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地质论评  2007 

沉积环境细菌作用下的硫同位素分馏

Keywords: 细菌,硫同位素,还原作用,歧化作用,同位素分馏

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Abstract:

缺氧的沉积环境中存在大量的细菌,它们消耗硫的化合物为其新陈代谢提供能量,并导致硫的化合物被还原、氧化或(和)歧化。细菌的还原作用和歧化作用都能造成明显的硫同位素分馏。细菌硫酸盐还原造成的硫同位素分馏一般在4‰~46‰之间,平均为21‰;细菌参与的氧化作用所造成的硫同位素分馏很小,不到5‰;硫的中间价态物质(S0、S2O2-3和SO2-3)的歧化作用可以造成7‰~11‰的硫同位素分馏。主要依据实验研究和现代海洋观测获得的细菌还原和歧化作用的硫同位素分馏结果已经被用于解释古代沉积物中的硫同位素记录,成为研究地球历史上古海洋的化学演化的重要手段。

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