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本文提出了在加拿大Laurentian海槽中低价氧化沉积物的成岩阶段中有黄铁矿生成的证据。与盐沼沉积物中的黄铁矿生成作用相比,这种黄铁矿生成作用进行得很缓慢。原因可能是由于硫酸盐的还原速率较小。在圣劳伦斯沉积物中测得硫酸盐还原速率为2—2nmol/cm~3/天。我们观察到,砷和黄铁矿之间存在着非常密切的联系,表明元素砷是被Fe/As比为1000的黄铁矿捕获在其晶格中。在铁和砷的海洋地球化学研究中考虑砷和黄铁矿这一伴生关系是非常重要的。
This paper presents evidence of pyrite formation in diagenetic stages of low-grade oxidized deposits in the Laurentian trough, Canada. Compared with the pyrite formation in the salt marsh sediments, this pyrite formation proceeds slowly. The reason may be due to the smaller reduction rate of sulfate. The sulfate reduction rate was measured in the St. Lawrence sediments at 2-2 nmol / cm ~ 3 / day. We observe that there is a very close relationship between arsenic and pyrite, indicating that elemental arsenic is trapped in its lattice by pyrite with an Fe / As ratio of 1000. It is important to consider the relationship between arsenic and pyrite in marine geochemical studies of iron and arsenic.