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By G. D. Hobson, G. C. Speers

Advances in natural Geochemistry is a suite of complaints offered on the 3rd overseas Congress on natural Geochemistry held in London on September 26-28, 1966. The papers discover advances in natural geochemistry and canopy a variety of subject matters, from carbon isotope diversifications in marine sediments to hydrogen isotopic fractionation of water passing via timber. Correlation difficulties between crude oils and the starting place of hint steel enrichment in bituminous shales also are discussed.
Comprised of 34 chapters, this quantity starts by way of offering the result of a carbon isotope examine on methane from German coal deposits, by means of an research of the importance of carbon isotope adaptations in marine sediments. next chapters take care of the geochemical features of the incidence of porphyrins in mineral oils and rocks in West Venezuela; pentacyclic triterpanes from petroleum; geochemical prospecting for petroleum; and the geochemical importance of pore fluid in shales. The nitrogenous parts of deep-sea sediments also are thought of, besides alterations of standard fatty acids in sediments and thermal alteration of natural subject in sediments.
This publication might be of curiosity to natural chemists and geochemists.

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Marine Geology, 2, 173-185. Sackett, W. M. and Thompson, R. R. (1963) Isotopic organic carbon composition of recent continental derived clastic sediments of eastern gulf coast, Gulf of Mexico. Bull. Amer. Assoc. Petrol. Geol. 47, 525-528. Sackett, W. , Eckelmann, W. , Bender, M. andBe, A. W . H. (1965) Temperature dependence of carbon isotope composition in marine plankton and sediments. Science, 148, 235-237. Sackett, W. M. and Moore, W. S. (1967) Isotopic variations of dissolved inorganic carbon, in press.

5. Craig (1953) reports a range of —10-4 to — 28·4%υ for these gases, and believes that they have isotopically equilibrated with heavy C 0 2 at elevated temperatures. The isotopically light Quaternary gases are in general marsh and glacial till gases produced by bacterial processes. Colombo et al. (1964) suggest that the chemical and isotopic data for the many Italian natural gases of Tertiary age, shown in Fig. 5, "are consistent with either of the following alternative + Quaternary ΔΒ ma m-m Tertiary • Pliocene Miocene *Cl • t · · • «*) · Oligocène Eocene o Paleocene Cretaceous o .

Subsequently the sample was combusted at a temperature of around 900° C, and the generated gases were recycled via an electrically operated Toepler pump in order to convert all the carbon monoxide to carbon dioxide. The C 0 2 was passed over hot (500° C) manganese dioxide and copper to remove combinations of sulfur and nitrogen oxides, after the method of Sackett and Thompson (1963). Subsequently the purified C 0 2 was analyzed in a Nier— McKinney type mass spectrometer with the results being reported as per mil deviations (<5C13) from the ratio of a standard material as follows: _ (C»/C" Sample-C»/C» Standard) dC (in/oo)C « / C " Standard X 1 ° W The standard was National Bureau of Standards Tentative Isotope Reference Sample No.

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