Carbon content and carbonate <sup>13</sup>C abundances in the Early Precambrian Swaziland sediments of South Africa期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Carbon content and carbonate ¹³C abundances in the Early Precambrian Swaziland sediments of South Africa

Authors:	Bartholomew Nagy Steven M Kunen John E Zumberge Austin Long Carleton B Moore Charles F Lewis Carl R Anhaeusser Desmond A Pretorius

Institution:	1. Department of Geosciences, The University of Arizona, Tucson, Ariz. U.S.A.;2. Departments of Chemistry and Geology, Arizona State University, Tempe, Ariz. U.S.A.;3. Economic Geology Research Unit, University of the Witwatersrand, Johannesburg South Africa

Abstract:	Carbon content (0.02–0.68% organic), carbonate content (0–69.7%) and carbonate ¹³C abundances ( $^{?} 7.5?+2.3‰$ ) were obtained on samples from the Swaziland sediments of South Africa, which are among the oldest known sedimentary rocks on earth (> 3·10⁹ years old). The carbon chemistry of these sediments may serve as evidence for early life and/or for products of chemical evolution. The variation of organic and carbonate carbon concentrations in different sedimentary horizons seems to be controlled by differences in depositional and diagenetic histories. The carbonate δ ¹³C values did not vary significantly from the ordinary range of Phanerozoic limestone values.

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