Showing papers in "Chemical Geology in 1971"

TL;DR: In this paper, the chemical composition of the waters is studied in relation with the dynamics of weathering and the results of thermodynamics and geochemical balances in the studied waters are in good agreement with the data about the evolution of the studied regions.

TL;DR: In this article, it is shown that the API gravity of the original oil depends upon the source materials and environment from which it evolved, and it is also possible to recognize three processes which have drastically altered the composition of this original oil after it was pooled.

TL;DR: In this article, a massive escape of volatiles from the interior of the earth to its surface has been studied, and the mechanism and time of this event are inferred from the abundances and distribution of VOLATILITY in the atmosphere, hydrosphere and crust, and from meteorite studies, and geophysical and astronomical observations.

TL;DR: In this paper, a model has been devised which predicts silica solubility as a function of NaOH concentration in this three-phase, three-component system, and a reinterpretation of pre-existing quartz-solubility measurements in the SiO21bH2O1bAr system has yielded a value of 4.2 for the hydration number of the aqueous silica complex at 1,000 bars total pressure and 500°C.

TL;DR: In this paper, the atomic absorption determination of 18 elements in aluminosilicate minerals and marine sediments is accomplished after a single decomposition method using hydrofluoric acid and aqua regia.

TL;DR: Mullica River water contains on the average several p.p.m. iron and most of the precipitated iron hydroxide is swept out of Great Bay into the Atlantic Ocean by tidal currents as mentioned in this paper.

TL;DR: This work has demonstrated the conversion of a labelled biolipid into hydrocarbons, some of which are widespread in ancient sediments and crude oils, and allowed the use of an organic-rich shale.

TL;DR: In this article, a column chromatographic technique with different grades of Sephadex gels was used to fraction Humic acids on the basis of molecular weight ranges, and the major oxygen-containing functional groups were concentrated on the low molecular weight fractions.

TL;DR: In this paper, a lava series from the 1959 Kilauea Iki eruption of Hawaii has a compositional range of 7.0 to 19.0% MgO which has already been shown to be due to olivine fractionation only.

TL;DR: In this paper, experiments on the polymerization of the L- and D-optical isomers of aspartic acid and serine using kaolinite as a catalyst were conducted.

TL;DR: In this article, basic nitrogenous compounds isolated from extracts of Green River Formation oil shale were analyzed and the major homologous constituents found were the compositional types - namely, quinolines, tetrahydrequinolsines with minor amounts of pyridines and indoles series and traces of more aromatized nitrogen compounds.

TL;DR: In this article, the trace element content of two laterite profiles on serpentinite has been investigated and it was shown that the majority of the trace elements studied such as Cr, Sc, Ga, Ge, V, Ni, Co, Mn, S, Zr, Ag, Pt, Pd, Pb, Cu and Zn have become concentrated with regard to the values of these elements in the parent rocks.

TL;DR: In this paper, the results of experiments relating to the distribution of trace amounts of first row transition metal cations between diopside crystals and coexisting silicate liquid in a synthetic hydrothermal silicate system were described.

TL;DR: The stoichiometric stability constants for the stepwise formation of the mononuclear lead chloride species, PbCl2−nn (n= 1−4) have been calculated from the isothermal saturation curves of PbCL2 in three molal Na(Cl, ClO4) solutions as discussed by the authors.

TL;DR: In this paper, the pH of various saline solutions and their artificial equivalents was found to increase on dilution with distilled water, and the effect is confined to waters containing more than 1.2-1.5% dissolved solids, and is roughly proportional to the original salinity of the solution.

TL;DR: A new atomic absorption method of determining Rb in silicates without any prior chemical dissolution of samples is described in this article, where powdered sample mixed with NaCl is impregnated on an iron screw rod which is then introduced into an air-acetylene flame.

TL;DR: In this article, solvent extractable acidic constituents of oil shale from the Colorado Green River Formation were identified based on gas chromatographic and mass spectrometric data obtained for their respective methyl esters.

TL;DR: A series of mineralogical and chemical analyses for a sequence of sediments from the Four Fathom limestone to the base of the Great Limestone are presented in this article, where the variance of the data is controlled by four factors related to depositional processes and two related to diagenesis.

TL;DR: In this paper, the Mossbauer parameters of a number of glasses in the system Na2OFeOSiO2 were determined in terms of liquid structure, and it was found that Fe2+ occupied two types of octahedral sites: "A" sites and "B" sites.

TL;DR: The elongated Giuv Syenite (Aar-Massif, Switzerland) contains remarkably high amounts of thorium and uranium as discussed by the authors, despite the relatively small dimensions (6 × 0.5 km) of the syenite body.

TL;DR: In this paper, a study of the infra-red spectra which result from reacting fifteen organic materials (including monohydric and polyhydric alcohols, hydrocarbons amines and azo dyes) with samples of the clay minerals illite, chlorite, kaolinite and montmorillonite was made.

TL;DR: In this article, stable isotope dilution and atomic absorption spectrophotometry were used to determine the presence of zinc in a range of standard reference materials using ion exchange column to reduce the level of contaminating species.

TL;DR: Duchesne et al. as mentioned in this paper studied the evolution of the Sr/Ca ratio in plagioclases from the Bjerkrem-Sogndal massif (southwest Norway) and its evolution in fractional crystaMsation of plagioclasic magma.

TL;DR: In this article, the chemical and mineralogical composition of chamosite-siderite ironstones and less ferruginous sandy shales in the Middle Lias succession of northeast Yorkshire is described.

TL;DR: In this paper, chemical analysis and some trace elements of U.S. Geological Survey standard silicate rocks and of BR, GA and GH are reported; analyses are carried out with wet chemical techniques; atomic absorption spectrophotometry is used for trace and some minor and major elements (MnO, Na 2 O, K 2 O and MgO).

TL;DR: In this paper, the Fe1bC1bO1bS system was studied at temperatures of 75°-800°C and at pressures of approximately 1-2,500 atm.

TL;DR: In this paper, the solubility of PbS in 1.0 m and 3.0m NaCl-HC1H2O solutions saturated with H2S has been determined at 90°C.

TL;DR: The isotope composition of strontium leached with aqua regia from sediment samples of core 128P from the Atlantis II deep of the Red Sea appears to be very nearly constant between depths of 130 and 795 cm below the top of the core as mentioned in this paper.

TL;DR: In this article, an automatic scheme for the analysis of SiO 2, TiO 2, Al 2 O 3, Fe 2 O3, Na 2 O, K 2 O, P 2 O 5, CaO, MgO and MnO is described using a commercially available autoanalyser and an atomic absorption spectrophotometer.

TL;DR: Partial chemical analyses of eighteen biotite samples along with complete analyses of the respective host rocks were carried out on some metamorphic and granitic rocks of the area around Richughuta in the Palamau district of Bihar as mentioned in this paper.