中文摘要：

在过去的十年，作为非传统的稳定的同位素之一，瞬间同位素很快发展了并且现在成为一个重要 geochemical 代理通过地质的历史跟踪 paleo 海洋、大气的进化。在这篇论文，在南部的中国的早寒武纪的形成被调查。结果显示那 δ ^97/95 早寒武纪的海水的瞬间价值可能比 1.4% 大，现代海洋接近那些的价值。在在从二节(在贵州的 Huangjiawan 和 Gezhongwu ) 的样品的瞬间同位素作文的变化是，这也被发现仔细与处于氧化还原作用条件的变化有关在沉积过程期间。把我们的结果与存在数据相结合，为通过地质的历史的海水瞬间同位素作文的进化的一个初步的模型被提供。它显示瞬间同位素的变化与大气的氧的进化通常一致。

英文摘要：

Over the past decade, as one of nontraditional stable isotopes, Mo isotope has developed rapidly and now become an important geochemical proxy to trace paleo-oceanic and atmospheric evolution through geological history. In this paper, Early Cambrian formations in southern China are investigated. The results indicate that δ 97/95Mo values of Early Cambrian seawater may have been larger than 1.4‰, values that are close to those of the modern ocean. It was also found that the variations in Mo isotope composition in samples from two sections （Huangjiawan and Gezhongwu in Guizhou） were closely related to changes in redox conditions during sedimentary processes. Combining our results with existing data, a preliminary model for the evolution of seawater Mo isotope composition through geological history was provided. It indicated that Mo isotopic variations were generally consistent with the evolution of atmospheric oxygen.