Showing papers in "Chemical Geology in 1974"

TL;DR: The relative and absolute concentrations of rare earth elements (REE) in authigenic and biogenic phases of deep-sea sediments are quite different as mentioned in this paper, and the distribution of REE in different masses of seawater strongly reflects their fractionation in sediments.

TL;DR: In this paper, the monocarboxylic acid fraction isolated from sediments of lakes differing in trophic status has been separated into n-alkanoic, branched/cyclic alkanoic and alkenoic components.

TL;DR: In this paper, the same authors found that peatmoss, a rich source of humic acid, was found to absorb significant quantities of various metal ions, including Zn and Fe.

TL;DR: In this paper, a method of preparation of homogeneous glass beads by direct fusion of bulk rock powders on an iridium-strip heater, and quantitative analysis of these glasses using an electron microprobe fitted with an Si(Li) detector, are described.

TL;DR: In this paper, the metal sorption is strongly suppressed by H+ but is only marginally influenced by the proportion of whole cells in the suspension and by complexing of metals in solution by the soluble organic matter.

TL;DR: The absolute concentrations of minor and trace elements vary considerably in plankton. as discussed by the authors showed that these elements show remarkably constant proportions vis a vis each other, whereas Ba, Cr, Cu, Ni, Zn and Ba are enriched relative to the shale abundances, as are also Ca, Mg, Na, K, and Sr.

TL;DR: In this article, powdered barite was added to each culture flask and flasks were purged with nitrogen, sealed and maintained at 20°C for 17 days, when the cultures were opened for analysis, hydrogen sulfide and iron sulfide had formed in all growing cultures.

TL;DR: In this article, a variety of authentic triterpenoid alkanes and steroid alkanes (steranes) were examined for reference purposes, by measurement of their Kovats indices on OV-101 and Dexsil 300 liquid phases, and by the recording of their low-resolution mass spectra by gc-ms.

TL;DR: In this paper, Nitrilotriacetic acid (NTA) and other synthetic complexing agents have been used as partial substitutes for polyphosphates in detergents, which could endanger the drinking-water supplies in areas using river and lake water.

TL;DR: In this paper, spring and stream water sulfates from mountainous, sparsely populated terrane in northern Italy display sulfur and oxygen isotope ratios scattered in the range 0 18 O ; − 7.5 34 S.

TL;DR: In this paper, it has been shown that amorphous hydroxides of Al, Fe, etc. are capable of coprecipitating silica even from very dilute solutions.

TL;DR: In this article, selective chemical separations of mineralogical constituents of limestones (Carboniferous limestones from the Isle of Man, and Lincolnshire limestone, Middle Jurassic, Lincolnshire) and dolomites using dilute acetic acid and hydrogen peroxide have been used and the fractions obtained analysed to evaluate mineralogical associations of trace and major elements.

TL;DR: In this article, electron spin resonance and infrared spectroscopic studies of lignite and ball clay from South Devon, and of extracts obtained from them by solvent fractionation, revealed similarities between corresponding organic components associated with both materials.

TL;DR: In this paper, a single Fourier series analysis of bituminous sediments from a section of the Upper Jurassic (Kimmeridgian) sediments in Great Britain, 20 m thick, has been performed.

TL;DR: The relative molecular-weight distribution of humic acids, fulvic acids and interstitial water, extracted from the surface sediments of Lakes Ontario and Erie, was determined by Sephadex gel filtration as mentioned in this paper.

TL;DR: In this paper, a number of problems associated with the geochemical application of instrumental neutron activation analysis are discussed, with particular emphasis on the problems of preparing and using multi-element standard solutions and/or those associated with accurate computer reduction of γ-spectral data.

TL;DR: In this article, the separation of surface and sub-surface sediment samples from the southwestern Barents Sea is described and the major and minor elements within the different grain-size fractions of the sediment and between detrital and non-detrital phases demonstrate that the clay chemistry of oxic shelf sediments is terrigenous in origin.

TL;DR: In this paper, delayed neutron measurements of U and Th in three meteorites yield the following values: Bruderheim U (ppb) Th(ppb), Peace River 11.8 ± 0.7 96 ± 46 Stannern 220 ± 6 563 ± 190

TL;DR: In this paper, the relationship between silver dissolution and the dissolution of manganese and/or iron was evaluated by linear and multiple regression analyses, and the highly significant correlation coefficient ( r = 0.913) between silver and MANG oxides suggests that manganESE oxides are the major control on the scavenging of silver in these stream sediments, whereas iron oxides only play a secondary role in this regard.

TL;DR: In this paper, peroxide-treated marine sediments were compared with uncoated clays and clays with heptadecanoic acid and anthracene, showing a three-fold increase in copper adsorption.

TL;DR: In this paper, two groups of rocks are distinguished in the Assab volcanic range (Afar) on the basis of their petrology: a typical alkaline suite with high Li, Ba, Rb, Sr, Th and U concentrations, and a subalkaline group may be related to a parental basalt characterized by low trace-element concentrations and intermediate in character between alkali and tholeiitic basalt.

TL;DR: In the Fig Tree and Onverwacht groups of South Africa, the organic carbon content of these cherts (0.02-1.58%) shows a considerable variation with a maximum abundance in the Onver Wacht group as mentioned in this paper.

TL;DR: In this paper, 80 ferromanganese nodules from a wide variety of marine and fresh-water environments have been analyzed by electron spin resonance spectroscopy and the purpose has been to gain information on the forms in which the major constituents of manganese nodule are present.

TL;DR: In this paper, Cadmium has been determined in a range of silicate rock standards using the stable isotope dilution technique incorporating solid source mass spectrometry. But the recommended values are, in general, lower than the previously reported data.

TL;DR: In this paper, a muscovite-biotite albite granite of Alijo-Sanfins, northern Portugal, was studied for both major and trace elements.

TL;DR: In this paper, X-ray diffractometry was used to identify calcite-dolomite veins in a light yellow marble outcrops in the Griesscharte, Tyrol, Austria/Italy, and their form and distribution were established by scanning electron microscopy.