Mo isotopes in the Lower Cambrian formation of southern China and its implications on paleo-ocean environment
Mo isotopes in the Lower Cambrian formation of southern China and its implications on paleo-ocean environment
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中国南方下寒武统地层钼同位素及其对古海洋环境的意义
DOI：
10.1007/s11434-009-0446-2
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发表时间：
2009-09
期刊：
影响因子：
--
通讯作者：
Hu RuiZhong
中科院分区：
文献类型：
--
作者：
Wen HanJie;Zhang YuXu;Fan HaFeng;Hu RuiZhong
近十年来，钼同位素作为一种非传统的稳定同位素得到了迅速的发展，现已成为追踪地质历史中古海洋和大气演化的重要地球化学指标。本文对中国南部早寒武世地层进行了研究。结果表明，早寒武世海水的δ97/95Mo值可能大于1.4%，接近现代大洋的值。研究还发现，贵州黄家湾和葛中坞两个剖面样品中Mo同位素组成的变化与沉积过程中氧化还原条件的变化密切相关。结合已有资料，提出了海水钼同位素组成随地质历史演化的初步模式。结果表明，钼同位素变化与大气氧的演化过程基本一致。
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 δ97/95Mo 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.
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作者：
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DOI：
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