Titlebook: Early Organic Evolution; Implications for Min Manfred Schidlowski (Chairman),Stjepko Golubic,Phi Book 1992 Springer-Verlag Berlin Heidelber

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Foment

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Mantle Carbon: Concentration, Mode of Occurrence, and Isotopic Compositioneen —15 and — 19%o. The weighted mean of the distribution is — 7%o. The δ.C frequency distribution of carbonatite carbonates, a second major mantle carbon sample, shows very limited variability, is Gaussian, has a mean of — 5.4%o, and is distinct from that of diamonds. In comparison, the weighted me

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Precambrian Petroleum: A Decade of Changing Perceptionscates that eukaryotic algae became significant kerogen precursors at least 1.7 Ga ago. Along the southeastern margin of the Canadian Shield Aphebian black argillites (or, at Elliot Lake and Blind River, stratiform uraniferous kerogen layers in the Matinenda Formation) were probable sources for wides

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Paleontology and Biogeochemical Research: A Powerful Synergy isolates, and their host rocks, is now gaining momentum and must continue. We illustrate the successful application of this technique to determine the probable paleobiology of the microfossil . Zalessky 1917, and show it is the major source for certain Ordovician oils throughout many parts of the w

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An Assessment of the Precambrian/Cambrian Transition Events on the Basis of Carbon Isotope Records