Showing papers in "Chemical Geology in 1982"

TL;DR: In this article, the authors discuss the major limits on the accuracy, and even the validity, of fluid inclusion quantitative data and their interpretation in terms of fluid composition and density, and the practical implications of the general constraints (temperature, pressure, topology of the fluid systems) are envisaged.

TL;DR: The chemical and isotopic compositions of saline groundwaters and brines in the Canadian Shield are described in this article, showing that these waters are not simple evaporated seawater, sedimentary-basin brines, hydrothermal solutions, or residual ore-forming fluids.

TL;DR: In this paper, a particular expression of the phase rule is proposed, which takes into account the multiphaseconstant bulk volume-constant mass composition constraints in fluid inclusions, and the consequences of such an expression are of major importance in fluid inclusion studies.

TL;DR: In this paper, a calcite-depositing stream in the Pyrenees, south France, enabled the authors to study the equilibration of major components and carbon and oxygen isotopes during the formation of calcite and the degassing of CO2, and to examine the possible influence of aquatic flora on these processes.

TL;DR: In this paper, a triple-filament assembly for mass spectrometric isotope dilution analysis of rare-earth elements (REEs) is described, which eliminates the need for chemical separation of the REE into groups and provides reproducibility of Sm/Nd to ∼ 0.1% and of Eu/Eu★ to ∼ 1%.

TL;DR: In this paper, an unusual occurrence of juxtaposed glassy and clay-altered ash was sampled to estimate the degree and type of element mobility during alteration of glass to montmorillonite.

TL;DR: In this article, the distributions of the alkanes and aromatic steroid hydrocarbons of eleven oils and six shales from the Shengli oilfield (Zhanhua depression), have been examined by gas chromatography and gas chromalysis-mass spectrometry.

TL;DR: In this article, the sorption of strontium and cesium on some common Swedish igneous rocks (granite, gneiss and diabase) and eleven rock-forming and accessory minerals (quartz, orthoclase, biotite, muscovite, hornblende, magnetite, hematite, fluorite, calcite, apatite and serpentine) has been studied using batch techniques.

TL;DR: In this article, the SO 2−4 concentration of aqueous solutions in fluid inclusions is easily measured down to 2 · 10 −3 mol/kg H 2 O, using the Raman microprobe MOLE.

TL;DR: In this paper, it was shown that the formation of ferric oxide obeys the parabolic rate law at all values of temperature and relative humidity, and an undefined ferrous-ferric sulfate is formed as an intermediate in the oxidation of FeSO 4 to Fe(OH)(SO 4 )· x H 2 O.

TL;DR: In this article, the formation of hydrocarbon gases in agpaitic nepheline syenites is considered to reflect the fulfillment of three basic conditions: (1) low oxygen fugacities; (2) a wide temperature range of crystallization and a low-temperature solidus; and (3) retention of volatiles during crystallization.

TL;DR: In this paper, a representative collection of oil samples and Neogene rock samples from the Vienna Basin has been analyzed by organic geochemical methods and it has been concluded that the bulk of the oil found so far in the Vienna basin originated from pre-Tertiary sediments below the Neogene basin.

TL;DR: In this paper, three characterized basalts and an associated secondary smectite were used in comparative uranium and cesium sorption studies, and the sorption data were fitted to the Dubinin-Radushkevich (D-R) isotherm, and loading maxima and energy derived.

TL;DR: In this article, micro-thermometric data on inclusions in combination with electron microprobe analyses of associated solid phases are presented for a kyanite-bearing garnet granulite and a garnet-two-pyroxene granulites, both selected from the same locality.

TL;DR: In this paper, core samples of Devonian shales from five localities in the Appalachian basin have been analyzed chemically and mineralogically, and the results show that the major trace elements are similar; however, the minor constituents, organic C, S, phosphate and carbonate show ten-fold variations in amounts.

TL;DR: In this article, the authors studied sediments collected from an anaerobic estuarine mudflat and found that C 1 -C 4 hydrocarbons can be formed by low-temperature reactions, possibly mediated by microorganisms.

TL;DR: In this article, the major element chemistry of Paragominas bauxite is described in terms of oxides and hydroxides of Al, Si, Ti and Fe, bound mineralogically as gibbsite, kaolinite and hematite.

TL;DR: In this paper, the authors show that high concentrations of C15+ hydrocarbons are thermally stable to high temperatures (at least 300°C) in abnormally-pressured semi-closed systems over geologic time.

TL;DR: In this article, the state of radioactive equilibrium between 238 U, 235 U, and 232 Th and their short-lived daughterisotopes was studied in Atikokan, Ontario.

TL;DR: The average major-element compositions of clastic sedimentary rock assemblages (i.e. carbonates, evaporites and iron formations not considered) for various times in earth history are reported, based largely on the compilations of F.L. Schwab as discussed by the authors.

TL;DR: In this article, a sample of five sediment types from the Indian Ocean, all presenting a flat shale-normalized REE pattern has been divided into eight size fractions (> 35, 20-35, 5-20, 2-5, 1-2, 0.5-1; 0.2-0.5 and μ m).

TL;DR: In this paper, a T-X section of the N2CO2 binary system was generated from 23 inclusions from Triassic dolomites and evaporites (northern Tunisia).

TL;DR: In this paper, a speciation-solubility geochemical model, WATEQ2, was used to analyse geographically-diverse groundwater samples from the aquifers of the Columbia Plateau basalts in eastern Washington.

TL;DR: In this paper, gypsum and anhydrite from the Upper Miocene (Messinian) evaporites of the Mediterranean Basin were analyzed for their coprecipitated-ion compositions.

TL;DR: In this article, a multiphase fluid inclusions with two immiscible liquids, a gas and a solid phase at room temperature, was identified and an unambiguous identification of native sulphur daughter solid solid was obtained.

TL;DR: In this paper, a study of core samples from five boreholes in the Eye-Dashwa lakes pluton reveals several types and degrees of alteration, including chlorite and sericite.

TL;DR: In this paper, a parameter termed "diffusion radius, rD" has been developed which can be used to predict diffusion rates and contribute in comparing rock types in terms of their suitability for isolating nuclear fuel waste.

TL;DR: In this article, the problem of breaking or non-breaking of waves in a plane cylindrically or spherically symmetric flow of an ideal dissociating gas is studied.

TL;DR: In this paper, it was shown that the rate of release of a particular nuclide is a function of temperature and time, and that the leach rates obtained in this manner are at least an order of magnitude lower than leach rate derived from refluxing dynamic leach tests.

TL;DR: In this article, a micro-probe analysis of the metalliferous phase of the Galapagos mounds was carried out and the results indicated that the granules are composed of a single mineral of essentially constant composition, consistent with relatively uniform conditions of solution and composition during nontronite formation.