【摘 要】
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The Ediacaran Shuram excursion (SE) is widely regarded as one of the largest carbon isotope (δ13C) negative excursions in Earth history,with carbonate δ13C values down to ca.-12‰ (VPDB) [1].This event has been reported in Ediacaran strata on a global scal
【机 构】
：
Equipe Géomicrobiologie,Institut de Physique du Globe de Paris (IPGP),Université de Paris,Paris 7500
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The Ediacaran Shuram excursion (SE) is widely regarded as one of the largest carbon isotope (δ13C) negative excursions in Earth history,with carbonate δ13C values down to ca.-12‰ (VPDB) [1].This event has been reported in Ediacaran strata on a global scale,and is closely associated with the earliest emergence of macro-scopic animal life in fossil record [2].Numerous hypotheses have been proposed to account for this profound carbon cycle anomaly,including both primary [2-7] and diagenetic [8-11] origins.Among all the published hypotheses,a common ground is the long-standing and fundamental assumption of a marine origin for the bedded carbonates that record the SE.
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