【摘要】 作者对浙江省常山县三里亭北九家坞的上震旦统剖面的碳酸盐系统采集的54个样品,作了碳、氧稳定同位素的分析。其中δ¹³C除4个外几乎全为正值,平均值2.16％,这与前人提到过的文德期以δ¹³C负迁移为特征的结论不符。离散变为9.0。最大负峰值出现在剖面近中部的磷块岩层中,可能与海流状况的剧变有关。δ¹⁸O除最末两个为小的正值外,几乎全为负值。更多还原

【Abstract】 Total 54 samples were collected from the Upper Sinian Xifengsi Formation section at Jiujiawu north of Shanliting in Changshan County, Zhejiang Province. Result of carbon isotope measurement shows that majority of δ¹³C is positive, but 4 negative. Then, calculated average is 2.16‰ and the deviation is 9.0‰. This record is not coincident with the previous conclusion on negative migration of δ¹³O during the Vendian. The middle phosphaterich part of the section shows negative peak, indicating probably an abrupt turnover of oceanic current. The δ¹⁸O ratio is almost all negative, except for last two samples.更多还原