurtzite inversion is not an invariant reaction at 1020°C, 1 atm but is a univariant function of fs2 and temperature.

TL;DR: In this paper, radiochemical neutron activation analysis for 18 achondrites and four terrestrial basalts (3 ocean ridge, 1 continental) was performed by radiochemical activation for Ag, Au, Bi, Br, Cd, Co, Cs, Cu, Ga, In, Ir, Rb, Se, Tl and Zn.

TL;DR: In this paper, during cruise #49 of the R/V Atlantis II to the Black Sea in March and April of 1969, samples of suspended matter were collected by filtration of 8 to 101.

TL;DR: In this article, the authors analyzed organic carbon, total and organic nitrogen, fixed ammonium and amino acid-N. The C/N ratios ranged from 7·1 to 16·9; C/organic N ratios varied from 9·4 to 18·5.

TL;DR: Carbon isotope ratios were determined for carbonates from the banded iron-formation of the Dales Gorge Member of the Brockman Iron Formation and from the Wittenoom and Duck Creek Dolomite Formations of the Hamersley Range area of Western Australia as discussed by the authors.

TL;DR: In this article, the relative abundance of minerals in marine evaporites is a complex function of the history of the enclosing basins, but their sequence, and the absence of many minerals typical of non-marine evaporites set rather interesting limits on possible excursions of the composition of sea water since late Precambrian time.

TL;DR: A humic acid, extracted from the Ah horizon of a Black Chernozem soil, was found to fix or strongly retain significant amounts of hydrophobic organic compounds as discussed by the authors.

TL;DR: In this article, the reaction rates of pure calcite and pure dolomite with 100% phosphoric acid were investigated and it was shown that for mixtures the particle size range should be limited to minimize the cross-contamination of evolved CO2 which is later analyzed for δO18.

TL;DR: In this article, four stations in the Dead Sea (representing two shallow oxidizing and two deep reducing environments) were analyzed and the total organic carbon content of the sediment ranged from 0.23 to 0.40 per cent.